Radiation dosages based on potential damage is in
A) rads.
B) rems.
C) joules.
D) none of the above
Answer:
It would be easier to pull the evacuated Magdeburg hemispheres apart if they were
A) held upside down.
B) at sea level.
C) 20 km beneath the ocean surface.
D) 20 km above the ocean surface.
E) none of the above
Answer:
The amount of force needed to sustain motion of a rock in outer space is
A) a force equal to its weight.
B) a force less than its weight if friction is absent.
C) none of these
Answer:
A measuring stick on a rapidly rotating disk will not appear to shrink if it is oriented
along the
A) circumference.
B) radius.
C) either of these
D) neither of these
Answer:
When two lamps are connected in series 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
Answer:
According to Huygens’ principle, every point on a wave
A) is a diffraction source.
B) behaves as a source of new waves.
C) is the superposition of every other part of the wave.
D) all of the above
E) none of the above
Answer:
The Bohr model of the atom is akin to a
A) miniature solar system.
B) blob of plum pudding, where raisins represent electrons.
C) central heavy ball with lighter balls connected by springs.
D) all of the above
Answer:
If you move in the direction in which gravity acts, an observer at rest sees your watch
running
A) slower than at your starting point.
B) faster than at your starting point.
C) neither of these
Answer:
A pair of equal-length vectors at right angles to each other have a resultant. If the angle
between the vectors is less than 90o, their resultant is
A) less.
B) the same.
C) greater.
Answer:
Which equation is correct for wave speed?
A) wave speed = frequency x wavelength
B) wave speed = (1/period) x wavelength
C) both of these
D) neither of these
Answer:
A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track.
They collide and stick. The combined mass moves at
A) 0 m/s.
B) 1/2 m/s.
C) 1/3 m/s.
D) 1/6 m/s.
E) 1.5 m/s.
Answer:
When Rutherford directed a stream of alpha particles at a gold foil, some particles
A) bounced back.
B) continued through the foil.
C) deflected at a variety of angles.
D) all of the above
E) none of the above
Answer:
Heavy atoms are not appreciably larger in size than light atoms because the nuclei of
heavy atoms have more
A) mass.
B) electric charge.
C) nucleons.
D) all of the above
E) none of the above
Answer:
Refraction occurs when light passing from one medium to another
A) changes frequency.
B) changes speed.
C) loses energy.
D) reflects inward.
Answer:
In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the
greatest average speed are those of
A) hydrogen.
B) oxygen.
C) nitrogen.
D) all the same
Answer:
Two projectiles are fired from ground level at equal speeds but different angles. One is
fired at an angle of 30 and the other at 60. Neglecting air resistance, the projectile to hit
the ground first will be the one fired at
A) 30.
B) 60.
C) both hit at the same time
Answer:
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.
Answer:
If the energy levels in the neon atom were not discrete, neon signs would glow
A) red.
B) white.
C) blue.
Answer:
Compared with special relativity, general relativity is more concerned with
A) acceleration.
B) gravitation.
C) spacetime geometry.
D) all of the above
E) none of the above
Answer:
A mobile phone is pulled northward by a force of 10 N and at the same time pulled
southward by another force of 15 N. The resultant force on the phone is
A) 0 N.
B) 5 N.
C) 25 N.
D) 150 N.
Answer:
The LEDs that make up the color on some TV screens are
A) red, blue, yellow.
B) red, blue, green.
C) yellow, blue, green.
D) magenta, cyan, yellow.
E) red, green, yellow.
Answer:
Light bends when it
A) closely passes a star.
B) closely passes the Moon.
C) both of these
D) neither of these
Answer:
The main reason a person weighs less at the equator than at the poles involves the
A) spin of the Earth.
B) influence of the Sun, Moon, and all the planets.
C) law of action and reaction.
Answer:
A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the
bottom first?
A) ring
B) disk
C) sphere
D) all reach the bottom at the same time
E) need more information
Answer:
When long-wavelength light is seen in the interference colors of a soap bubble, the
wavelength being cancelled is relatively
A) long.
B) short.
C) neither of these
Answer:
When the distance between two stars decreases by one-third, the force between them
A) decreases by one-third.
B) decreases by one-half.
C) increases to twice as much.
D) increases to nine times as much.
E) none of the above
Answer:
To a fair approximation, Early Greeks knew the
A) size of Earth.
B) size of the Moon.
C) Earth-Moon distance.
D) all of the above
Answer:
Plane waves incident upon a barrier that pass through a small opening
A) continue as plane waves.
B) fan out.
C) converge.
D) become polarized.
E) all of the above
Answer:
Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters
in the same time. The power expended in raising the 50-kg sack is
A) twice as much as the 25-kg sack.
B) half as much as the 25-kg sack.
C) the same.
D) need more information
Answer:
Comparing the light from a glowing tube of neon gas and the beam of a helium-neon
laser, there is a greater number of spectral lines in light from the
A) neon gas tube.
B) laser beam.
C) both about the same
Answer:
The weight of air in a bathtub (about 1/3 cubic meter) is about the same as the weight of
A) a pea.
B) an egg.
C) a small apple.
D) a pound of butter.
E) a 10-pound sack of potatoes.
Answer:
A cart maintains a constant velocity of 100 m/s for 10 seconds. During this interval its
acceleration is
A) zero.
B) 1 m/s2.
C) 10 m/s2.
D) none of the above
Answer:
Which tin can will roll down an incline in the shortest time, one filled with water or one
filled with ice? (Hint: water ‘slides’ inside the can.)
A) with water
B) with ice
C) both the same
D) need more information
Answer:
The fact that more radioactive particles are spewed from coal-fired power plants than
nuclear fission reactors is evidence that
A) coal is more radioactive than uranium.
B) coal-fired plants have less shielding.
C) coal-fired plants are more numerous.
D) all of the above
E) none of the above
Answer:
When a current-carrying wire is bent into a loop, its magnetic field inside the loop
A) weakens.
B) becomes concentrated.
C) cancels.
D) none of the above
Answer:
Figure E-1
A marble rolls back and forth along the path shown. When it is at position B, its kinetic
energy is
1) maximum,
2) minimum,
3) midway between maximum and minimum,
its momentum is
4) maximum,
5) minimum,
6) midway between maximum and minimum,
and its potential energy is
7) maximum.
8) minimum.
9) midway between maximum and minimum.
Answer:
In a series circuit of three identical lamps powered by a 1.5-volt dry cell, the voltage
across each lamp is
1) 1/2 V.
2) 1 V.
3) 1-1/2 V.
If any one of the lamps is disconnected, the other lamps will
4) go out.
5) continue to glow.
Answer:
The source of electrons lighting common lamps in your classroom is
1) the power company,
2) the electrical outlet,
3) atoms in the lamp filament,
4) the wires leading to the lamp,
whereas the source of energy that lights a common lamp in your home is
5) the power company.
6) the electrical outlet.
7) atoms in the bulb filament.
8) the wires leading to the lamp.
Answer:
Figure A-1
Refer to the figure above. Assuming that all transitions between levels are possible, how
many spectral lines will this atom exhibit?
1) 1
2) 2
3) 3
4) 4
5) 5
The spectral line of highest frequency will result from an electron transition from n = 3
to
6) n = 2.
7) n = 1.
8) either, if the levels are equidistant.
Answer:
Neglecting all types of friction, if two identical sleds, one empty and the other with four
heavy passengers, start sliding down a hill together, the heavier sled will get to the
bottom
1) before the empty car,
2) after the empty car,
3) at the same time as the empty car,
while in the presence of air resistance, the heavier car will get to the bottom
4) before the empty car.
5) after the empty car.
6) at the same time as the empty car.
Answer:
A boulder is thrown into a deep lake. As it sinks deeper and deeper in the water the
buoyant force
1) increases.
2) decreases.
3) remains the same.
This is because the
4) pressure increases with greater depth.
5) pressure decreases with greater depth.
6) volume and weight of displaced water are the same at any depth.
Answer:
The principal difference between a gas and a plasma has to do with
1) the kinds of elements involved,
2) interatomic spacing,
3) electrical conduction,
4) fluid pressure,
5) the proportion of antimatter,
while the principal difference between a liquid and a gas has to do with
6) the kinds of elements involved.
7) interatomic spacing.
8) electrical conduction.
9) fluid pressure.
10)the proportion of antimatter.
Answer:
Which has a greater buoyant force?
1) a huge lead zeppelin
2) a small helium-filled balloon
3) both
4) neither
because
5) of its low density.
6) it occupies the greatest amount of space.
7) it occupies the least amount of space.
8) both have comparable densities.
Answer:
Which of the following has the greater weight?
1) 1 kilogram of gold
2) 1 kilogram of feathers
3) both weigh the same in the same locality
This follows from the fact that
4) gold is more compact than feathers.
5) weight and mass are directly proportional to each other.
Answer:
Figure E/M-3
Refer to the figure above. When the switch is closed in the primary circuit,
1) voltage is established in the primary coil
2) a current is established in the primary coil
3) a magnetic field builds up around the primary coil
4) all of the above
and a voltage is induced in the secondary circuit principally because
5) of the voltage in the primary.
6) of the change of current in the primary.
7) the expanding magnetic field about the primary is sensed by the secondary.
Answer:
Figure E-4
The center of gravity for each truck is marked X. Which truck(s) will tip over?
1) Truck 1
2) Truck 2
3) Truck 3
4) All will tip.
This is because
5) its center of gravity is highest.
6) its center of gravity is lowest.
7) its center of gravity lies beyond a point of support.
8) all the centers of gravity lie above the wheelbases.
Answer:
Which of the following contracts the most when temperature is decreased?
1) iron
2) ice water
3) helium
4) All contract the same.
Which of the following contracts the most when temperature is increased?
5) iron
6) ice water
7) helium
8)All contract the same.
Answer:
Ohm’s law tells us that the amount of current produced in a circuit is
1) directly proportional to voltage.
2) inversely proportional to resistance.
3) both of these
which means that current in a conductor can be increased by
4) increasing the voltage across it.
5) reducing its resistance.
6) both of these
D) none of the above
Answer:
A satellite in an elliptical orbit travels at a
1) constant speed
2) variable speed
3) not enough information to say
because
4) the net force acting on it is zero.
5) of the component of gravitational force existing in its direction of motion.
6) it is characteristic of it to do so.
7) again, not enough information is given to say.
Answer:
Orbital electrons do not spiral into the atomic nucleus because of
1) electrical forces,
2) the wave nature of the electrons,
3) angular momentum,
4) the discreteness of energy levels,
5) quantum mechanical laws,
and the electrons have discrete radii from the nucleus because
6) the circumference of each orbit is an integral multiple of the electron wavelength.
7) electrical forces act over discrete distances.
8) energy levels themselves are discrete.
Answer:
When an ice cube in a glass of water melts, the water level will
1) rise.
2) fall.
3) remain the same.
If the floating ice cube contains a chunk of iron, during melting the water level will
4) rise.
5) fall.
6) remain the same.
Answer: