An object that has kinetic energy must be
A) moving.
B) falling.
C) at an elevated position.
D) at rest.
E) none of the above
Compared to ultraviolet waves, the wavelength of infrared waves is
A) shorter.
B) the same.
C) longer.
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead
we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero.
B) the same as before.
C) small, but noticeable.
When U-235 undergoes fission, the total number of protons in the fragments is
A) 90.
B) 91.
C) 92.
D) 93.
E) none of the above
Which rocket would require more fuel?
A) one going from the Moon to Earth.
B) one going from Earth to the Moon.
C) both the same.
A device that shows the bending of particle trails in liquid hydrogen is a
A) streamer chamber.
B) spark chamber.
C) bubble chamber.
D) all of the above
E) none of the above
An astronaut falling into a black hole would see the universe
A) red-shifted.
B) blue-shifted.
C) with no shift at all.
Scotty Skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration
of about
A) 0.2 g.
B) 0.3 g.
C) 0.4 g.
D) 0.5 g.
E) greater than 0.5 g.
Inside a freely-falling runaway elevator, your
A) acceleration is zero.
B) weight is zero.
C) gravitational interaction with Earth is zero.
D) all of the above
E) none of the above
A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force.
What is the tension in the rope?
A) zero
B) 400 N
C) 600 N
D) 800 N
E) none of the above
The source of a sonic boom
A) must be a sound emitter.
B) may or may not be a sound emitter.
C) is not a sound emitter.
D) none of the above
Compared with a solid steel bar having a rectangular cross-section, an I-beam has the
advantage of
A) being lighter.
B) being stronger per bodyweight.
C) both of these
D) neither of these
When most substances are heated, molecules inside move faster and take up more
space, resulting in thermal
A) bending.
B) expansion.
C) contraction.
D) heat.
The photons having least energy are those of
A) infrared.
B) red light.
C) green light.
D) blue light.
E) ultraviolet.
What can exist in the same place at the same time?
A) two large boulders
B) two tiny boulders
C) two waves
D) all of the above
E) none of the above
Two protons attract each other gravitationally and repel each other electrically. The
stronger of these two forces is
A) gravitation.
B) electrical.
C) neither of these
Reverberation of sound occurs for
A) sound interference.
B) forced vibrations.
C) re-echoed sound.
D) resonance.
E) none of the above
If you drop a bar magnet in a vertical copper pipe it will fall slowly because
A) of air resistance.
B) it induces a magnetic field in the pipe that resists motion of the magnet.
C) the copper is a good conductor of both electricity and magnetism.
D) of electron repulsion.
A car by itself is capable of a certain maximum acceleration. When it tows a car of the
same mass, its maximum acceleration is
A) one half.
B) one third.
C) one fourth.
D) the same.
E) none of these
Nuclear reactors that produce consumer power in present times are powered by
A) fission.
B) fusion.
C) both fission and fusion.
The fundamental frequency of a violin string is 440 hertz. The frequency of its second
harmonic is
A) 220 hertz.
B) 440 hertz.
C) 880 hertz.
D) none of the above
The attraction between like substances, stickiness, is called
A) adhesion.
B) cohesion.
C) depends on the substances.
When we see a half Moon in the sky, the lines between Earth, Moon, and Sun
A) are equal in length.
B) are parallel to one another.
C) form a right triangle.
D) all of the above
When a living cell doubles in diameter, it has eight times the mass to be nourished, and
the amount of membrane through which it feeds is
A) only twice as much.
B) only four times as much.
C) also eight times as much.
D) more than eight times as much.
If the temperature of a sample of water at 4oC is slightly lowered, its volume
A) increases.
B) decreases.
C) remains the same.
The natural background radiation we personally encounter is
A) a trace amount.
B) about a quarter.
C) about half.
D) more than half.
The end of a compass needle that points to the south pole of a magnet is the
A) north pole.
B) south pole.
C) both of these
When sunlight from air enters water, light that refracts most is
A) red.
B) orange.
C) green.
D) violet.
E) all refract the same amount
A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same
direction has a speed of
A) 0 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
A water-filled paper cup held in a flame will not catch fire. This is because
A) the inside of the paper is wet.
B) water is an excellent conductor of heat.
C) paper is a poor conductor of heat.
D) the paper cup cannot become appreciably hotter than the water it contains.
Lobsters live on the bottom of the ocean, which means their density is
A) greater than the density of sea water.
B) equal to the density of sea water.
C) less than the density of sea water.
You drive your car at a constant 60 km/h along the highway. You apply the brakes until
the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car
tends to
A) momentarily regain its higher initial speed.
B) continue moving at 40 km/h.
C) decrease in speed if no other forces act.
A very lightweight horizontal loop of wire is suspended from a fine spring, lowered into
water, and then raised to the surface. Any further attempt to raise it causes the spring to
A) stretch.
B) contract.
C) stay the same.