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In our part of the universe, antimatter is
A) non-existent.
B) plentiful.
C) short-lived.
D) long-lived.
Answer:
Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the
spring is
A) the wall pulling oppositely on the spring.
B) the spring pulling on Harry.
C) both the wall and the spring pulling on Harry.
D) none of the above
Answer:
Magnetism is due to the motion of electrons as they
A) move around the nucleus.
B) spin on their axes.
C) both of these
D) neither of these
Answer:
The concept of pressure involves both
A) force and volume.
B) force and area.
C) area and volume.
Answer:
A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the
water leaves the west bank. To land at a point due east of its starting point, the boat
must be pointed
A) northeast.
B) east.
C) southeast.
D) nowhere"it can't be done.
Answer:
A uranium atom is 238 times as massive as a hydrogen atom. Compared with the
diameter of a hydrogen atom, uranium's size is
A) slightly smaller.
B) only slightly larger.
C) is much larger, but less than 238 times as large.
Answer:
A magnetic field is applied to a cloud chamber for the purpose of
A) attracting electrons.
B) repelling electrons.
C) attracting protons.
D) all of the above
E) none of the above
Answer:
Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can
be
A) wrapped in newspaper.
B) drained of water periodically.
C) kept away from the food.
D) broken into smaller pieces.
E) none of the above
Answer:
The induced electric and magnetic fields of Maxwell are
A) parallel to each other.
B) perpendicular to each other.
C) non-directional.
Answer:
Part of a wooden ancient ship is found to be 1/3 as radioactive as wood freshly cut from
a tree. The age of the ship is likely about
A) one-third of carbon-14's half-life.
B) three times carbon-14's half-life.
C) more than three times carbon-14's half-life.
D) none of the above
Answer:
Human hearing is best in
A) infrasonic sound.
B) ultrasonic sound.
C) both of these
D) neither of these
Answer:
The efficiency of classroom-demonstration lasers is typically
A) about one percent.
B) about ten percent.
C) about twenty percent.
D) more than twenty percent.
Answer:
Your pet hamster sits on a record player that has constant angular speed. If the hamster
moves to a point twice as far from the center, then its linear speed
A) doubles.
B) halves.
C) remains the same.
Answer:
It there were no gravity a stone thrown upward at 45 degrees would follow a
straight-line path. But because of gravity, at the end of 1 second, the stone is actually
A) 5 m below the straight line.
B) 10 m below the straight line.
C) 15 m below the straight line.
Answer:
Alternating current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these
Answer:
Which of these vary for satellites in elliptical orbits?
A) speed.
B) momentum.
C) kinetic energy.
D) all of the above
E) none of the above
Answer:
The phenomenon easily explained only in terms of the particle model of light is
A) reflection.
B) refraction.
C) photoelectric effect.
D) diffraction.
E) none of the above
Answer:
The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in
California, at this moment is
A) below 4oC.
B) 4oC.
C) above 4oC.
D) uncertain.
Answer:
An umbrella tends to move upwards on a windy day principally because
A) trapped air under the umbrella, warms, and rises.
B) buoyancy increases with increasing wind speed.
C) air pressure is reduced over the curved top surface.
D) all of the above
Answer:
The electric field established by a battery in a dc circuit
A) increases via the inverse-square law.
B) changes magnitude and direction with time.
C) acts in one direction.
D) is non-existent.
E) none of the above
Answer:
The pupil of your eye is a net
A) absorber of radiant energy.
B) emitter of radiant energy.
C) reflector of radiant energy.
D) none of the above
Answer:
Temperature is most closely related to molecular
A) kinetic energy.
B) potential energy.
C) electrical energy.
D) mechanical energy in general.
Answer:
More efficient gasoline engines could be built if they could withstand
A) greater rotational rates.
B) lower temperatures.
C) higher temperatures.
D) none of the above
Answer:
The critical angle for a transparent material is the angle at and beyond which all light
within the material at its upper surface is
A) refracted.
B) reflected.
C) absorbed.
D) dispersed.
E) diffused.
Answer:
An electrically charged atom is an
A) ion.
B) isotope.
C) both of these
D) neither of these
Answer:
Pour two liters of water at 40oC into one liter of water at 20oC and the final temperature
of the two becomes
A) less than 30o C.
B) at or about 30oC.
C) more than 30oC.
Answer:
Human damage is usually highest for radiation by
A) beta particles.
B) alpha particles.
C) either of the above
D) none of the above
Answer:
Glass in a florist's greenhouse acts as a one-way valve in that it
A) lets light energy flow only in one direction.
B) cuts off unwanted radiation.
C) allows high-frequency waves in and blocks low-frequency waves exiting.
D) is transparent only to lower-frequency waves.
Answer:
A 1-kg rock is suspended from the tip of a horizontal meterstick at the 0-cm mark so
that the meterstick barely balances like a seesaw when its fulcrum is at the 25-cm mark.
From this information, the mass of the meterstick is
A) 1/4 kg.
B) 1/2 kg.
C) 3/4 kg.
D) 1 kg.
E) none of the above
Answer:
In the photoelectric effect, the brighter the illuminating light on a photosensitive
surface, the greater the
A) number of ejected electrons.
B) velocity of ejected electrons.
C) both of these
D) neither of these
Answer:
Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the
Moon as it is here on Earth because
A) the mass of the car is independent of gravity.
B) the weight of the car is independent of gravity.
C) both of these
D) neither of these
Answer:
Doubling the linear size of an object multiplies its area by
A) 2 and its volume by 4.
B) 4 and its volume by 8.
C) 8 and its volume by 16.
D) none of the above
Answer:
Two identical buckets are filled to the brim, one with water and the other with alcohol.
The liquid pressure at the bottom of the bucket of water is
1) less than the pressure at the bottom of the bucket of alcohol.
2) more than the pressure at the bottom of the bucket of alcohol.
3) equal to the pressure at the bottom of the bucket of alcohol.
This is because
4) both containers are of the same volume.
5) alcohol is less dense than water.
6) both containers are filled to the same depth.
Answer:
The net force that acts on a 100-N freely falling body is
1) zero,
2) 9.8 N,
3) 100 N,
and its acceleration is
4) zero.
5) 9.8 m/s2.
6) 100 m/s2.
Answer:
When you throw a stone horizontally from the top of a cliff at 10 m/s, one second after
leaving your hand its vertical distance below the top of the cliff is
1) 5 m.
2) 10 m.
3) 15 m.
And its speed at that instant is
4) 10 m/s.
5) about 14 m/s.
6) 15 m/s.
7) greater than 15 m/s.
Answer:
The force that holds atoms together to form molecules is
1) electric,
2) magnetic,
3) gravitational,
4) nuclear,
and the force that holds the protons in a nucleus together is
5) electric.
6) magnetic.
7) gravitational.
8) nuclear.
Answer:
As a particle is accelerated to relativistic speeds, laboratory measurements of its
momentum show
1) an increase,
2) a decrease,
3) no change,
and measurements of its volume show
4) an increase.
5) a decrease.
6) no change.
Answer:
Heat from the Sun gets to Earth by the process of
1) osmosis.
2) radiation.
3) molecular movement.
4) convection.
5) conduction.
When sunlight reaches Earth, it becomes
6) internal energy.
7) solar energy.
8) electromagnetic radiation.
Answer:
In a 120-volt circuit, 120 joules of
1) charge move each second, which makes up the current,
2) energy are given to each unit of charge that makes up the current,
3) energy are given to each unit of resistance in the circuit,
and if the current is 1 ampere, then
4) 1 unit of charge per second passes any point in the circuit.
5) 120 units of charge per second pass any point in the circuit.
6) the resistance of the circuit is 1 ohm.
Answer:
According to the equation Ft = change in (mv), a foam rubber dashboard is safer than a
metal one, for the force of impact, F, of an occupant against the dash is lessened in an
accident. In this case, the "m" in this equation represents the
1) mass of the car,
2) mass of the person,
3) momentum of the car,
4) momentum of the person,
and the "v" represents the
5) velocity of the car.
6) speed at which the person hits the dashboard.
7) relative velocity between cars in a collision.
8) change in velocity, which is 10 m/s2.
Answer:
Refer to the figure above. Suppose that an electron makes a transition from n = 3 to n =
2 and emits a photon of frequency 4 1014 Hz. Then an electron that makes a transition
from n = 3 to n = 1 may emit a photon with a frequency of
1) 1 1014 Hz,
2) 3 1014 Hz,
3) 4 1014 Hz,
4) 9 1014 Hz,
which is consistent with emission of the most energetic photon from a transition from n
= 3 to
5) n = 1.
6) n = 2.
7) either, as both transitions are equivalent.
Answer:
A horizontal 100-N force exerted against a 1000-N block causes the block to slide on a
level surface with constant velocity. The friction force on the block must be
1) zero.
2) 100 N.
3) 1000 N.
4) greater than 1000 N.
In this case the pushing force and the friction force are
5) equal but oppositely directed.
6) an action-reaction pair.
7) both of these.
8) none of these.
Answer:
A bird sitting on a bare high-voltage wire is not electrocuted because
1) of the high resistance of its body.
2) of no electrical potential difference across its body.
3) its body is at a low electric potential compared to the wire.
4) the high voltage across its feet produces a very small current.
If the bird stood on the wire with only one foot, it would
5) be electrocuted.
6) remain unharmed.
Answer:
Jocko the clown at the top of a tall flagpole has considerable potential energy relative to
the circus net below. After stepping off the pole and neglecting air resistance, his
potential energy when he is half way to the net is
1) the same as at the top,
2) one quarter the amount at the top,
3) one half the amount at the top,
4) more than one-half the amount at the top,
and compared to his kinetic energy when meeting the net, his kinetic energy at the
half-way point is
5) one half.
6) the same as his potential energy at the half-way point.
7) both of these
8) neither of these
Answer:
A woman standing on the surface of Earth has a mass of 70 kg and a weight of 700 N. If
instead she is floating freely inside a non-rotating space habitat far from Earth, her mass
would be
1) less than 70 kg
2) 70 kg
3) more than 70 kg
and her weight would be
4) less than 700 N.
5) 700 N.
6) more than 700 N.
Answer:
When a molecule collides with another that is approaching with greater momentum, its
rebound speed
1) stays the same,
2) increases,
3) decreases,
and when a molecule collides with another that is receding, its rebound speed
4) stays the same.
5) increases.
6) decreases.
Answer:
Consider the fictional case of the incredible shrinking man. If his height shrinks to
one-tenth, his area shrinks to
1) 1/10,
2) 1/100,
3) 1/1000,
4) 1/10,000,
5) none of these,
and his weight would shrink to
6) 1/10.
7) 1/100.
8) 1/1000.
9) 1/10,000.
10)none of these.
Answer:
