Conceptual Physics study guide modules 5,6,7,1
A 100-Watt lamp glows brighter than a 25-Watt lamp. The electrical resistance of the 100-Watt lamp must be A) less. B) greater. C) the same.
a
A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? A) 3 m/s B) 4 m/s C) 12 m/s D) 48 m/s E) none of these
a
A ball is thrown upwards from the surface of the earth at the speed 10m/s. It returns to the same position. How long does it stay in the air (neglect the air resistance)? A) 2s B) 4s C) 5s D) 0s
a
A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is A) greater. B) smaller. C) the same.
a
A proton and an electron are placed in an electric field. Which undergoes the greater acceleration? A) electron B) proton C) Both accelerate equally. D) Neither accelerates.
a
An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is A) nearest the Earth. B) farthest from the Earth. C) It travels at constant speed everywhere in orbit.
a
An Earth satellite is simply a projectile A) freely falling around the Earth. B) floating motionless in space near the Earth. C) approaching the Earth from outer space.
a
An object that has kinetic energy must be A) moving. B) falling. C) at an elevated position. D) at rest. E) none of these
a
At the same time an astronaut on the moon sees a solar eclipse, observers on Earth see A) a lunar eclipse. B) a solar eclipse. C) no eclipse at all.
a
Color depends on what characteristic of light? A) its frequency B) its amplitude C) both of these
a
Electrons on the surface of a conductor will arrange themselves such that the electric field A) inside the conductor is zeroA B) tends toward the state of minimum energy C) is maximum D) None of the above
a
If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity A) the object accelerates in the direction of the applied force. B) the object accelerates opposite the direction of the applied force. C) the friction force increases. D) two of the above E) none of the above
a
If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would be A) at the center of the Earth. B) inside the Earth, but off center. C) outside the Earth, but within the orbital path of the moons. D) outside the Earth, but beyond the orbital path of the moons.
a
If the speed of light in a medium is 1.5 × 108 m/s, the medium's index of refraction is A) 2.0. B) 0.67. C) 1.0. D) 1.5. E) None of the above
a
If you push for a half hour or a whole hour against a stationary wall A) no work on the wall is done in either case. B) half as much work is done during the half hour. C) twice as much work is done during the half hour. D) it is impossible to determine how much work is done.
a
In an electric circuit, the safety fuse is connected to the circuit in A) series. B) parallel. C) either series or parallel.
a
In science, a theory is ------- A) a synthesis of a large body of well-tested knowledge. B) less than a fact. C) unchangeable. D) an educated guess.
a
Like kinds of magnetic poles repel while unlike kinds of magnetic poles A) attract. B) repel also. C) may attract or repel.
a
Materials generally become warmer when light is A) absorbed by them. B) reflected by them. C) transmitted by them. D) all of these E) none of these
a
Moving electric charges will interact with A) an electric field or a magnetic field. B) only a magnetic field. C) only an electric field. D) none of these
a
Outside a magnet, magnetic field lines are conventionally drawn from A) north to south. B) south to north. C) either way
a
Scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid hypothesis, there must be a test for proving it---- A) wrong. B) right.
a
Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a A) north pole. B) south pole. C) north or south pole - no difference really.
a
Sunburns are produced by A) ultraviolet light. B) visible light. C) infrared light. D) all of these E) none of these
a
The atomic number of an element is the same as the number of its A) protons. B) neutrons. C) nucleons. D) neither of these
a
The intensity of cosmic rays bombarding the Earth's surface is largest at the A) poles. B) mid-latitudes. C) equator.
a
The mass of a pet turtle that weighs 10 N is A) about 1 kg. B) about 10 kg. C) about 100 kg. D) about 1000 kg. E) none of these
a
The newton (N) is a unit of A) force. B) mass. C) density. D) inertia.
a
The sources of X-rays and gamma rays, respectively, are A) electron clouds and the atomic nucleus. B) the atomic nucleus and electron clouds. C) both electron clouds. D) both the atomic nucleus. E) none of these
a
Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet? A) 0 B) half the sum of their original momentums C) twice the sum of their original momentums D) impossible to determine without additional information
a
Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. In presence of air-resistance, the ball to reach the ground first is the ---- A) lead-filled ball. B) regular ball. C) same for both
a
When a light beam emerges from water into air, the average light speed A) increases. B) decreases. C) remains the same.
a
When a twirling ice skater brings her arms inward, her rotational speed A) increases. B) decreases. C) remains the same.
a
When the distance between two charges is halved, the electrical force between the charges A) quadruples. B) doubles. C) halves. D) is reduced by 1/4. E) None of the above choices are correct.
a
Which is the following is not a vector quantity? A. Mass B. Weight C. Force D. Acceleration E. None of these
a
Which of the following is fundamentally different from the others? A) sound waves B) X-rays C) gamma rays D) light waves E) radio waves
a
Which pole of a compass needle points to a south pole of a magnet? A) north pole B) south pole C) both of these
a
While an object near the Earth's surface is in free fall, its A) velocity increases. B) acceleration increases. C) mass increases. D) velocity decreases.
a
Your image in a plane mirror is A) virtual. B) real. C) both of these D) neither of these
a
the electrical force between charges is strongest when the charges are a) close together b) far apart c) the electrical fore is constant everywhere
a
A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of A) 0 kg m/s. B) 1 kg m/s. C) 2 kg m/s. D) 5 kg m/s. E) more than 5 kg m/s.
b
A baseball bat is balanced on a fulcrum. The center of gravity of the bat is located A) closer to the handgrip. B) above the fulcrum. C) insufficient information
b
A block of ice sliding down an incline has its maximum speed at A) the top. B) the bottom. C) halfway down. D) difficult to predict without knowing the slope of the incline E) difficult to predict without knowing the coefficient of friction
b
A bullet is fired horizontally from a gun. At the same time a similar bullet is dropped from the same height. The fired bullet will (neglect air-resistance) A) hit the ground first B) hit at the same time as the dropped bullet C) hit the ground second D) never hit the ground
b
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is A) zero. B) doubled. C) quadrupled. D) unchanged.
b
A heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is the A) light rock. B) heavy rock. C) same for both
b
A lunar eclipse occurs when the A) sun passes into Earth's shadow. B) moon passes into Earth's shadow. C) Earth passes into the sun's shadow. D) Earth passes into the moon's shadow
b
A mixture of cyan and yellow pigments appears A) orange. B) green. C) magenta. D) blue. E) blackish brown.
b
A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the A) player's grip on the glove. B) force the glove exerts on the ball. C) friction of the ground against the player's shoes. D) muscular effort in the player's arms. E) none of these
b
A popular swinging-balls apparatus consists of an aligned row of identical elastic balls that are suspended by strings so they barely touch each other. When two balls are lifted from one end and released, they strike the row and two balls pop out from the other end. If instead one ball popped out with twice the speed of the two, this would be a violation of conservation of A) momentum. B) energy. C) both of these D) none of these
b
A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration A) increases. B) decreases. C) remains unchanged regardless of air resistance.
b
According to Newton, the greater the masses of interacting objects, the A) less the gravitational force between them. B) greater the gravitational force between them. C) greater the force between them by the square of the masses.
b
An object at rest near the surface of a distant planet starts to fall freely. If the acceleration due to gravity there is twice that of the Earth, its speed one second later would be A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s.
b
An object following a straight-line path at constant speed A) has a net force acting upon it in the direction of motion. B) has zero acceleration. C) has no forces acting on it. D) none of these
b
An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward (neglecting air-resistance) at an angle instead, its acceleration will be A) 0 g. B) 1 g downward. C) 1 g upward. D) larger than 1 g. E) none of these
b
As more lamps are put into a series circuit, the overall current in the power source A) increases. B) decreases. C) stays the same.
b
Compared to its average speed in air, the average speed of a beam of light in glass is A) more. B) less. C) the same.
b
Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have A) more resistance. B) less resistance. C) the same resistance.
b
Compared to ultraviolet waves, the wavelength of infrared waves is A) shorter. B) longer. C) the same.
b
Different colors are dispersed by a prism because different colors in the prism have different A) frequencies. B) speeds. C) directions. D) energies. E) none of these
b
Electromagnetic waves consist of A) compressions and rarefactions of electromagnetic pulses. B) oscillating electric and magnetic fields. C) particles of light energy. D) high-frequency gravitational waves.
b
Generally speaking, the larger a nucleus is, the greater its A) stability. B) instability. C) neither stability nor instability
b
If an object is raised twice as high, its potential energy will be A) half as much B) twice as much. C) four times as much. D) impossible to determine unless the time is given.
b
If an object moves with constant acceleration, its velocity must A) be constant also. B) change by the same amount each second. C) change by varying amounts depending on its speed. D) always decrease.
b
If an object's mass is decreasing while a constant force is applied to the object, the acceleration A) decreases. B) increases. C) remains the same.
b
If no external forces are acting on a moving object, it will A) continue moving at the same speed. B) continue moving at the same velocity. C) move slower and slower until it finally stops.
b
If the mass of an object does not change, a constant net force on the object produces constant A) velocity. B) acceleration. C) both of these D) neither of these
b
If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is A) less than 10 V. B) 10 V. C) more then 10 V. D) None of the above choices are correct.
b
Inside a freely falling elevator, there would be no A) gravitational force on you. B) apparent weight for you. C) both of these D) none of these
b
It is correct to say that impulse is equal to A) momentum. B) the change in momentum it produces. C) the force multiplied by the distance the force acts. D) velocity multiplied by time.
b
Light is emitted when an electron A) is boosted to a higher energy level. B) makes a transition to a lower energy level. C) neither of these
b
Light will almost always travel from one place to another along a path of least A) distance. B) time. C) effort. D) expense. E) complication.
b
Light will almost always travel from one place to another along a path of least A) distance. B) time. C) effort. D) expense. E) complication.
b
Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is A) at or about 50 N. B) exactly 100 N. C) More information is needed.
b
Magnetic field lines about a current-carrying wire A) extend radially from the wire. B) circle the wire in closed loops. C) Choices A and B are both correct. D) None of the above choices are correct.
b
North pole of magnetic compass needle points to the A) Magnetic North of the Earth B) Magnetic South of the Earth C) Geographic South of the Earth D) None of the above
b
Object and image for a plane mirror lie A) along the same plane. B) equal distances from the mirror. C) at right angles to each other. D) all of these E) none of these
b
The energy of a photon depends on its A) speed. B) frequency. C) amplitude. D) all of these E) none of these
b
The stretching out of time due to motion is called time A) stretching. B) dilation. C) contraction. D) warp. E) expansion.
b
To outside observers, the overall sizes of objects traveling at relativistic speeds are A) larger. B) smaller. C) the same size.
b
To say that an object is electrically polarized is to say A) it is electrically charged. B) its charges have been rearranged. C) its internal electric field is zero. D) it is only partially conducting. E) it is to some degree magnetic.
b
Toss a baseball bat into the air and it wobbles about its A) geometrical center. B) center of mass. C) heavier end.
b
What do electrons have that protons always have in equal magnitude? A) mass B) charge C) energy D) all of these E) none of these
b
What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km? A) less than 1 Hz B) 1 Hz C) more than 1 Hz
b
When a 10-V battery is connected to a resistor, the current in the resistor is 2 A. What is the resistor's value? A) 2 ohms B) 5 ohms C) 10 ohms D) 20 ohms E) more than 20 ohms
b
When a 60-watt light bulb is connected to a 120-volt source the current in the light bulb is A) 0.25 A. B) 0.5 A. C) 2 A. D) 4 A. E) more than 4 A.
b
When a falling object has reached its terminal velocity, its acceleration is A) constant. B) zero. C) g.
b
When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) none of these
b
When ultraviolet light is incident upon glass, atoms in the glass A) are forced into vibration. B) resonate. C) pass the light energy along practically undiminished. D) freely absorb and re-emit most of the ultraviolet light.
b
Whenever the net force on an object is zero, its acceleration A) may be less than zero. B) is zero. C) may be more than zero
b
Which has greater kinetic energy, a car traveling at 30 km/hr or a car of half the mass traveling at 60 km/hr? A) the 30 km/hr car B) the 60 km/hr car C) Both have the same kinetic energy. D) More information is needed about the distance traveled.
b
Your weight is A) equal to your mass. B) the gravitational attraction force between you and the Earth. C) a property of mechanical equilibrium. D) all of these
b
a main difference between gravitational and electrical forces is that electrical forces a) Attract b) repel or Attract c) obey the inverse square law d) act over shorter distances e) are weaker
b
29) Refraction results from differences in light's A) frequency. B) incident angles. C) speed D) all of these E) none of these
c
A 10-N falling object encounters 4 N of air resistance. The net force on the object is A) 0 N. B) 4 N. C) 6 N. D) 10 N. E) none of these
c
A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about -------- A) twice as much. B) half as much. C) the same. D) four times as much.
c
A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is A) greater on the bug. B) greater on the car. C) the same for both.
c
A golfer drives her golf ball from the tee down the fairway in a high arcing shot. When the ball is at the highest point of its flight: A) the velocity and acceleration are both zero B) the x-velocity is zero and the y-velocity is zero C) the x-velocity is non-zero and the y-velocity is zero D) the velocity is non-zero and the acceleration is zero
c
A kilogram is a measure of an object's A) weight. B) force. C) mass. D) size.
c
A man weighing 1000 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is A) 200 N. B) 1000 N. C) 500 N. D) none of these
c
A person is attracted toward the center of Earth by a 500-N gravitational force. The Earth is attracted toward the person with a force of A) zero. B) 250 N. C) 500 N. D) 1000 N.
c
A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the A) air resistance on the ball. B) weight of the ball. C) force that the ball exerts on the bat. D) grip of the player's hand against the ball. E) weight of the bat.
c
A positive ion has more a) electrons than neutrons b) electrons than protons c) protons than electrons d) protons than neutrons e) neutrons that protons
c
A ring, a cylinder, and a solid sphere begin rolling down a hill together. Given that the rotational inertia of the solid sphere is the least and that of the ring is the most , the one to reach the bottom first is the A) ring B) cylinder. C) sphere. D) They all reach the bottom at the same time. E) Not enough information is given
c
A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its vertical component of velocity A) increases. B) remains unchanged. C) decreases.
c
A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is A) less than its weight. B) more than its weight. C) equal to its weight.
c
A single raindrop illuminated by sunshine disperses A) a single color. B) either low-, middle-, or high-frequency colors in most cases . C) all the colors of the rainbow.
c
According to Newton, doubling the distance between two interacting objects A) divides by 2 the gravitational force between them. B) multiplies by 2 the gravitational force between them. C) divides by 4 the gravitational force between them. D) multiplies by 4 the gravitational force between them.
c
According to the special theory of relativity, all laws of nature are the same in reference frames that A) accelerate. B) move in circles. C) move at constant velocity. D) oscillate. E) none of these
c
An apple at rest weighs 1 N. The net force on the apple when it is in free fall is A) 0 N. B) 0.1 N. C) 1 N. D) 9.8 N. E) none of these
c
An iron nail is more strongly attracted to the A) north pole of a magnet. B) south pole of a magnet. C) north or south pole - no difference really.
c
An iron rod becomes magnetic when A) positive ions accumulate at one end and negative ions at the other end. B) its atoms are aligned having plus charges on one side and negative charges on the other. C) the net spins of its electrons are in the same direction. D) its electrons stop moving and point in the same direction. E) none of these
c
Compared to falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the A) carpeted floor provides a smaller impulse. B) stopping time is shorter on the carpet. C) stopping time is longer on the carpet. D) carpet provides a smaller impulse and a longer time.
c
Compared to radio waves, the velocity of visible light waves in a vacuum is A) less. B) more. C) the same.
c
Consider light energy that is momentarily absorbed in glass and then re- emitted. Compared to the absorbed light, the frequency of the re-emitted light is A) considerably less. B) slightly less. C) the same. D) slightly more. E) considerably more.
c
Disregarding air resistance, objects fall with constant A) velocity. B) speed. C) acceleration. D) distances each successive second.
c
Electrons are made to flow in a wire when there is A) an imbalance of charges in the wire. B) more potential energy at one end of the wire than the other. C) a potential difference across its ends.
c
Heat a copper wire and its electric resistance A) decreases. B) remains unchanged. C) increases.
c
If a non-rotating object has no acceleration, then we can say for certain that it is A) at rest. B) moving at constant non-zero velocity. C) in mechanical equilibrium. D) all of these E) none of these
c
If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes A) for the sun to disappear. B) to operate receiving equipment in the dark. C) for light to travel from the sun to the Earth. D) all of these e) none of these
c
In a simple circuit containing a bulb, energy is given to the moving charges by A) the bulb. B) the wires. C) a generator. D) none of these
c
Light travels fastest in A) warm air. B) cool air. C) a vacuum.
c
Magnetism is due to the motion of electrons as they A) move around the nucleus. B) spin on their axes. C) Choices A and B are both correct. D) None of the above choices are correct.
c
Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom ------- A) after the light block. B) before the light block. C) at the same time as the light block.
c
On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in A) parallel. B) perpendicular . C) series. D) haste.
c
Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are A) beyond the main pull of Earth's gravity. B) above the Earth's atmosphere. C) without support forces. D) all of these E) none of these
c
Pigeons navigate primarily by A) a good memory. B) a keen sense of smell. C) magnetic sensors in their heads. D) ultra-high-pitched sounds. E) none of these
c
Rainbows exist because light is A) reflected. B) refracted. C) both of these D) neither of these
c
Stretch a copper wire so that it is thinner and the resistance between its ends A) decreases. B) remains unchanged. C) increases.
c
Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration ? A) 0.25 m/s2 B) 4.0 m/s C) 4.0 m/s2 D) 10 m/s2 E) 40 m/s
c
The acceleration due to gravity acts: A) upward B) depending on the motion of the object C) downward D) toward outer space
c
The atomic mass number of an element is the same as the number of its A) protons. B) neutrons. C) nucleons. D) none of these
c
The brightest color emitted by the sun is A) red. B) orange. C) yellow-green. D) green-blue. E) violet.
c
The center of mass of a human body is located at a point A) that is fixed, but different for different people. B) that is always directly behind the belly button. C) that changes as a person bends over. D) none of these
c
The complementary color of blue is A) red. B) green. C) yellow. D) cyan. E) magenta
c
The current through a 10-ohm resistor connected to a 120-V power supply is A) 1 A. B) 10 A. C) 12 A. D) 120 A. E) none of these
c
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is A) more than 10 N. B) less than 10 N. C) 10 N.
c
The power dissipated in a 4-ohm resistor carrying 3 A is A) 7 W. B) 18 W. C) 36 W. D) 48 W. E) not enough information to say
c
The weight of a 1-kg mass at the Earth's surface is about A) 1 kg. B) 4.9 N. C) 10 N. D) 100 N. E) none of these
c
To receive an electric shock there must be A) current in one direction B) moisture in the electrical device being used C) difference in potential across part or all of body D) None of the above
c
Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be A) F. B) 2 F. C) F/2. D) F/4. E) none of these
c
Two objects have the same size and shape, but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater A) speed. B) acceleration. C) momentum. D) all of these E) none of these
c
What color light is transmitted by a piece of blue glass? A) red B) white C) blue D) yellow E) orange
c
What is the wavelength of an electromagnetic wave that has a frequency of 1 hertz? A) less than 1 m B) 1 m C) more than 1 m
c
What task requires the most work; lifting a 50-kg sack 2 meters or lifting a 25- kg sack 4 meters? A) the 50-kg sack B) the 25-kg sack C) Both require the same amount of work. D) impossible to determine without knowing the contents of the sack
c
When an alpha particle is ejected from a nucleus, the nucleus then has less A) mass. B) charge. C) both of these D) neither of these
c
When you approach a blinking light source which in turn is moving towards you, you perceive an increase in A) both speed and frequency of the light. B) speed, but not frequency of the light. C) frequency of the light, but not speed.
c
Which of these electromagnetic waves has the shortest wavelength? A) radio waves B) infrared waves C) X-rays D) ultraviolet waves E) visible light waves
c
Which radiation has no electric charge associated with it? A) alpha rays B) beta rays C) gamma rays D) all of these E) none of these
c
he reason the moon does not crash into the Earth is that the A) Earth's gravitational field is weak at the moon. B) gravitational pull of other planets keeps the moon up. C) moon has a sufficient tangential speed. D) moon has less mass than the Earth. E) none of these
c
A 5 kg ball has a acceleration of 2 m/s2. The the magnitude of the force responsible for producing this acceleration is A) 3 N B) 4 N C) 10 kg D) 10 N E) none of these
d
A TV set is pushed a distance of 2 m with a force of 20 N. How much work is done on the set? A) 2 J B) 10 J C) 20 J D) 40 J E) 800 J
d
A ball rolling down an incline has its maximum kinetic energy at A) the top. B) halfway down. C) three-quarters of the way down. D) the bottom.
d
A rock is thrown straight up from the surface of the Earth. Which one of the following statements describes the energy transformation of the rock as it rises? Neglect air resistance. A) The total energy of the rock increases. B) The kinetic energy increases and the potential energy decreases. C) Both the kinetic energy and the potential energy of the rock remain the same. D) The kinetic energy decreases and the potential energy increases. E) Both the potential energy and the total energy of the rock increase.
d
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that A) the milk carton has no acceleration. B) there is an action-reaction pair of forces. C) gravity tends to hold the milk carton secure. D) the milk carton has inertia. E) none of these
d
A sheet of red paper will look black when illuminated with A) red light. B) yellow light. C) magenta light. D) cyan light. E) none of these
d
According to Kepler's laws, the paths of planets about the sun are A) parabolas. B) circles. C) straight lines. D) ellipses. E) none of these
d
Amongst the following media, a beam of light travels fastest in A) glass. B) water. C) plastic. D) air. E) is the same in each of these
d
An object in mechanical equilibrium is an object A) at rest. B) moving with constant velocity. C) having no acceleration. D) all of these
d
An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration A) quadruples. B) doubles. C) stays the same. D) halves. E) none of these
d
An object may have potential energy because of its A) speed. B) acceleration. C) momentum. D) position. E) none of these
d
Astronomers can tell whether a star is approaching or receding from Earth by A) its temperature. B) its change in temperature. C) its absorption spectra. D) the Doppler effect. E) all of these
d
Atoms can be excited by A) thermal agitation. B) electron impact. C) photon impact. D) all of these E) none of these
d
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much ---- A) inertia. B) volume. C) mass. D) all of these E) none of these
d
Different colors of light correspond to different light A) velocities. B) intensities. C) polarities. D) frequencies. E) none of these
d
Electric potential and electric potential energy are A) one and the same in most cases B) two terms for the same concept C) BothA&B D) None of these
d
If 0.8 A of current flow through a light bulb connected to a 120 V outlet, the power consumed is A) 12 W. B) 15 W. C) 60 W. D) 96 W. E) 120 W.
d
If you plug an electric toaster rated at 110 V into a 220-V outlet, the current in the toaster will be about A) half what it should be. B) the same as if it were plugged into 110 V. C) more than twice what it should be. D) twice what it should be.
d
In each second of fall, the distance a freely falling object will fall is A) about 5 m. B) about 10 m. C) the same, but not 5 m or 10 m. D) increasing. E) none of these
d
Interference is a property of A) light waves. B) sound waves. C) water waves. D) all of these E) none of these
d
Most of the waves in the electromagnetic spectrum are A) red light. B) blue light. C) green light. D) invisible for humans.
d
The field surrounding every moving electron is A) always magnetic but never electric. B) always electric but never magnetic. C) sometimes magnetic and sometimes electric. D) always both electric and magnetic. E) none of the above
d
The greenish blue of water is evidence for the A) reflection of greenish-blue light. B) reflection of red light. C) absorption of greenish-blue light. D) absorption of red light. E) interaction between green and blue frequencies of light.
d
The half-life of a radioactive substance is INDEPENDENT of A) the number (if large enough) of atoms in the substance. B) whether the substance exists in an elementary state or in a compound. C) the temperature of the substance. D) the age of the substance. E) all of these
d
The half-life on an isotope is one day. At the end of three days, how much of the isotope remains? A) none B) one-half C) one-quarter D) one-eighth E) none of these
d
The highest frequency light of those below is A) red. B) green. C) blue. D) violet. E) all the same
d
The source of all magnetism is A) tiny pieces of iron. B) tiny domains of aligned atoms. C) ferromagnetic materials. D) moving electric charge. E) none of these
d
When a car is struck by lightning, the resulting electric field inside the car is A) normally huge, but for a brief time. B) normally huge for a time longer than the lightning stroke itself. C) small enough to be safe for an occupant inside. D) zero.
d
When a gamma ray is emitted by a nucleus, the nucleus then has appreciably less A) mass. B) charge. C) both of these D) neither of these
d
When an automobile is braked to a stop, its kinetic energy is transformed to A) stopping energy. B) energy of motion. C) energy of rest. D) heat.
d
Which color of light carries the most energy per photon? A) red B) green C) blue D) violet E) all the same
d
While a car travels around a circular track at a constant speed, its A) acceleration is zero. B) velocity is zero. C) inertia is zero. D) none of the above
d
if it takes 100 newtons of force to hold a 0.1-coulomb particle at rest in an electric field, the strength of the field there is A) 1N/C B) 10N/C C) 100N/C D) 1000N/C
d
A red crab very deep in water, where sunlight is dim, appears A) red. B) orange. C) cyan. D) brown. E) no color - black.
e
Light refracts when traveling from air into glass because light A) has greater intensity in air than in glass. B) has greater intensity in glass than in air. C) has greater frequency in air than in glass. D) has greater frequency in glass than in air. E) travels slower in glass than in air.
e
The electric power of a lamp that carries 2 A at 120 V is A) 1/6 watts. B) 2 watts. C) 60 watts. D) 20 watts. E) 240 watts.
e
The main difference between a radio wave and a sound wave is their different A) frequencies. B) wavelengths. C) energies. D) amplitudes. E) modes of travel.
e
The two measurements necessary for calculating average speed are ------ A) distance and acceleration. B) velocity and time. C) acceleration and time. D) velocity and distance. E) distance and time.
e
Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) 16 N.
e
What condition must exist between two points in a conductor in order to maintain a flow of charge? A) a steady magnetic field B) a high resistance C) a switch connected in series D) All of the above choices are correct. E) None of the above choices are correct.
e
