physics tests FINAL
3. When the distance between two charges is halved, the electric force between them A. Is reduced by ¼. B. Halves. C. Quadruples. D. None of the above
C. Quadruples.
. When a projectile moving in a parabolic path reaches its highest point above the ground, A. Its velocity is instantaneously zero B. Its acceleration is instantaneously zero C. Its weight balances the force of air resistance D. The net force it feels is instantaneously zero E. None of the above.
A. Its velocity is instantaneously zero
A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is A. less. B. greater. C. the same.
A. Less
The equivalent(combined) resistance of 1-ohm, 2-ohm, and 3-ohm in parallel is about A. 0.06 ohm. B. 1 ohm. C. 1.8 ohms. D. 6 ohms. E. 9 ohms.
A. 0.06 ohm.
An ampere is a unit of electric A. current. B. voltage. C. resistance.
A. current.
Which one of these represents the largest amount of energy? A. 1 Calorie B. 5 joule C. 10 calorie D. 100 calories
A. 1 Calorie
What is the mass of a ball moving at 12 m/s with a momentum of 48 kg·m/s? A. 4 kg. B. 12 kg. C. 48 kg. D. 192 kg.
A. 4 kg.
The electric resistance in a length of a wire is doubled when the wire is ______. A. twice as long B. properly insulated C. half as long D. doubled in temperature
A. twice as long
The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process? A. Conduction B. Radiation C. Convection D. Vaporization
A. Conduction
Electric power in a circuit is the rate at which ______. A. energy dissipates B. current dissipates C. wattage dissipates D. voltage dissipates
A. energy dissipates
One kilowatt-hour is a unit of A. energy. B. power. C. voltage. D. current. E. resistance.
A. energy.
When the filament breaks in one lamp in a series circuit, other lamps in the circuit normally _____. diagram
A. go out
Compressions and rarefactions are characteristic of A. longitudinal waves. B. transverse waves. C. Both of these. D. none of the above
A. longitudinal waves.
To become a positive ion, an atom must A. lose an electron. B. gain an electron. C. lose a proton. D. gain a proton.
A. lose an electron.
Which of the following is that form of energy associated with an object's location in a conservative force field? A. potential B. thermal C. bio-chemical D. kinetic
A. potential
Both a radio wave and light wave have identical A. speeds. B. wavelength. C. frequencies. D. all of the above. E. one of the above
A. speeds.
. What happens to a volume of water when its temperature is reduced from 8°C to 4°C? A. Density increases B. Density decreases C. Density remains constant E. Vaporizes
A. Density increases
What happens to a given volume of water when heated from 0°C to 4°C? A. Density increases B. Density decreases C. Density remains constant D. Vaporizes
A. Density increases
A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick is A. the same as that of the 1-kg book. B. 5 times as much for the 1-kg book. C. 10 times as much as for the 1-kg book. D. zero.
A. the same as that of the 1-kg book.
Most energy transfer occurs in water when it ______. A. vaporizes B. melts C. increases from its melting temperature to its boiling temperature.
A. vaporizes
When a pair of 1-ohm resistors are connected in series, their equivalent(combined) resistance is 2 ohms, and when connected in parallel is A. ½ ohm. B. ¼ ohm. C. 2 ohm.
A. ½ ohm.
A music console is pushed 2 m by a force of 20 N. The work done on the console is A) 2 J. B) 10 J. C) 20 J. D) 40 J. E) 80 J.
D) 40 J.
15. Which has zero acceleration? A) an object at rest B) an object moving at constant velocity C) an object in mechanical equilibrium D) all of the above E) none of the above
D) all of the above
. Which best expresses the value for the coefficient of volume expansion, β, for given material as a function of its corresponding coefficient of linear expansion, α?
β=3α
A ball rolls around a circular track with an angular velocity of 4s rad/s. What is the period of the motion?
1/2 s
A girl pushes a cart to the left with a 100-N force. At the same time a boy pushes it to the right with a 50-N force. The net force exerted on the cart is A) 50 N to the left. B) 50 N to the right. C) 100 N to the left. D) 100 N to the right.
A) 50 N to the left.
When Marie pushes her desk to the right, friction between the floor and the desk acts toward A) the left. B) the right. C) at right angles to her push. D) none of the above
A) the left.
A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp is A. less. B. greater. C. the same.
B greater
A 2-kg mass that weighs 20 N has 40 J of potential energy relative to the ground. What is its height? (Potential Energy, -* = '.ℎ and Weight, 0 = '.) A) 1 m B) 2 m C) 3 m D) 4 m E) none of the above
B) 2 m
When a 10-N object is suspended at rest by two equally-taut vertical strands of rope, the tension in each strand is A) less than 5 N. B) 5 N. C) more than 5 N. D) 10 N.
B) 5 N.
To become a negative ion, an atom must A. lose an electron. B. gain an electron. C. lose a proton. D. gain a proton.
B. gain an electron.
For this sinusoidal wave, what is the frequency? diagram A. 50 Hz B. 100 Hz C. 200 Hz D. 400 Hz
B. 100 Hz
The period of this wave is A. 1 s B. 2 s C. 4 s D. Not enough information to tell
B. 2 s
The Earth has a radius of 6,400 kilometers. A satellite orbits the Earth at a distance of 12,800 kilometers from the center of the Earth. If the weight of the satellite on Earth is 100 kilonewtons, the gravitational force on the satellite in orbit is A. 11 kilonewtons B. 25 kilonewtons C. 50 kilonewtons D. 100 kilonewtons E. 200 kilonewtons
B. 25 kilonewtons
Which one of these cites the lowest temperature? A. 0°" B. 270 K C. 273 K D. 32°
B. 270 K
What is the temperature of a system in thermal equilibrium with another system made up of ice and water at one atmosphere of pressure? A. 0 ℉ B. 273 K C. 0 K D. 100 ℃
B. 273 K
. Two liquids, A and B, have equal masses and equal initial temperatures. Each is heated for the same length of time over identical burners. Afterward, liquid A is hotter than liquid B. Which has the larger specific heat? [Hint: G = HIΔK] A. Liquid A B. Liquid B C. There is not enough information to tell
B. Liquid B
With no air resistance a projectile fired horizontally maintains its horizontal component of velocity because A. No forces act on it. B. No horizontal forces act on it. C. of no initial vertical component of velocity. D. All of the above E. none of the above
B. No horizontal forces act on it.
What are the signs of the position, velocity, and acceleration during the ascending part of the trajectory? POSITION VELOCITY ACCELERATION A. Positive Positive Positive B. Positive Positive Negative C. Positive Negative Negative D. Negative Positive Negative E. Negative Negative Negative
B. Positive Positive Negative
A woman sits on a spinning piano stool with her arms folded. When she extends her arms, which of the following occurs? A. She increases her moment of inertia, thereby increasing her angular speed. B. She increases her moment of inertia, thereby decreasing her angular speed. C. She decreases her moment of inertia, thereby increasing her angular speed. D. She decreases her moment of inertia, thereby decreasing her angular speed. E. Both her moment of inertia and her angular speed remain constant.
B. She increases her moment of inertia, thereby decreasing her angular speed.
Your weight is A. Another word for your mass. B. The gravitational attraction between you and earth. C. A property of mechanical equilibrium. D. the same in all locations.
B. The gravitational attraction between you and earth.
The units of measurement, power in watts is equal to A. ampere × ohms B. ampere × volts C. volts⁄second D. none of the above
B. ampere × volts
The inside surface of a glass window becomes wet when the temperature outside is ____. A. either warm or colder B. colder C. almost exactly the same as on the inside D. warmer
B. colder
When the filament breaks in one lamp in parallel circuit, lamps in other branches of the circuit normally ______.
B. continue glowing as brightly
It is said that electric charge is quantized, which means that the charge on an object A. may occur in an infinite variety of quantities. B. is a whole-number multiple of the charge of one electron. C. will interact with neighboring electric charges. D. can be neither created nor destroyed. E. is sometimes positive.
B. is a whole-number multiple of the charge of one electron
If two copper wires of the same length have different thickness, then the thicker wire has A. more resistance. B. less resistance. C. both the same
B. less resistance.
Gravitational force is greater for a satellite in elliptical orbit when it is at the A. apogee (farthest point). B. perigee (closest point). C. zenith D. same acceleration at all the above places.
B. perigee (closest point).
One kilowatt is a unit of A. energy B. power C. voltage D. current E. resistance
B. power
Heat travels from the Sun to Earth by the process of ________. A. conduction B. radiation C. convection D. conduction and convection
B. radiation
When steam changes phase to water, it A. absorbs energy. B. releases energy C. neither absorbs nor releases energy. D. becomes more conducting.
B. releases energy
If the sum of the external torques acting on an isolated system of particles is zero, it must be true that A. the system can have no kinetic energy. B. the angular momentum of the system does not change. C. the system can have no angular momentum D. the system can have no linear velocity. E. The angular momentum of the system must be continually decreasing.
B. the angular momentum of the system does not change.
When a rock thrown straight up reaches the exact top of its path, its velocity is A. zero and its acceleration is zero. B. zero and its acceleration is 9.8 m/s2 . C. about 9.8 m/s and its acceleration is zero. D. About 9.8 m/s and its acceleration is 9.8 m/s2
B. zero and its acceleration is 9.8 m/s2 .
A tow truck exerts a force of 3000 N on a car that accelerates at 2 m/s2 . What is the mass of the car? A) 500 kg B) 1000 kg C) 1500 kg D) 3000 kg E) none of the above
C) 1500 kg
The distance between Earth and the Moon is 3.84 × 10% m. A pulse of laser light aimed at the Moon that bounces back to Earth undergoes a round-trip time of about [UVWX: P = ∆Ñ⁄∆X aWl PZ[\]VX^ \_ [V{ℎX, P = ] = 3 × 10%i/b] A. 0.6 s B. 1.6 s C. 2.6 s D. 4.6 s
C. 2.6 s
A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 50 N. The acceleration of the block is A. 1 m/s2. B. 2 m/s2. C. 5 m/s2. D. 10 m/s2. E. None of the above.
C. 5 m/s2.
A light wave, traveling at 3 × 10% m/s has a frequency of 6 × 10'( Hz. What is its wavelength? A. 5 × 10*% m B. 2 × 10*, m C. 5 × 10*, m D. 5 × 10*- m E. 2 × 10, m
C. 5 × 10*, m
A block is dragged at constant velocity across a level surface by a force of 6 N. What is the force of friction between the block and the surface? A. Less than 6 N. B. More than 6 N. C. 6 N. D. not enough information.
C. 6 N.
What is the speed of a 12-kg ball with a momentum of 72 kg·m/s? A. 3 m/s B. 4 m/s. C. 6 m/s. D. 48 m/s. E. None of the above
C. 6 m/s.
The equivalent (combined) resistance of 1-ohm, 2-ohm, and 3-ohm in parallel is about A. 1 ohm. B. 1.8 ohms. C. 6 ohms. D. 9 ohms.
C. 6 ohms
Which, if either, has greater momentum: a 1-kg ball moving at 2 m/s or a 2-kg ball moving at 1 m/s? (Momentum, % = '() A. A 2-kg ball moving at 1 m/s B. A 1-kg ball moving at 2 m/s C. Both have the same momentum
C. Both have the same momentum
The equilibrium rule ∑ F = 0 applies to A. Object or systems at rest. B. Objects or systems in uniform motion in a straight line. C. Both of the above. D. Neither of the above
C. Both of the above.
A fundamental rule of electricity is that A. Like kinds of charges repel. B. Unlike kinds of charges attract. C. Both of these D. Neither of these
C. Both of these
Which one of the following processes of heat transfer requires the presence of a fluid? A. Conduction B. Radiation C. Convection D. None of the above choices are valid.
C. Convection
Coulomb's law is most similar to which of these laws? A. Archimedes' law of hydrostatics B. The conservation of energy C. Newton's law of gravity D. The law of electric potential
C. Newton's law of gravity
What are the signs of the position, velocity, and acceleration during the descending part of the trajectory POSITION VELOCITY ACCELERATION A. Positive Positive Positive B. Positive Positive Negative C. Positive Negative Negative D. Negative Positive Negative E. Negative Negative Negative
C. Positive Negative Negative
Metal lids on glass jars can often be loosened by running them under hot water. Why is this? A. The hot water is a lubricant. B. The metal and glass expand due to the heating, and glass being of smaller radius expands less than of metal. C. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass thus loosening the connection. D. This is just folklore
C. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass thus loosening the connection.
. When no air resistance acts on a projectile, its horizontal acceleration is A. g. B. at right angles to g. C. Zero.
C. Zero.
. Ohm's law tells us that the amount of current produced in a circuit is A. directly proportional to voltage. B. inversely proportional to resistance. C. both of these D. neither of these
C. both of these
Electric charge can be transferred from one conducting body to another ______. A. only by contact. B. only by closeness without touching C. by both contact and closeness D. by no means, for charge is conserved
C. by both contact and closeness
. The second law of thermodynamics tells us that heat does not flow from _____. A. cold to hot ever B. hot to cold ever C. cold to hot without external energy D. hot to cold without external energy
C. cold to hot without external energy
The thermal expansion of a solid is caused by A. the breaking of bonds between atoms. B. increasing the amplitudes of the atoms vibration. C. increasing the distance between equilibrium positions for the vibrating atoms. D. all of the above.
C. increasing the distance between equilibrium positions for the vibrating atoms.
Which of these does NOT have an electric charge? A. proton B. electron C. neutron D. all of the above E. none of the above
C. neutron
The unit of electrical resistance is the A. volt. B. ampere. C. ohm. D. none of the above.
C. ohm.
. The direction of natural processes is from state of __________. A. lower order to higher order B. disorganization to organization C. organized state to disorganized state D. disorder to equilibrium
C. organized state to disorganized state
The fastest moving planet in a solar system is the A. smallest planet. B. most massive planet. C. planet nearest to the Sun. D. planet farthest from the Sun. E. none of the above.
C. planet nearest to the Sun.
Sound travels faster in A. air. B. water. C. steel. D. a vacuum. E. same in each.
C. steel.
The first law of thermodynamics is a restatement of ______. A. both energy and momentum conservation B. neither energy nor momentum conservation C. the conservation of energy D. the conservation of momentum
C. the conservation of energy
A pair of tuning forks produce sound waves that travel through the air. The frequency of the sound waves produced by the first tuning fork is 440 Hz, and the frequency of the sound waves produced by the second tuning fork is 880 Hz. If P' denotes the speed of the sound waves produced by the first tuning fork and PO denotes the speed of the sound waves produced by the second turning fork, then A. v1' = 2v2 B. v1= 4v2 C. v1 = v2 D. v2= 2v1 E. v2= 4v1
C. v1 = v2
. What is the temperature of a system in thermal equilibrium with another system made up of water and steam at one atmosphere of pressure? A. 0 ℃ B. 273 ℃ C. 0 K D. 100 ℃
D. 100 ℃
The planet Jupiter is 5 times farther from the sun than the Earth, and the mass of Jupiter is 300 times the mass of the Earth. If ./ is the strength of the gravitational force exerted by the sun on Jupiter, and .0 is the strength of the gravitational force exerted by the sun on the Earth, what's the value of the ratio A. ' -N B. ' 'O C. 8 D. 12 E. 60
D. 12
An object is pulled with three forces: one at 20 N to the right, another at 40 N to the right, and the third at 30 N to the left. The net force is A. 60 N to the right. B. 60 N to the left. C. 30 N to the left. D. 30 N to the right.
D. 30 N to the right.
A 2000-kg truck moving at 10 m/s that brakes to a stop in 4 s has an average braking force of A. 2000 N. B. 3000 N. C. 4000 N. D. 5000 N.
D. 5000 N
The reason why a 10-kg rock falls no faster than a 5-kg rock in free fall is that the A. 10-kg rock has greater acceleration. B. 5-kg rock has greater acceleration. C. Force of gravity is the same for both. D. Force/mass ratio is the same for both.
D. Force/mass ratio is the same for both.
9. Inside a house, stepping on a tile floor barefooted may feel almost cold, but stepping on carpet in an adjacent room feels comfortably warm. Why is this? A. It's because the tile is below room temperature while the carpet is at room temperature. B. It's because the tile is at room temperature while carpet is normally warmer. C. It's because the thermal conductivity of tile is less than that of carpet. D. It's because the thermal conductivity of carpet is less than that of tile.
D. It's because the thermal conductivity of carpet is less than that of tile.
14. What type of heat transfer can happen through empty space? A. Conduction B. Evaporation C. Convection D. Radiation
D. Radiation
6. Heat flow occurs between two bodies in thermal contact when they differ in what property? A. Mass B. Specific heat C. Density D. Temperature
D. Temperature
When the velocity of an object is doubled, by what factor is its momentum (%⃗ = '(⃗) changed? By what factor is its kinetic energy ()* = + , '(,) changed? A. The momentum is increased by a factor of 4 and the KE is increased by a factor of 4. B. The momentum is doubled and the KE is doubled. C. The momentum is increased by a factor of 4 and the KE is doubled. D. The momentum is doubled and the KE is increased by a factor of 4. E. The momentum and KE remain the same.
D. The momentum is doubled and the KE is increased by a factor of 4.
Electric potential, unlike electric potential energy, is measured in units of ____. A. joule B. ampere C. coulomb D. Volts
D. Volts
When no air resistance acts on a projectile, its horizontal acceleration is A. g. B. at right angles to g. C. centripetal. D. Zero.
D. Zero.
Condensation is a change of phase ________. A. without energy transfer B. from liquid to gas C. from solid or liquid to gas D. from gas to liquid
D. from gas to liquid
Evaporation is a change of phase _______. A. from solid or liquid to gas B. without energy transfer C. from gas to liquid D. from liquid to gas
D. from liquid to gas
The change in momentum of an object is equal to the A. force acting on it. B. change in its velocity. C. object's mass times the force acting on it. D. impulse that acts on it. E. all of the above.
D. impulse that acts on it.
Which of the following is that form of energy associated with an object's motion? A. potential B. thermal C. bio-chemical D. kinetic
D. kinetic
Melting and freezing are ______. A. not related to the thermal processes. B. processes that bypass energy transfers C. one and the same at the atomic level D. opposite processes
D. opposite processes
Which of these has a higher frequency than visible light? A. radio wave B. microwave C. infrared wave D. ultraviolet wave E. all do
D. ultraviolet wave
A traveling wave has a frequency of 6.0 Hz, an amplitude of 0.2 m, and a wavelength of 0.5 m. What is its speed? A. 0.1 m/s B. 0.6 m/s C. 1.2 m/s D. 2.4 m/s E. 3.0 m/s
E. 3.0 m/s
An object is executing uniform circular motion. Which of the following quantities remain(s) constant during the object's motion? A. Velocity and acceleration B. Speed and velocity C. Speed and acceleration D. Acceleration only E. Speed only
E. Speed only
A woman whose weight on Earth is 500 N is lifted to a height of two Earth radii above the surface of Earth. Her weight A. decreases to one-half of the original amount. B. decreases to one-quarter of the original amount. C. decreases to one-fifth of the original amount. D. decreases to one-third of the original amount. E. decreases to one-ninth of the original amount.
E. decreases to one-ninth of the original amount.
If the masses of two planets doubles and the distance between them also doubles, the force between them would be A. one-quarter B. half as much C. twice as much D. four times as much E. none of the above
E. none of the above
