שאלות בפיסיקה
The acceleration of a body is zero. Which of the following statements is TRUE?
" The kinetic energy of the object is constant in time."
Which statement is TRUE for potential energy?
" The product of mass, gravitational acceleration and height."
Which one of the following defines force?
" The product of the mass and the acceleration of the body."
According to Newton's third law...
" action and reaction forces always act on different bodies."
Work...
" has a magnitude that depends on the angle between the direction of the displacement of the object and the force."
What is the SI unit of linear momentum?
" kilogram ∙ metre ∕ second"
A cart moves along a straight pathway on a level surface with low friction, under the effect of a force which makes an angle α with the surface. The work done by the supporting ('normal') force on the cart is...
" zero, because the angle between the force and the displacement is 90°."
Which one of the following statements has an affect on the magnitude of the resonance?
"any of them
Blood flows with a speed of 23 cm/s in the aorta having a cross sectional area of 4,5 cm². How large is the speed of the blood flow in the capillary system, which has a total cross sectional area of 4000 cm²?
0.26 mm/s
560 Hz = ...
0.56 kHz
the hight of an average adult was measured to be 175 cm. the absolute error was 1cm. What is the relative error of the measurement?
0.57%
The mass of an unloaded car is 800 kg. The body of the car will sink 6 cm after getting in 5 persons of total mass of 500 kg. How much is the time of period of vibration of the unloaded car?
0.62 s
The mass of an unloaded car is 1000 kg. The body of the car will sink 6 cm after getting in 5 persons of total mass of 500 kg. How much is the time of period of vibration of the unloaded car?
0.69 s
p0= 0.85 pE = 0.5. kappa statistics?
0.7
p0= 0.90 pE = 0.5. kappa statistics?
0.8
in a survival study, the probability of interval survival is 0.99 in the first year, then 0.98, 0.97, 0.96 and 0.95 in every year respectivly in the next 4 years. Calculate the 5- year survival probability.
0.858
what is the body surface area of a man with mass of 70 kg based on a sphere approximation?
0.8m2
when tossing two coins, what is the probability of tossing two heads?
04.Jan
calculate the varience of the small sample X (3;0;4;3;0)
05.Mar
threshold of hearing at 1000 Hz for average youth pupolation is
0dB
Which formula defines the period? (π ≈ 3.14)
1 / frequency
Which one of the following equations is CORRECT?
1 pA · 1 ms = 1 fC
how many C would the body temperature of a 12 kg child with fever decreases if the heat transferred for the cooling bath is 75 kilojoules
1,49
The upper frequency limit of human hearing is 0.02 MHz. Assuming a speed of wave of 330 m/s, how many centimetres is the wavelength of this tone?
1,65
14kg kid coolin bath 110 kj (specific heat 4190 J/KgxCelcius
1,87
The mechanical role of the tiny bones in the human middle ear is approximated by the following model: a point mass of m = 2 mg is anchored to the ear drum and to the oval window by two springs of directional forces k1 = 72 N/m and k2 = 7.2 N/m, respectively. How much is the (self) frequency of this system?
1.0 kHz
By how many °C will the body temperature of a 14.5-kg child with fever decrease if the heat transferred to the cooling bath is 70 kJ? (The specific heat of the human body is 4190 J/(kg·°C).)
1.15
The density of air is 1.29 g/l. Express this value in SI units.
1.29 kg/m3
The waist circumference of an average adult man is 90 cm. The relative error of the measurement was 1.5%. What is the absolute error of the measurement?
1.35 cm
in a survival analysis study, the average disease-free period was 3.5 years with SE = 1.0. calculate the 95% confidence interval for the population
1.54 - 5.46
By how many °C will the body temperature of a 70-kg man with fever decrease if the heat transferred to the cooling bath is 500 kJ? (c = 4.19 kJ/(kg·°C) )
1.7 °C
calculate the standard deviation of the small sample X (3,0,4,3,0)
1.87
when throwing a regular dice, what is the probability of roling a number less than 4
1/2
when rolling a dice, what is the probability of rolling a number greater than 5?
1/6
How can we obtain the optical power? (f - focal distance, p - object distance, q - image distance)
1/f
Which one of the following is the lensmaker's equation? (f - focal length, n - relative refractive index, R₁ and R₂ - radii of the lens surfaces)
1/f = (n - 1) · (1/R₁ + 1/R₂)
What does the lens equation state? (D - optical power, f - focal distance, p - object distance, q - image distance)
1/f = 1/q + 1/p
which one is the lensmakers equation
1/f=(n-1)x(1/R1 - 1/R2)
A converging lens creates a real image at a distance of 20 cm from the lens. The image has the same size as the object. How many diptres is the optical power of the lens?
10
Two identical containers are filled with hydrogen (H2) and nitrogen (N2) gas of the same mass at the same temperature. The pressure in the container filled with hydrogen is 140 kPa. What is the pressure in the other container? (Mhydrogen:Mnitrogen=1:14)
10 kPa
Three branches meet in a junction of a circuit. If 10 mA flows into the junction from the first branch and 20 mA flows out of the junction into the second branch, what is the magnitude and direction of the current in the third branch?
10 mA, into the junction
If an ion channel is open for 5 ms and 50 fC charge was transferred through it, the average current intensity is:
10 pA
the intensity of sound at the threshold of hearing at 1000Hz is:
10-12 W/m2
which term equivalent to 1 ns?
10-9s
100 N constant force is applied on a 10-kg body and moves it along a 10 m long path in the direction of the force for 10 seconds. The average power is:
100 W
50 N constant force is applied on a 5-kg body and moves it along a 20 m long path in the direction of the force for 10 seconds. The average power:
100 W
A sound wave propagates with frequency 500 Hz and wavelength 2 m in a solid body. How much is the speed of sound in that medium?
1000 m/s
Which term is equivalent with 1 µm?
1000 nm
a sampling rate of 1 kilohertz means that
1000 samples are taking in each second
Which term is equivalent to 1 mg?
1000 μg
A basketball player of 100 kg lifts his center of gravity by 1 m when jumping up. On sudden (inelastic) landing, he needs 1 cm path to completely decelerate his speed of arrival. Estimate the forces of damping (loading the vertebral column) on landing!
100000 N
If the intensity of the sound is 100 decibel, how many times larger this intesity compared to the hearing treshold?
1010
A middle-aged 70-kg woman with moderate physical activity has a daily energy demand of 2235 kcal (1 kcal = 4184 joule). How many watts of power uptake does this correspond to?
108
In 0.12 seconds, a jumper of 80 kg is completely braked by the ground from a speed of 5.2 m/s. How many joules of kinetic energy are consumed?
1081.6
what term is equivalent to 1 ns?
10^-9 s
express the area of 1 m2 in mm2
10^6
a sportsman holds a body of 10 kg in his hand so that his underarm is parallel with the ground and the body is 35cm away from his elbow joint. At least how many newtons should the flexor exert if the coresponding lever arm is 3 cm?
1144,5
if the mean arterial pressure is 85 mmHg and the diastolic pressure is 70 mmHg what is the value of the systolic pressure?
115 mmHg
10 healthy. mean 119 mmHg. SE= 0.664 mmHg find 95% a=0.05 t table - 2.26
117.5; 120.5
For a lens, the index of refraction is 1.5, the radii of curvature are 10 cm and 15 cm. What is the focal length of the lens?
12 cm
the threshold of pain is the maximum sound level that we are able to withstand without damage for short time. it's value is about
120 dB
An ultracentrifuge causes a uniform acceleration of 400 000 g (g ≈ 10 m/s²). Starting from rest, how large velocity (m/s) does a sedimented macromolecule acquire in 0.3 ms?
1200
convert the Pressure exerted by Mercury column of 1mm to other units
133.4 Pa
A body is released from rest to fall. What distance will it cover during the 2nd second of the movement? (g = 10 m/s2)
15 m
An object is falling down from rest. What is the distance covered in the SECOND second of the movement? (g = 10 m/s2)
15 m
A basketball player of 100 kg lifts his center of gravity by 1.5 m when jumping up. On sudden (inelastic) landing, he needs 1 cm path to completely decelerate his speed of arrival. Estimate the forces of damping (loading the vertebral column) on landing!
150000 N
The acceleration of a car is 4 m/s2. What will be the speed of this car after 4 seconds if the car starts from rest?
16 m/s
a sportsa man holds a body of 13 kg in his hand so that his underarm is parallel with the ground and the body is 32 cm away from his elbow joint. At least, how many newtons should the flexor exert if the corresponding lever arm is 3 cm?
1618,65
A sportsman holds a body of 17 kg in his hand so that his underarm is parallel with the ground and the body is 27 cm away from his elbow joint. At least how many newtons should the flexor exert if the corresponding lever arm is 2.7 cm? (g ≈ 10 m/s²)
1700
A tuning fork has a frequency of 560 Hz. How many microseconds is the period of its vibration?
1785,7
The heart pumps 5 l blood in the aorta having a cross sectional area of 4,5 cm². How large is the volumetric current density of the blood?
18.5 cm/s
What altitude is reached by a stone if it is trown up with the initial speed of 19,5 m/s? (g = 10 m/s2)
19,0 m
A stone is thrown up with an initial speed of 19.5 m/s from 0 level. What is the highest point of its path? (g = 10 m/s2)
19.0 m
Blood flows through an aorta segment with a cross-section of 3.7 cm² at a speed of 0.18 m/s. What will be the speed of the blood in cm/s if the cross section area is reduced to 3.4 cm²?
19.6
A 6-kg object moves towards the east. A constant force of 12 N is exerted on it pointed to west. The direction and magnitude of the acceleration is:
2 m/s2, west
the correlation coefficiant between two variables based on a sample of 32 observations is 0.28. we want to know if there is a linear realtionship between the variables (at the level of 5%). Determine the critical value.
2.042
By how many °C will the body temperature of a 10-kg child with fever decrease if the heat transferred to the cooling bath is 100 kJ? (c = 4.19 kJ/(kg·°C)
2.4 °C
100 N constant force is applied on a 5-kg body and moves it along a 3 m long path in the direction of the force for 5 seconds. The work done on the body is:
300 J
An air bubble forms in the blood of a patient. By what percentage is the volume of the bubble less during the systolic phase of 120 mmHg than during the diastolic phase of 80 mmHg?
33,3
The volume of a gas at a temperature of 100 °C and a pressure of 100 kPa is 500 cm3. How large is the volume of this gas at 0 °C, at the same pressure?
366 cm3
Which one of the following quantities is NOT an energy?
4 Ω∙A
the effect of a treatment of the blood pressure was examined. the blood pressure of 25 patient measured before and after the treatment. mean differences is 11. sd is 12. calculate the test statistics
4,58
In a summer training, the body of a 75-kg sportman evaporates 2 litres of water. How much heat is taken away? (L = 2.25·106 J/kg)
4.5·106 J
In a summer training, the body of a 75-kg sportman evaporates 2 litres water. How much heat is taken away? (L = 2.25·106 J/kg)
4.5·106 J
74 mmHg, 41 cm rise, 1060 Kg/m3 blood. 13600 Kg/m3
42,040
A spring stretches by 10 cm when a 60-N force acts on it. What is the magnitude of force exerted on the spring that would stretch it by 75 cm?
450 N
The sound intensity for the threshold of hearing is 10⁻¹² W/m². How many decibels is the sound level of a sound having an intensity of 6·10⁻⁸ W/m²?
47,78
There are two ohmic resistances of 1 Ω. What is the ratio of the resulting resistances if they are connected in serial, then in parallel?
4:1
The volume of a sphere with radius 'r' is...
4·r³·π ∕ 3
A patient's accommodation ability is being tested. His near point is 20 cm, and his far point is 300 m. How many diptres is his accommodation ability?
5
The output wavelength of a surgical laser is 10.6 micrometer. The energy of the pulse is 10J and it takes 2 microseconds. What is the power of a laser pulse?
5 MW
A current of 100 mA flows through a resistor if the voltage applied is 5 V. How large is the resistance of the resistor?
50 Ω
The sound of a tuning fork was investigated, and the duration of 10 periods of the tone was found to be 20 ms. What is the frequency of this tuning fork?
500 Hz
100 N force moves a body with a constant speed along a 10 meter long path. The vectors of the force and the velocity vectors form an angle of 60 degrees. The work done on the body is:
500 J
A sound wave propagates in a solid body with a frequency of 250 Hz and a wavelength of 2 m. What is the speed of sound in this medium?
500 m/s
the wrist blood pressure meter indicates a diastolic pressure of 67 mmHg when the arm is at given hight. By how many cm has the arm been lowerd then the meter indicates 109 mmHg? Density of blood is 1060kg/m3
53.88
sound intensity 10-12 W/m2 decibels of sound having intensity of 5x10-7 W/m2
56,99
The linear momentum of a 3-kg body is 6 N·s. How much is the kinetic energy of it?
6 J
Assume that the distance of the retina from the crystalline lens is 1.8 cm. What optical power (in dioptres) is required to form a sharp image of an object at a distance of 10m?
65,55
what is the body volume of a man with mass of 68kg?
66 liter
what is the body volume of a man with mass of 70kg?
67 liter
calculate the arterial pressure in mmHg if the diastolic pressure is 51 mmHg and the systolic is 102 mmHg
68
Without a physiological compensation, how large would be the pressure drop in the brain of a patient when he sits up from a lying position and therby his head raises by 90 cm? (The density of blood is 1040 kg/m³)
68.8 mmHg
calculate the edge length of a cube whose volume is 0.4 liter. Answer in cm
7,368
If the systolic blood pressure is 90 mmHg and the diastolic pressure is 60 mmHg, what is the value of the mean arterial pressure?
70 mmHg
if the systolic pressure is 90 mmHg and the diastolic pressure is 60 mmHg. What is the value of the mean arterial pressure?
70mmHg
the duration of a heart cycle of a patient is 0.85s. Determine the pulse rate
71
A spring stretches by 5 cm when a 50-N force acts on it. What is the magnitude of the force exerted on the spring that would stretch it by 75 cm?
750 N
calculate the mean arterial pressure in mmHg if the diastolic pressure is 61 mmHg and the systolic pressure is 108 mmHg
76,666
the mass of a woman is 79.7 kg. calculate the volume of the woman. Density 1030 kg/m3
77.37
The mechanical role of the tiny bones in the human middle ear is approximated by the following model: a point mass of m = 4 mg is anchored to the ear drum and to the oval window by two springs of directional forces k1 = 72 N/m and k2 = 28 N/m, respectively. How much is the (self) frequency of this system?
796 Hz
by how many mmHg will the systolic blood pressure indicated by a wrist blood pressure meter drom if the wrist is elevated by 11cm with respect to the level of the heart?
8,411
Two identical containers are filled with hydrogen gas (H2) and oxygen gas (O2) of the same mass at the same temperature. The pressure in the container filled with oxygen is 5 kPa. What is the pressure in the other container? (Mhydrogen:Moxygen=1:16)
80 kPa
the pressure meter shows 110 mmHg at the heart level. About what value will it show if we raise the arm by 40cm?
80 mmHg
The sound intensity of an engine is 80 dB. How large is the loudness of 3 such engines running together?
85 dB
The size of a bacterium cell is ca. 2 mm x 2 mm x 20 mm. How much is this in cm3?
8∙10-11
By how many millimetres of mercury will the systolic blood pressure indicated by a wrist blood pressure meter drop if the wrist is elevated by 13 cm with respect to the level of the heart? (The density of blood is 1040 kg/m³, the density of mercury is 13 600 kg/m³.)
9.9
The patient is just able to distinguish between the extreme points of an object of size 3.2 mm at a distance of 10 m. Approximately what percentage is the visual acuity of the patient?
91
in 0.17 seconds a jumper of 65kg completely Break by the ground from a speed of 5.3 m/s how many joules of kinetic energy is consumed
912,925
convert the pressure of 1cm h2o to other units the reasult is:
98.1 Pa
Blood flows through an aorta segment with a cross-section of 3.5 cm² at a speed of 0.20 m/s. What will be the speed of the blood in cm/s if the cross section area is reduced to 3.2 cm²?
???
Which property of the sound wave has the most influence on sensation of the tone quality (timbre, acustic colour) of sound?
???
what is spherical aberration?
???
approximately how large is the total refractive power of the healthy human eye?
????
Of the following situations, which one is IMPOSSIBLE?
A body having constant velocity and variable acceleration
What is heat radiation?
A heat exchange process that requires no medium and takes place via electromagnetic waves.
What is heat radiation?
A heat exchange process that requires no medium.
Which one of the following statements is CORRECT for energy?
A system possesses energy if it is able to do work under proper circumstances.
Which one of the following statements is CORRECT? (flow of liquids)
According to Bernoulli's law, the sum of the static, dynamic and hydrostatic pressures along a pipe is constant.
What is interference?
Amplification and reduction in wave amplitude at certain places due to the interaction of waves.
What is the condition of the beat and which statement is correct?
Beat is resulted in by the superposition of two unidirectional harmonic oscillations with frequencies very close to each other. The beat frequency is the difference of the original frequencies.
Which one of the following statement is FALSE? Diffusion
Charged particles can travel accross the membrane easier as neutral ones.
Which one of the following statements APPLIES to turbulence?
Critical velocity is directly proportional to the viscosity of the fluid.
Which statement is correct? (curves)
Curves resulted in by the superpositions of perpendicular harmonic oscillations are called Lissajous-curves.
What does the lens equation state? (In the formulae: D - optical power, f - focal distance, p - object distance, q - image distance.)
D = 1 ∕ q + 1 ∕ p
The concentration of the red blood cells increases towards the axis of the arterial blood vessel. What is the explanation for this phenomenon?
Decrease of static pressure towards the centre of the artery.
Regarding the Fourier-theorem, which statement is correct from the following list?
Each periodic function can be described by the sum of harmonic oscillations with appropriate amplitude and frequency.
Calculate the kinetic energy (Ek) of a 0.5-kg body moving with a constant speed of 2 m/s. With this initial velocity at the lowest point of a 45°and a 30° slope, how high can the body travel up (h30 and h45)? (The initial velocity of the body parallel to the ground of the slope, the friction is negligible, and the gravitational acceleration g = 10 m/s2.)
Ek = 1 J; h30 = 0,2 m, h45 = 0,2 m
Which one of the following laws is the first law of Newton (law of inertia)?
Every body persists in its state of being at rest or of moving uniformly straight forward, unless the body is acted upon by an external force.
Which one of the following statements is CORRECT? (thermal expansion)
For a given material, the ratio of the coefficient of volume expansion to that of linear thermal expansion is equal to approx. 3.
the mean free path of a particle ina medium is the greatest if the medium is
Gaseous
Which one of the following is the SI unit of the spring constant?
N/m
Which one of the followings is NOT a unit of pressure?
N/s (newton/second)
in a study, a diagnostic test detected 90 true positive, 10 false positive, 20 false negative and 80 true negative samples. What is the negetive predictice value (NPV) of this test?
NPV = 0.8
A body is suspended on a spring and performs harmonic oscillations. Which one of the following statements is CORRECT?
The factor of proportionality between displacement and retaining force is called the spring constant. its SI unit is the N/m
Estimate the body volume and the body surface area of an average student.
about 0.08 m³ and about 1.7 m²
Which one of the following quantities is NOT a scalar?
acceleration
considering a given ____ harmonic oscillation, which of the following parameters is not constant?
acceleration
according to newtons third law....
action and reaction forces are oppositlely directed but their mangitude is the same
which of the following statements is true for transport thorugh membranes?
active transport is a transport process that can also work against its concntration gradient, requires energy (ATP) and can be specifically blocked
which boundary has the highest contribution to the total reflective power of the eye?
air - cornea
Which one of the following statements is CORRECT? (Newton's law of friction)
The force required to move a fluid layer relative to other layers depends on the viscosity.
The image formed by a diverging lens is...
always reduced
Which parameter remains always constant during a process in a closed system?
amount of substance
Which one of the following quantities DOES NOT depend on temperature and is thereby NOT appropriate for temperature measurement?
amount of substance of a gas
What is the SI unit of the electric current?
amper
which parameters define harmonic signals unambiguously
amplitude frequency and phase
which one of the following statements is not true for anthropometric
anthropometry has only minor importance in evaluating risk Factors in metabolic syndromes obesity diabetes etc
if a 440 Hz in 510 Hz tuning fork are ringing together at which frequency can we see the peaks in the fourier spectrum
at 40 Hz and at 510 Hz
What is the minimum sampling rate required for the proper reconstruction of a signal from its sample sequence?
at least twice the frequency of the fastest signal component
Which statement is TRUE for the types of errors?
Systematic error can be eliminated by the careful planning of the measurement and the precise adjustment of the measuring device.
what happens during the pq interval of heart cycle
atrio-ventricular conduction
what is the meaning of the parameter of the regression line y=bx+a
b is the slope of the line (coefficient of regression) a is the constant term
which of the following cause a systematic error
before a body mass measurement of bathroom scale were not set to zero
which of the following statements is correct (blood pressure)
blood pressure is always measures at the level of the hart
Which one of the following is NOT an anthropometric measurement?
blood pressure measurement
in which of the following are both quantities continuous?
body mass and body hight
How was the pulse transmission signal derived from the cuff pressure?
by high-pass filtering
which variable is continuous?
concentration
beat can be observed when two tuning forks of somewhat different frequencies ring simulatinously. the fourier spectrum of such beat..
contains 2 narrow peaks corresponding to the two frequencies.
Which heat transport process carries energy and matter?
convection
in and undamped simple harmonic motion the displacement is a sine function of the time. which functions describe then the velocity of the motion
cosine function
What is the SI unit of the charge?
coulomb
A given force elongates a spring. The work done on the spring is:
directly proportional to the square of the force exerted on the spring
what are the charecteristics of a digital signal?
discrete in time and value
in simple harmonic motion, the restoring force must be propotional to the
displacment
which statement is true?
dissapative processes are irreversable
If we throw a ball in the air (vertical projectile motion), its acceleration is:
downward during both the ascent and the descent part of the motion
if you measure the blood presure by the korotkoff method...
during deflation, the pressure in the cuff then the korotkoff sounds stop is the diastolic blood pressure
if you measure the blood presure by the korotkoff method...
during deflation, we observe the maximum transmission of the pulse, the pressure in the cuff correspods to the mean arterial pressure
Which one of the following lines contain a physical quantity and a unit that do NOT match?
energy - watt
in everyday life, we often use the unil "kilowatt-hour" or kW-h (e.g. on electricity bills). This is a unit of..
energy or work
which statement is true?
energy transfer between a system and its surrounigs that is not heat transfer is called work.
which one of the following quantities is an extensive parameter?
enthalpy
If pressure and enthalpy are constants, the criteria for spontaneous process is...
entropy (S) increase; ΔS > 0
which one of the following is the assumption of the chi-aquare test?
expected frequencies should be large enough
which function describes the attenuation of the amplitude of a damped harmonic oscillation
exponential function
in summer, fans make the heat tolerable. What is the operation pronciple of fans?
fans remove the humid air surrounding the body, thereby intensifying vaporisation and the associated heat removal from the body.
which prefix designates a multiplier less than one?
femto-
which of the following is not true for normal distribution?
for all normal distribution the mean u equals 1 and the standard deviation a is 0.
which of the following methods is capable of identifying the Frequency components of a composite sound
fourier analysis
Which property of a sound wave determines principally the sensation of the pitch (height) of a sound?
frequency
Which property of the sound wave has the main influence on sensation of the pitch (height) of sound?
frequency
what is the primary role of the inner ear?
frequency analyser
which one of the following statements is not true (waves)
frequency is directly propotional to the period
if a 440 Hz and a 510 Hz sound forks can be hears at the same time, the beat has a
frequency of 70 Hz
What effects does NOT electric current have?
gravitational effect
A high diver jumps from a height of 10 m. If the air resistance is negligible, during the falling will decrease the diver's
gravitational potential energy
bugee jumping involves jumping from a tall structure while connected to a large elastic cord. The total energy of the system consistiong the cord and the jumper is composed of....
gravitational potentional energy, kinetic energy and elastic potential energy
in a fatigue manoeuvre EMG activity at half of the maximum Clones Force is typically
greater than half of the maximum EMG activity
which of the following types of motion involves an acceleration whose magnetude changes in time?
harmonic oscillation
The potential energy of a body performing harmonic oscillation...
has a minimum when the body is in the equilibrium position.
which of the following statements is not true? (heat and work)
heat energy and work are state functions
complete the following sentence: "thermodynamics deals with..."
heat exchange processes ?
which heat transfer process does not need a medium?
heat radiation
which one of the following is suitable to display the distribution of a continous variable?
histogram
which one of the following words denotes a solution who's the osmotic pressure is greater than that on the cytoplasm?
hypertonic
Which one of the following words characterizes a solution if its osmotic pressure is smaller that that of the cytoplasm?
hypotonic
which one of the following statements is true for temperature
if T and t denotes the temperature in Kelvin and degrees Celsius respectively the conversion is T = t - 273
which one of the following statements is true for linear momentum
if no forces acting on a body or the net force is zero the linear momentum of the body is constant in time
Which statement is TRUE on the basis of the Hagen-Poiseuille law?
The Hagen-Poiseuille law describes the flow of real fluids.
A body performs harmonic oscillations. Which one of the following statements is CORRECT?
The acceleration of the body changes in time.
Which one of the following statements is Fick's first law (definition of diffusion coefficient)?
The amount of material flowing through unit area over unit time is directly proportional to the concentration gradient. The factor of directly proportionality is called the diffusion coefficient.
which of the following sentences is correct for the paired sample t-test?
if p < a than the null hypothesis is to be rejected and the two expected values are said to be significantly different at the level of a
which of the following statments is correct for osmotic pressure
if the conentraion of the solution decreases, the osmotic pressure also decreases
which of the following remain constant during accommodation
image distance
Int he formulae below, the notations are: y - the position of the particle, A - amplitude, ω - angular frequency, φ - initial phase and t - time, λ - wavelength and c - velocity of wave propagation. Which one of the following statements is CORRECT?
The angular frequency is inversely proportional to the period.
Which one of the following statements is correct for an object released from rest (free fall)?
The average velocity during the first second of time is 4.9 m/s
which one of the following statement is correct? (mechanical waves)
in a mechanical wave the particles of the medium oscillate about an equilibrium position
which statement is not true for entropy?
in an isolated system, entropy always decreases
which one of the following statements is correct for turbulence
in case of an aneurism, laminar flow may be transformed into turbulent flow
which one of the following statements is not true for rods and cones in the human eye?
in low light conditions, photopic (cone) vision is active, while in high light conditions scoptic (rod) vision is active. Between the tow==wo domains either the cones or the rods are active (mesopic vision)
which statement is true for rodes and cones in the human eye?
in the human eye, rods contain one type of rhodopsin while cones contains three types of rhodopsin with different absorption bands. one for each type of cone
The volume of a gas is increased by a factor of three. How does its temperature change if the pressure remains constant?
increases by a factor of three
the effect of a treatment of the blood pressure was examined. the blood pressure of 2 groups were measured. not treated 23 patient. treated 25 patient. what is the appropriate test?
independent sample t test
pulse values derived from blood pressure should be rounded to..
integers (e.g 72.523 -> 73)
Which one of the following statements is FALSE for visual pigments?
The density of the rods is the largest in the fovea centralis.
What is pulse pressure?
The difference between the systolic and the diastolic blood pressure.
According to Coulomb's law, if the electrostatic force acting between two objects has decreased by 16 times from its original value, what has happened?
The distance between the objects increased by 4 times
Which one of the following statements is FALSE?
The divergence of the electrostatic field is zero.
if light is directed onto a CD disc, the thin parallel grooves cause coloured fringes to appear. Which wace phenomenon is reponsible for this findings?
interference
Which one of the following statements is NOT true? Temperature...
is a form of energy.
The total mechanical energy (the sum of the potential and kinetic energy) of a body performing harmonic oscillation...
is constant in time.
The electric field within a cavity inside a conducting material...
is zero, according to the Faraday-cage principle.
which statement is correct for presbyopia?
it can be corrected using a converging lens
Which one of the following statements APPLIES to the image formation of the human eyes?
The image on the retina is always real, inverted, and reduced.
Which one of the following statements APPLIES to the intensity of waves?
The intensity of a wave is the energy flowing over unit time through a surface A perpendicular to the direction of propagation.
Which one of the following statements is CORRECT? Diffusion
The larger is the mass of a particle, the smaller is the rate (velocity) of the diffusion.
Which of the following statements is TRUE for thermal expansion?
The length change in thermal expansion is directly proportional to the change in temperature.
Which statement is CORRECT for uniform circular motion?
The line of action of the velocity vector is always tangential to a point of the circular path.
A body performs harmonic oscillations. Which one of the following statements is CORRECT?
The magnitude of the retaining force is always directly proportional to the displacement of the body.
Which one of the following statements is TRUE for harmonic vibrations?
The magnitude of the retaining force of harmonic vibrations is directly proportional to the displacement from the equilibrium position, with opposite direction.
Choose the definition of pressure.
The ratio of the force to the area.
Which statement is TRUE for body mass index?
The range of normal BMI values is 18.5 - 24.99.
Which statement is TRUE on the basis of the ideal gas law?
The ratio of the pressure to the temperature of a gas is constant at constant volume.
Which one of the following statements is NOT true? (gas laws)
The ratio of the pressure to the volume of a gas is inversely proportional to the absolut temperature of the gas.
Which one of the following statements is CORRECT? Thermal expansion
The ratio of volume and linear thermal expansion coefficients is equal to 3.
Which one of the following statements on acoustic resistance (acoustic impedance) is TRUE?
The reflected portion of the energy of a perpendicularly incident wave is defined by R = (Z2-Z1)2 / (Z2+Z1)2 where Z is the acoustic resistance (impedance) of the medium.
Which one of the following statements APPLIES to the superposition of collinear harmonic vibrations having different frequencies?
The resulted vibration is non-harmonic.
Which one of the following statements is CORRECT? Currents
The resulting resistance of the resistors in parallel is the reciprocal value of the sum of the reciprocals of the individual resistances.
Two bodies of mass m are hung on the two arms of a balance scale, at x distance from the rotational axis for the right arm and 2x from the rotational axis for the left arm. Which one of the statements is TRUE? (g is the gravitational acceleration)
The scale will tilt to the left since the mg·(2x) torque for the right side is higher.
Which one of the followings reveals the velocity graphically?
The slope of the displacement vs. time graph.
thin strips of iron an zinc are revited together to form a bimetalic strip that bends when heated. such bimetallic strips can be used as a thermal swithces. the iron is on the outside of the bend because
it has a higher coefficient of a linear expansion
What is the SI unit of the refractive index?
it has no unit
Which statement is NOT correct for shortsightedness?
it is cased by the absence of visual pigments
which statement is not correct for short soghtedness?
it is caused by the absence of a visual pigment
how can we obtain the optical power in diopter from the focal length?
it is the reciprocal of the focal length measures in meters
how can you obtain the optical power in diopters from the focal length
it is the reciprocal of the focal lengths measured in metres
which of the following statments is true for the correlation coefficient?
it ranges between -1 and =1
which one of the following statements is not true for the light electromagnetic waves
it's Photon energy is inversely proportional to its frequency
Which one of the following statements is TRUE for green light (550 nm wavelength) propagating in air?
its frequency is approx. 5.45∙1014 1/s
Which one of the following SI prefixes represents 10³?
kilo-
Which one of the following units can be matched to the velocity?
km ∕ s
in the absence of a net force, a moving object will...
move with a constant velocity
Choose the SI unit of volumetric flow rate (volume current).
m³/s
Let p₀ indicate the threshold sound pressure of hearing. Which one of the following formulae gives the sound level in dB for a source of sound pressure p?
n = 20 · log(p ∕ p₀)
In which answer are the prefixes in an increasing order?
nano-, micro-, mega-, giga-
a bowling ball rolls along a straight pathway on a level surface with low friction. The work done by the force of the friction on the ball is?
negative because the ball decelerates
What is the SI unit of the force?
newton
5% level if the p=0.138 t=1.505 f=55
no because p=0.138 > 0.05
Which statement is TRUE on the basis of the equation of continuity?
The equation of continuity is a consequence of the conservation of mass.
Which statement is TRUE for wave parameters?
The speed of wave is directly proportional to the frequency.
Which statement is NOT true for the Laplace law?
The stress arising in the wall of a hollow organ decreases with increasing internal pressure.
Which one of the following statements APPLIES to deformations?
The stress emerging in solids is the ratio of the pulling force to the cross sectional area perpendicular to it.
What does Ohm's law state?
The voltage (or potential difference) between two points of a conductor is proportional to the current that flows through the conductor. The factor of proportionality is called resistance.
Which one of the following statements is TRUE for induced voltage?
The voltage induced in a coil is directly proportional to the rate of the change of flux.
Which statement is TRUE for waves?
The wavelength is the shortest distance between two points of the wave with the same phase.
Which one of the following statements is CORRECT? (waves)
The wavelength of electromagnetic waves is inversely proportional to the frequency.
Which one of the following statements is CORRECT for the photon energy?
The wavelength of ultraviolet radiation is less than that of infrared radiation.
Which statement is TRUE on the basis of Newton's law of friction?
This law describes the flow of real fluids regarding internal friction.
Which one of the following statements APPLIES to elastic deformations?
When applying external forces on elastic bodies, they become deformed, namely, they change their shape and volume.
Which one of the following statements APPLIES to the torque of frictionless systems?
When a force is applied on a body having an axis, the body will start to rotate except for the cases when the force is parallel or perpendicular to the axis.
Which one of the following statements APPLIES to forced vibrations?
When the system is exposed to a periodic external force, the oscillating body will make forced (induced) vibrations.
R denote measure X real measure. what is the absolute error
X-R
in which case should the null hypothesis of the chi-square test be accepted?
X2 < X2 table
8 males 6 females TBC group. 5 male 9 female control group. calculate test statistics.
X2 = 1.89
control and patient with CHD illnes were compared. There were 5 males and 9 females in the control group, and 11 males and 2 females in the CHD group. Is the ilness independent of sex? Calculate the test statistics.
X2 ~ 6.68
two stationary forks (350 Hz and 352 Hz) are struck simultaniously. We observe...
a beat with a frequency of 2 Hz
choose the correct defenition of the negative predictive value (NPV)
a conditional probability: a probability that someone really does not have the disease provided that the rest has given a negative reasult.
which of the following is the definition of specificity?
a conditional probability: the probability of a negative test reasult provides that the person is healty
which statement is true for heat convection?
a macroscopic material transport always takes place
choose the SI unit of latent heat
numerically, the heat required to change the phase of 1kg of a substance without a change in temerature
Acceleration is always in the direction:
of the net force
When is a body in equilibrium?
only if the net force and the sum of the torques acting on it are zero
which parameter of biopac uses to determine the difference of value between min and max within a range
p-p
control and patient with CHD illnes were compared. There were 5 males and 9 females in the control group, and 11 males and 2 females in the CHD group. Is the ilness independent of sex? use the level of significant a=0.05 and p=0.0097
p<0.05, so the difference is significant at 5 % level. the illness depend on sex.
the effect of a treatment of the blood pressure was examined. the blood pressure of 25 patient measured before and after. what is the apropriate test?
paired sample t test
Which one of the following is NOT an SI base unit?
pascal (Pa)
which of the following statments is not true for passage through membrane?
passive diffusion is a transport process that can be directed down the concentration gradient that requires energy (ATP) and can be specifically blocked.
what parameters are included in Laplace's law describing the tension in the wall of hollow organs?
pressure, radius, wall thickness
which of the following physical quantities can be the putput of a signal of a sensor?
pressure? voltage?
what are the measures of dispersion (variability)?
range, standard deviation and the interquartile range
which of the following properties applies to the image form on the retina?
real
which of the following properties applies to the image formes on the retina?
reduced and inverted
Which of the following properties applies to the image formed on the retina?
reduced and real
which one of the following describe correctly the image formed of an object position further from converging lens and twice the focal length?
reduced real and inverted
Heat capacity is the amount of heat ...
required to raise the temperature of a body by 1 K.
A person blows across the top of one arm of a U-tube partially filled with water. The water in that arm:
rises slightly
What is the SI base unit of time?
second
what preparatory steps required in the practical before the spirometry measurement
setting the zero level
which one of the following statements is false aural Sensation?
since the space is filled with liquid in the inner ear of not connected the round window is motionless
In undamped simple harmonic motion, the velocity is a cosine function of the time. Which function describes then the displacement of the body in time?
sine function
what is the appropriate test to compare the means of three independent normal populations?
single factor analysis of variance (ANOVA)
which one of the following statements is not true? (hearing)
sound propagates in air in the form of transverse waves
in a study of 100 patients a diagnostic test detected 90 true negative and 10 false positive test results. which measure of a diagnostic tests can be calculated from this finding?
specificity : 0.9
Which one of the following expressions yields the wavelength? (π ≈ 3.14)
speed of wave / frequency
which statement is correct for the first principle of thermodynamics
state that the change in the internal energy is equal to the sum of the work in the heat
Which one of the followings is NOT a deterministic signal?
stochastic
what do students t test examine?
students t teat examine the means of normal popularions
systolic blood pressure was measures in 5 patients before and after treatment. The mean difference is 6 mmhg, the standard error of the difference is SE 4.65 mmHg. Calculate the test statistics.
t = 6/4.65 = 1.29
Which one of the following quantities is NOT an extensive parameter?
temperature
which of the parameters influences the viscosity of a liquid the most significantly?
temperature
An object has a constant acceleration of 3 m/s2. The coordinate versus time graph for this object has a slope:
that increases with time
1 newton is the force:
that results in an acceleration of 1 m/s2 on a body of 1 kg
which of the following statements is true for Doppler effect
the Frequency shift depends on the speed of the source of the Observer and the speed of the sound in the medium
diffusion coefficiend (D) does not depend on...
the Rynolds number
a body performes harmonic oscillation. Which one of the following statements is correct?
the acceleration of the body changes over time
which v(t) graph of a body is a straight line with a positive slope
the acceleration of the bosy is constant in time
according to newton 3rd law
the action and the reaction force cannot balance ech other
what is the relationship between the actual body surface area and that yeilded by the sphere approximation?
the actual body surface area is always greater
Heat capacity is...
the amount of heat required to raise the temperature of a body by 1 K.
which statement is true for waves parameters?
the angular frequency is directly propotional to the frequency
Displacement can be obtained from:
the area under a velocity vs. time graph
which statement is true for the probability density function?
the area under its curve provides the probability that the variable falls into the given interval
which of the following is the null hypothesis of a paired t test
the average difference in the population is zero
an object moves in a circle at constant speed. the work done by the centripetal force iz zero beacuse...
the centripetal force is perpendicualr to the velocity
For plate capacitors it is TRUE, that...
the charge on the plates is proportional to the voltage.
which one of the following statements is true for coefficient of friction
the coefficient of friction depends on the properties of the contacting surfaces
which of the following determine the accommodation of the eye?
the crystalline lens
hydrostatic pressure depends on...
the density of fluid and the hight of the liquid column
which one of the following factors determined directly the hydrostatic pressure of a liquid column
the density of the fluid
during blood preusuure measurement with auscultaion, when you hear the last korotkoff sound, preassure in the cuff is
the diastolic pressure
two vibrations having frequencies close to each other are superposed. the frequency of the resulting bit is
the difference between the frequencies of the two oscillations
what is the interpetation of the standard error (SE)?
the dispersion of the sample means about the population mean
which of the following statments is true for the standard error SE?
the dispertion of the sample means about the unknown population mean
over the critical velocity.....
the flow becomes turbulent
which principle explaines why the speed of blood flow decrease in the capillaries?
the flow speed of fluid in inversely propotional to the total cross section of the pipe
According to Coulomb's law:
the force between two point charges is directly proportional to the charge of the individual point charges, and inversely proportional to the square of the distance between them.
Which is true?
the force is not always perpendicular to the lever arm
which line defines a force of 1 newton?
the force that accelerated a 1kg body by 1m/s2
which statment of hearing is true
the inner ear act as a fourier transformer
which statement is true for waves
the intensity of a wave represent the energy passing through a unit area in unit time
what does median survival time represent?
the interval after which half the population under the stdy still alive
which statement is true for a system performing harmonic oscillations at the instant when the body passes through the equilibrium point?
the kinetic energy has a maximum
in an isometric muscle contration of a muscle:
the lenght of a muscle is constant and the stress changes
during isometric contration of muscles:
the length of the muscle is constant and the sterss changes
which of the following statements is true for the Torque in frictionless system
the lever arm in is the distance between the axis of rotation and the line action of the force
which one of the following statements about audiometry is true?
the maximum sensetivity region for the human hearing is around 3-4 kHz and is associated with the resonance of the auditory canal
what happenes if Shannon's law is violated when distinguishing a sinusoidal signal?
the measured frequancy may be less than the actual frequency
which statement is true for surface tenstion and mechanical stress?
the mechanical sterr arrising in the wall of a hollow organ is directly propotional to the internal pressure
which of the following statements is corrent for hollow organs
the mechanical sterss arising in the wall of a hollow organ is directly propotional to the radius of the cavity
which one of the following statements represent a Random error?
the movement of the pointer due to shaking of the building
which one of the following statements is correct for muscle function?
the muscle converts chemical energy into mechanical energy
the acceleration of a body is zero. Which one of the following statements is not true?
the net foce acting on the body is non zero
If a body is moving straight with a constant speed, then...
the net force acting on it is zero
what is the condition for an equilibrium for a rigid body?
the net force and the net torque about any axis acting on it are both zero
the effect of a treatment of the blood pressure was examined. the blood pressure of 2 groups were measured. not treated 23 patient. treated 25 patient. the calculated p value is 0.034 the t test statistics is 21,12. which is true?
the null hypothesis is rejected, because p<0,05
choose the defenition of frequancy
the number of cycles that take place in a unit of time
If we combine thin lenses to form a lens system, which property of the lenses will add up?
the optical power
what is aliasing?
the phenomenon that when undersampled, a signal is measured to be of lower frequency than in reality
The Hagen-Poiseuille law is valid for a liquid flowing in a capillary. The volumetric flow rate can be doubled if...
the pressure difference between the ends of the capillary is doubled.
we observe a maximum transmission of pulse pressure to the cuff when...
the pressure in the cuff equals the mean arterial pressure
If you measure the blood pressure by a stethoscope, the diastolic blood pressure value is equal to
the pressure in the cuff when the last Korotkov sound is heard.
if you measure the blood pressure with a stethoscope the diastolic blood pressure value is equal to
the pressure in the cuff when the last korotkoff sound is heard
which parameters were registers by the biopac system during blood preasure meassurement?
the pressure in the cuff, the sound signals from the sthetoscope and the ECG signal
Containers of different shapes and sizes are filled with the same liquid until the same level. Which one of the following statements is CORRECT?
the pressure on the bottom is the same for each container
what is the interpetation of the p value?
the probability of finding a difference at least as much as the observed defference if the null hypothesis (= no effect) applies
the confidence level defines...
the probability of the event that the interval containes the unkown population parameters
which statement is true for linear momentum?
the product of mass and velocity vector
The force acting on a point charge in an electric field is equal to...
the product of the electric field strength and the charge of the point charge.
which one of the following statements is correct for diffusion
the rate (velocity) of diffusion decrease if the viscosity of the surrounding medium increases
which statement is not true for muscular activity
the ratio of the force exerted to the instantaneous velocity of the muscle contraction reveals the power of the master
it is correct for astigmatism that
the relative power of the eye is greater in one plane than in a perpendicular one
which task is NOT associated with the outer ear?
the role of a transductor
A feather and a lead ball are dropped from rest in vacuum on the Moon. The acceleration of the feather is:
the same as that of the lead ball
which of the following is the assumption of the on-sample t test?
the sample is drawn from a population of a normal distribution
which statement is true for the work?
the scalar product of the displacment and the force
which of the following is the definition of wavelength?
the shortest distance between two points in the same state of motion
What is the result of high-pass filtering?
the slow fluctuations disappear
which statement is not correct for ammon signs?
the smaller the sign which the patient can just discern, the grater the visual angle limit of the patient
which one of the following statements is not true? (waves)
the speed of the wase is inversely propotional to the wavelength
what is diffusion?
the stochastic (so called brwonian) motion of the particles due their temperature. The process which is responsible, for example, for the equalisation of concentrations.
which method can be used for teston the null hypothesis of whether thes is a linear dependence between salary and the duration of the employment?
the t test correlation
the standard reference sound intensity for the dB scale is about..
the threshold of human hearing at 1000 Hz
which statement is true for entropy?
the unit of entropy is j/k
In viscous fluids, what determines the force required to move the fluid layers relative to each other?
the viscosity of the fluid, the surface area and the velocity gradient
What is the power?
the work done per unit time
which one of the following statements is correct for heat function?
the work of heat can be calculated as the product of the pressure to the volume of the blood pumped out.
what we can say if the correlation between 2 variables is 1?
there is a perfect linear relationship between them.
the effect of a treatment of the blood pressure was examined. the blood pressure measured before and after the treatment. find the alternative hypothesis.
there is effect of the treatment.
The "reaction" force does not cancel the "action" force because:
they act on different bodies
Which quantity can be read from the horizontal axis of the records in the Biopac system?
time
the risk of HPV infection for smokers was measured in a study. The calculated odds ration was 1.58 with a 95% confidence interval of (1.061 - 2.398) we decide...
to accept the alternative hypothesis as the odds ration is significantly different from 1
The direction of gravitational force is always...
towards the centre of the Earth.
The steps of signal acquisition and pre-processing:
transducer - amplifier - analog filter - A-D converter - digital processor
polarisation is related to
transverse waves
which statment is correct? (audiometry)
two intensities can be compared by multiplying their ratio by 10. this is called the decibel scale
Two springs are connected in series and the spring constant of the first spring is twice as large as of the second one. The work done on the second spring compared to the work done on the first spring is:
two times larger
which one of the following lists the parameters of the standard normal distribution correctly?
u=0 and a=1
which one of the following statements is not true for the human eye
under poor lighting conditions the pupil becomes narrower and the cones become active
how can short sightedness (myopia) be corrected?
using diverging (concave) lens
Which parameter of the Biopac system is used to read the actual value of the cursor?
value
The object-lens distance of a diverging lens is 0.5 m, the focal length is 50 cm. The image is...
virtual and the image-lens distance is 0.25 m
The object-lense distance of a diverging lense is 0.5 m, the power is 2 dioptres. The image is...
virtual, the image-lens distance is 0.25 m
which statement is not true on the basis of newtons law of friction?
viscosity charecterises the density (mass to volume ratio) so for example the viscosity of oil is much less than that of mercury
during the non-invasive measurement of the arterial blood pressure which mechanism are involved in the generation of Cult of korotkoff sounds
wall detachment, turbulent blood flow, cavitation
What is the SI unit of the power?
watt
horsepower (HP) is an absolute unit of power, maily used to charecterise the power of car engines. in which SI unit can horsepower can be expressed?
watt
how can we obtain the mean arterial pressure?
we add one third of the pulse pressure to the diastolic pressure
during isometric muscle contraction...
we do work in the biological sense but not in the physical sense
which one of the following describes the general aim of hypothesis tests?
we examine weather our reasult (difference in samples) is greater than the difference caused by chance.
when are non parametric tests used?
when the datat are ordinal (such as low - moderate - high or passed - accepted - good - excellent)
when do korotkoff sounds occur for the first time
when the pressure in the cuff falls below the systolic pressure
systolic pressure was measured in 5 patient before and after treatment. The mean difference is 6 mmHg, the standard error of the difference is SE=4.65 mmHg. The test statistics is 1.29, the T value in the table is 2.776. is the difference segnificant at the level of 5%?
|t| < t[table], so the difference is not segnificant at the 5% level
normal level = 14.10 mg/l. 10 measured, sample mean = 14.03, sd = 0.027. test satistics is 8,198
|t|> t alpha, null hypothesis is rejected; the difference is significant at alpha level
Weber's law presents a relationship between the size of a just noticeable difference ΔI and the size of the stimulus or background (I). Which one of the following lines contains this relationship CORRECTLY?
ΔI ~ I
What is the SI unit of the specific heat?
J/(kg·K)
Choose the unit of the specific heat capacity.
J/(kg·°C)
Let Io indicate the threshold sound intensity for hearing. Which one of the following formulas gives the sound intensity in dB for a source of I intensity?
L = 10·log(I/Io)
how can we calculate the mean arterial pressure
MAP = SBP - 2/3PP
Which of the following quantities is NOT a vector?
Mass
Which one of the following statements is CORRECT? (optical power)
Optical powers are added if thin lenses are put together.
Which one of the following statements APPLIES to mechanical oscillations?
Oscillation can be any physical phenomenon (quantity) which is periodically repeating.
Which one of the following statements is CORRECT? Osmosis/osmotic pressure
Osmosis through a semipermeable membrane means unidirectional diffusion (inflow of solvent).
Which formula is NOT correct for electric power? (P - power, U - voltage, I - current, R - resistance, W - electric work, t - time)
P = U/I
if Z is a standard normaly distributed random variable. what is the probability that the value of z is grater than 1? (choose the most correct answer)
P(Z>1) = 0.15865
if Z is a standard normally distributed random variable. What is the probability that the value of Z is greater than 2?
P(Z>2) = 0.02275
the pressure of some reference level in a liquid is P0. how large is the total pressure at the hight h?
P0 + desityXgXh
which statement is true for Power
Power characteristic the rate of the work or the energy transfer
Which of the following statements is TRUE for power?
Power is defined as the work done in unit time.
Which statement on the aural sensation is CORRECT?
Psychophysics investigates the relationship between physical stimuli and the measure of the subjective sensation.
in a study, the systolic blood pressure of 25 healthy patient was measured. The mean was 117 mmHg, and the standard error was SE = 5.5 mmHg. Calculate the standard error.
SE = 1.1
Which one of the following statement is TRUE for the mechanics of point like objects?
The position and movement of any body is relative, thereby they can only be described relative to other bodies.
The v(t) velocity-time graph of a body is a straigth line with a negative slope.
The velocity of the body decreases in time uniformly
Which one of the following statements is CORRECT? (Hagen-Poiseuille law)
The velocity profile of a flowing viscous fluid in a pipe is parabolic.
Which one of the following statements APPLIES to visible light?
Visible light is in the 400-700 nm wavelength range.
Which one of the following physical quantities is NOT involved in the state equation of ideal gases?
coefficient of thermal expansion
In simple harmonic motion, if the displacement is a sine function of time, which function describes the acceleration?
minus sine
The ratio of two sound intensities is 100. What is their relative sound level?
+20 dB
The ratio of pressures in two waves is 100. What is the difference in their pressure levels?
+40 dB
The ratio of two sound pressures is 100. What is their relative sound level?
+40 dB
Approximately how large is the total refractive power of the healthy human eye?
+60 dpt
The movement of a body is described by the following equation ( x given in meters, t given in seconds): x = -2t2. What is the average velocity for the interval between t = 0 and t = 2 s?
- 4 m/s
The movement of a body is described by the following formula: x = -2t2 where x and t are measured by meter and second, respectively. What is the average speed from t = 0 to t = 2s?
- 4 m/s
14.10 mg/l. sample mean 14.03, sd 0.027. calculate the test statistics
-8,198
A student keeps a 10-kg body at 1 m above ground level for 30 s. The work done is:
0 J
The nerve conduction velocity of the atriovetricular node is 0.06 m/s. How many seconds does the stimulus need to travel 4 mm?
0,067
We view an object that is 1 cm high from a distance of 5 m. How many degrees is the visual angle?
0,11
The nerve conduction velocity of the atriovetricular node is 0.06 m/s. How many millimetres does the stimulus travel in 3 ms?
0,18
the higher treshold of the frequency domain for human speech is 3 kHz. Assuming speed of wave of 330 m/s, how many meters is the wavelength of this tone
0.11
In summer training, the body of a 75-kg athlete evaporates 1.2 litres of water. How much heat is taken away? (L = 2.25·106 J/kg)
2.7·106 J
What is the approximate size of an object (in millimetres) whose extreme points can just be distinguished by a patient with 100% visual acuity at a distance of 10 m?
2.9
A converging lens with a focal length of 25 cm is placed close to another converging lens with a focal length of 100 cm. How many centrimetres is the net focal distance of this system?
20
a converging lens with a focal length of 25 cm is placed close to another converging lens with a focal lens of 100cm. how many cm is the net focal distance of the system
20
which one of the following is the lower frequency limit of hearing for the healthy youth population
20 hz
Each second, 83 ml blood flows through an aorta segment with a cross-section of 4 cm². How large is the volumetric current density of the blood in units of mm³/(mm²·s) = mm/s?
207,5
calculate the body mass index of a person 196.1 cm and 89.1 kg
23.16
In a summer training, the body of a 80-kg athlete evaporates 1.13 litres of water. How many kilojoules of heat was withdrawn thereby? (Heat of evaporation for water: 2.25·10⁶ J/kg)
2542,5
How many voltage levels can be distinguished by an 8-bit analog-digital converter?
256 (= 2^8)
Each second, 83 ml blood flows through an aorta segment with a cross-section of 3.2 cm². How large is the volumetric current density of the blood in units of mm³/(mm²·s) = mm/s?
259.4
a tunning fork has the frequency of 440 Hz. How many milliseconds is the period of its vibration?
27.Feb
273 cm3 of an ideal gas is at 0o C. It is heated at constant pressure to 10 oC. It will now occupy:
283 cm3
200,000g (g=10m\s2) sedimented macromolecule 0.15 ms
300
Which statement is TRUE on the basis of Bernoulli's law?
An increase in the flow speed increases the dynamic pressure.
What is chromatic aberration?
An optical aberration due to dispersion.
Which statement is CORRECT for anthropometry?
Anthropometry supports the risk assessment of diseases related to metabolic disorders.
Which principle can directly explain why the pressure acting on the wall of an aneurismal vessel increases?
Assuming a constant hydrostatic pressure, the sum of the static and the dynamic pressure along a pipe is constant.
Which one of the following statements APPLIES to the reflection and refraction of waves?
At boundary of two media with different acoustic impedance the incoming mechanical wave is partly reflected (R) while the other part will further propagate in a modified direction (T).
Which one of the following statements APPLIES to the decomposition of vibrations?
By Fourier transform, periodic oscillations can be decomposed to the sum of harmonic components.
How can a channel be activated in the Biopac system?
By clicking on the title of the channel.
Which one of the following statements is CORRECT? Thermodynamics
Everything else, which does not belong to the system, is called environment.
Which statement is CORRECT for the first principle of thermodynamics?
It is an extension of the energy conservation principle on systems, which are in thermal equilibrium with their environment.
Which statement is TRUE for surface tension and mechanical stress?
If the radius of a spherical surface decreases, then the surface pressure increases.
Which one of the following statements is NOT true (geometric optics)?
If two thin lenses are combined to form a lens system, the focal distances of the lenses are added.
Which statement is TRUE for thermodynamic processes?
In an isotermic process, if the gas volume is halved, then the pressure doubles.
Which one of the following statements is CORRECT? (gas laws)
In an isothermal process, the temperature of the gas remains constant.
Which one of the following statements is CORRECT? (waves)
In longitudinal waves, particles of the medium oscillates parallel to the direction of wave propagation.
Which one of the following statements is characteristic of mechanical waves?
In mechanical waves, the state of motion (energy) of a vibrating object propagates in time and space in an elastic medium.
Which one of the following statements is FALSE? Processes thermodynamics
In mechanics, all frictionless processes are irreversible.
Which statement is TRUE for heat conduction?
It can take place only in media where the particles are localised (such as solids).
Which one of the following statements is CORRECT for flow current (current intensity)?
It equals the amount of material transported over unit time in a direction perpendicular to a given surface.
Which statement is CORRECT for thermal radiation?
Its spectrum is continuous.
Which one of the following statements applies to heat conduction?
No macroscopic material transport is involved.
Choose the unit of molar heat capacity.
Numerically, the heat required to increase the temperature of 1 mol of a substance by 1 °C.
what is the alternative hypothesis of the odds ration (OR)?
OR is not equal to 1
Which one of the following statements is FALSE for hearing?
The perceived sound intensity only depends on the pressure amplitude and not on the frequency of the sound.
Choose the definition of the period.
The period is the shortest time interval after which a physical quantity becomes the same as the original value.
Which one of the following statements is CORRECT? Heat
The thermal radiation emitted by a body is directly proportional to the surface area.
Which one of the following statements is CORRECT? (harmonic oscillation)
The total mechanical energy (the sum of the potential and kinetic energy) of a body performing harmonic oscillation is constant in time.
Which one of the following statements is CORRECT?
The two main forces influencing our motion are the gravitational force and the force of friction.
Which statement is TRUE for optical imaging?
The unit of optical power is the dioptre, which is the reciprocal of the focal length measured in metres.
Which statement is TRUE based on the laws of geometric optics?
Total internal reflection may occur when light propagating in a high refractive index medium reaches a boundary of a lower refractive index medium.
Which one of the following statements is CORRECT? (intensity)
Two intensities are compared by multiplying their logarithm of the ratio of their intensity with ten. This is the decibel scale.
Which one of the following represents a systematic error?
We forget to set the zero value of the bathroom scales before measuring our body mass.
which one of the following statement is not true? Work...
can have either a positive or a negative sign depending on wheather the force has a component perpendicular to the displacement of the body
which one of the following SI orefixes represent 10-2?
centi-
which one of the following statements is correct? (body mass index)
central obesity is defined as waist-hip ration > 0.95 males> 0.8 females
the kinetic energy of a body performing harmonic oscillation
changes periodicly in time
which test should be used to the decision if there is a relationship between the sex of a pet owner and the chosen per (dog/cat/etc)?
chi-square test for independence
5 patient, mean difference is 6mmHg. SE=4.65 mmHg. a=0.05. find t
degrees of freedom = 4, t in table 2.776
in a study, the systolic blood pressure of 10 healthy women was measures. The mean was 119 mmHg and the standard error was SE = 0.664 mmHg. Give the number of degrees of freedom and the critical t value (a= 0.05) for the case when we test if the population mean is equal to 125 mmHg.
degrees of freedom = 9, t(table) = 2.262
Which one of the following physical quantities is NOT included in the ideal gas law?
density
the dopler effect....
lets the resting reciver perceive a frequency higher than the actual one if the source approaches her
which statment is true for waves
longitudinal waves consist of periodically changing compressions and rarefactions
which is the unit of the focal distance
m
which one of the following is the SI unit of amplitude?
m
Which line characterises the image formed of an object positioned at a distance between the focal length and twice the focal length of a converging lens?
magnified, real and inverted
Which one of the following lines contain a physical quantity and a unit that do NOT match?
mass - ampere
a thermodynamic system is open if
material and energy can be interchanged between the system and it's surrounding
in a survival study, the interval after which half of the population under study alive is called...
median
calculate the median and the range of the small sample X (3;0;4;3;0)
median = 3 range = 4
calculate the median and the range of the amsll sample (4,1,5,4,1)
median = 4 range = 4