Choose the correct answer
At 0 o C , the top of the mercury column in a glass thermometer is 10 cm above the bulb. At 100 o C , the top of the mercury column is 30cm above the bulb. What is the temperature when the top of the mercury column is 15cm above the bulb?
25 o C
The frequency not audible to the human ear is
30 000 Hz
Suppose you are approaching with a velocity of 30 m/s a warming device that produces a sound of 300 Hz frequency. The frequency you will perceive will be
326 Hz
The average human body temperature is 98.6 F. What is the equivalent temperature on the celius scale?
37 o C
Cutting down the distance to thw light source by half increases the light intensity by a factor of
4
The alveoli of the lungs are lined by a substance which exerts surface tension at the air-liquid interface. Suppose the alveolar lining layer has a surface tension of 30 x 10^-5 N/cm and the alveoli are partially collapsed to radii of 0.1mm. Considering the existence of only one liquid- air interface, the alveolar pressure required to start expansion of the alveoli is:
4.5 mm Hg
Assuming a reynolds number of 4500, the critical velocity for the onset of turbulence in the 2 cm -diameter ascending aorta
40 cm/s
Water has a specific heat capacity of 4200J/kg o C. How much heat is required to raise the temperature of 1.0 kg of water by 1 o C?
4200 J
If in the unobstructed artery the flow velocity is 50 cm/s , then in the constricted region, where the area is reduced by a factor of 9, the velocity is
450 cm/s
Suppose the partial pressure of Co2 in the alveoli of the lungs is 40 mm Hg. What percentage of the alveolar air does it constitute? Assume P total= 760mm Hg
5%
Electrons in an x -ray machine are accelerated from rest through a potential difference of 50 000 V. What is the kinetic energy of each of these electrons in eV?
50 keV
By what factor is the total pressure greater at a depth of 700m in water than at the surface where pressure is one atmosphere?
70
How far away can a 100 W-police siren be heard? Assume the minimum detectable intensity is 10.0x10^-6 W/m^2
890km
If the radius of an artery is narrowed by a factor of 3, the cross-sectional area will decrease by a factor of
9
With all other factors kept constant, the most likely to burn your mouth when taken straight from an oven is a food with
A lower specific heat
Blood flows from the right atrium to the
Pulmonary arteries
Heat is added to an ideal gas and it expands at constant pressure. The gad does work W. What is the amount of heat added to the gas?
Q=W
The resistance of a thermistor changes with temperature according to the expansion
R t = Ae ^B/T
According to Ohm's law for a part of a circuit
R=U/I
The part of the thermocouple that is kept at a known temperature is called
Reference junction
A circuit contains two unequal resistors connected in parallel
Same current flow through them
The body will
Sink
The heart electrical impulses start in the
Sinoatrial node
Suppose the pressure at the bottom of a filled beaker of water is P. The water is poured out , and the beaker is filled with ethyl alcohol. What is the pressure at the bottom of the glass?
Smaller than P
Under resting conditions, ion distribution across the cellular membrane is such that.... ions are most abundant on the outside of the cell, while... ions are most abundant on the inside of the cell
Sodium, potassium
Suppose the substance A has a higher specific heat than the substance B. Which substance needs more energy to be heated to the same temperature? (Consider the massess of A and B equal)
Substance A
The kinetic energy of atoms and molecules is proportional to
Temperature
The term heat in physics is
The energy transferred to a body because of a temperature difference
The two temperature scales with the same interval step size are
The kelvin and the celsius
Faraday's Law states that the voltage generated in the coil is proportional to
The rate of change of the magnetic flux
The decrease of resistance with the temperature is a property of:
Thermistor
Suppose three different objects placed in a room are in thermal equilibrium. Which of them has the highest temperature?
They all have the same temperature
Which statement about the exchange of fluid between capillaries and interstitial space is not correct?
Tissue hydrostatic pressure is usually greater than blood hydrostatic pressure
Heart sounds heard in a stethoscope are due to
Turbulent flow between heart chambers
When an ideal gas does positive work on its surroundings, which of the variables increases?
Volume
The light intensity is measured in
W/m^2
Suppose a gas in a thermally isolated cylinder is compressed. Then
W>0, Q=0, delta U> 0
The wavelength satisfying the standing wave condition in a string of length L is:
Wavelength n = 2L/n
In which case does an electric field do positive work on a charged particle?
When a positive charge moves in the direction of the electric field
A large and a small container of water with the same temperature have
different amounts of heat
An ECG measures
electrical activity of the heart
A wooden ball of mass m and volume v floats on a swimming pool. The density of the wood is p wood < p water. The upward buoyant force acting on the ball is:
p water gV
The weight density is given by the following formula
rho • g
The period of a wave is measured in
s
The velocity, frequency and wavelength are related by
v=wavelength•f
The distance between a given compression and the next rarefaction of a longitudinal wave equals
wavelength
Suppose 1 kg of 90oC water is mixed with 5 kg of 10oC water. What is the final temperature of the mixture?
23.3 o C
A steel box of mass m and volume v rests on the bottom of a swimming pool . Compared with the buoyant force, the weight of the box is
Bigger
Which two pressures, if positive, will oppose capillary filtration?
Blood osmotic pressure and tissue hydrostatic pressure
In a metal
None of the above ( free charge carriers are the electrons and the holes, the conductivity decreases with the increase in temperature, the conduction band is empty)
Both sound and light waves
Obey the laws of reflection and refraction
The equilibrium potential
Of a given ion across a membrane is a function of the ion concentration gradient
When sound travels in air, the air molecules
Oscillate along the direction of wave propagation
Which one of the following correctly indicates the SI unit of dynamic viscosity
Pa s
An ideal gas in a cylinder undergoes adiabatic expansion and performs 40 J of work on the environment. How much energy is transferred to the gas as heat?
0 J
Let us assume that the average blood pressure is 100mm Hg . If 80ml of blood is pumped each second, the work performed by the heart per second is
1.1 J/s
The normal blood volume flow rate is 5 l/min at an average blood pressure of 100mmHg. The pressure power output of the heart is
1.1 W
Suppose the radius of a blood vessel is reduced to 90% of its original value by plaque deposits. The body compensates by increasing the pressure difference along the vessel to keep the flow rate constant by a factor of
1.52
The linear expansion coefficient has the unit of
1/oC
The magnitude of an electric current is 10 A. This value is the same as
10 C/s
Pressure due to the weight of a meter depth of water is approximately
10 kPa
Consumption of 20 liters of oxygen per hour is equivalent to how many molecules per second?
15x10^19
Poisuelle's Law shows that if the pressure drop remains constant, a 20% decrease in the radius of the arterioles reduces the blood flow by more than a factor of
2
Suppose heat is added to a system and an equal amount of work is done on it. What is the change in the internal energy of the system
2 Q
A cube of wood with a density of 0.78 g/cm^3 is 10cm on a side. When placed in water, what height will the cube float above the surface of the water?
2.2 cm
A transverse wave travels on a string according to the expression y=0.10 sin (5 pie x + 5 pie t) , where x and y are measured in meters and t - in seconds. The frequency of this wave is
2.5 Hz
When a substance moves from an area of low concentration to an area of higher concentration, we call this transport
Against the concentration gradient
A neuron
All of the above (is the basic unit of the nervous system, is a nerve cell, functions by producing electrical signals, may communicate with other neurons via chemical signals)
The temperature transducer that does not require power supply to operate is
All of them above ( electrical resistance thermometer, thermistor, thermocouple)
Suppose an individual capillary has a diameter of 8micrometer and a length of 1 mm compared to a diameter of 20micrometer and a length of 2 mm for an arteriole. Related with the arteriole, the capillary would have a resistance to flow
Almost 20 times greater
The force of attraction or repulsion between point charges at rest is directed
Along the line joining the two charges
A grid-control vacuum tube acts as
An amplifier
A device that converts mechanical energy to electrical energy is called
An electric generator
Which of the following units are used to measure heat?
Any of these (joule+ calorie)
Which vessel type is not correctly described?
Arterioles return blood from the tissues to the atria
As blood moves away from the heart, the arteries branch and rebranch many times to carry blood to the various tissues. The smallest blood vessels are
Capillaries
The exchange of nutrients and wastes between the blood and body tissues occurs mainly in
Capillaries
Threshold stimuli are strong enough to
Cause a net flux of positively charged ions from outside to inside the cell
An electroscope is a device used to detect
Charges
The mechanical sound vibration inside the inner ear are converted into electrical signals by the
Cochlea
The difference in the concentration of substances per unit length is called
Concentration gradient
For the smallest temperature differences, the electronmotive force E of thermocouple can be determined using the equation
E=a (t2-t1)
When a wave travels through a medium
Energy is transferred at a constant speed
Which one of the following statements is the best explanation for the fact that metal pipes that carry water often burst during cold winter months?
Freezing water expands while metals contract at lower temperatures
Which of the following units is not an energy unit?
Horsepower
In response to a stimulus, if the membrane potential becomes more negative than the resting potential, then the membrane is said to be
Hyperpolarized
Suppose the charge q of a capacitor is doubled and the potential difference V across the places is reduced twice. The capacitance of the capacitor will
Increase
Consider a parallel plate capacitor is holding a charge +q on one plate and -q on the other. Which of the following activities will raise the potential difference across the plates? Assume constant charge density
Increasing the separation distance between the plates
A transverse wave moves along a string with a constant speed of 5 m/s. The acceleration of a point on the string
Is zero
Which thermodynamic process occurs at a constant temperature so that the internal energy of a system does not change?
Isothermal
The unit of electric potential , the volt, is dimensionally equivalent to
J/C
A ball is held completely submerged in a container just below the surface of water. It is then moved to a deeper point in the water. Compared with the force needed to hold the ball just below the surface, what is the force needed to hold it at the deeper point?
Larger
The speed of sound wave through a given medium depends on the
Medium
The action potential has a duration of
Milliseconds
The coulomb's constant is measured in
N m^2 / C^2
The stiffness constant is measured in
N/m
A triode usually functions with a control grid at .... potential with respect to cathode
Negative
Suppose two identical harmonic waves of amplitude A interfere (no phase shift). Which statement is not correct for the net result?
No wave
In a standing person, since blood travels against gravity from the heart to the brain, the blood pressure will
decrease as it travels to the brain
The flow of blood through a capillary requires a higher pressure where the blood enters the capillary than where it leaves. That is most directly related to
delta P = pg delta h
