The cooling effect inside a refrigerator is produced by
A) an electric motor that converts electrical energy to internal energy.
B) compressing the refrigeration gas.
C) vaporizing the refrigeration liquid.
D) proper insulation.
E) exchanging warmer air with colder air.
Two objects of the same size, but unequal weights are dropped from a tall tower. Taking
air resistance into consideration, the object to hit the ground first will be the
A) lighter object.
B) heavier object.
C) Both hit at the same time.
D) not enough information
The change in momentum that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a
wall and bounces back at 2.0 m/s is
A) 2 kg m/s.
B) 4 kg m/s.
C) 6 kg m/s.
D) 8 kg m/s.
The pressure at the bottom of a jug filled with water does NOT depend on
A) the acceleration due to gravity.
B) water density.
C) the height of the liquid.
D) surface area of the water.
E) none of the above
When moth balls sublime to gas they
A) absorb energy.
B) release energy.
C) both of these
D) neither of these
An explosion occurs 34 km away. The time it takes for its sound to reach your ears,
traveling at 340 m/s, is
A) 0.1 s.
B) 1 s.
C) 10 s.
D) 20 s.
E) more than 20 s.
If a pizza radiates more energy than it absorbs, its temperature
A) decreases.
B) is unaffected.
C) increases.
D) none of the above
Consider the interference colors in a film of gasoline on a wet street. The water
provides a
A) means of spreading the gasoline into a thin film.
B) means of slowing the rapid evaporation of gasoline.
C) chemical bond with the gasoline.
D) second reflecting surface.
E) all of the above
A device that transforms mechanical energy into electrical energy is a
A) generator.
B) motor.
C) transformer.
D) magnet.
E) none of the above
When light reflects from a surface, there is a change in its
A) frequency.
B) wavelength.
C) speed.
D) all of the above
E) none of the above
What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory
floor against a friction force half its weight?
A) 600 N
B) 1600 N
C) 2000 N
D) 2400 N
E) none of the above
Imagine a single charge q placed at one corner of a square, and that the electric field at
the center of the square is F/q. If two other equal charges are placed at the adjacent
corners of the square (leaving the opposite corner “blank”), the electric field at the
center of the square is
A) F/q.
B) 4F/q.
C) F/(2q).
D) F/(4q).
E) none of the above
Interference effects are less visible for thick films because the reflected waves
A) from the bottom surface are too dim.
B) become too dispersed.
C) are out of phase with one another.
D) are too displaced to interfere.
Stars twinkle when seen from Earth. When seen by an astronaut on the Moon, stars
A) twinkle more.
B) twinkle less.
C) don’t twinkle.
The secondary of a transformer is the coil connected to
A) the load.
B) the Internet.
C) the input power line.
D) none of the above
Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of
rope on frictionless ice. After a brief time, they meet. The heavier person slides a
distance of
A) 3 m.
B) 4 m.
C) 6 m.
D) 0 m.
By scattering alpha particles from gold, Rutherford showed the atomic nucleus to be
very
A) small relative to the atom.
B) massive relative to the mass of an electron.
C) both of these
D) neither of these
Which of the following is not a vector quantity?
A) velocity
B) speed
C) acceleration
D) all are vector quantities
E) none are vector quantities.
To totally convert a given amount of mechanical energy into heat is
A) possible.
B) impossible.
C) need more information
D) none of the above
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.
The kinetic energy of a planet is maximum when it is
A) closest to the Sun.
B) farthest from the Sun.
C) least accelerating.
D) none of the above
To send a beam laser-light beam to a space station just above the atmosphere near the
horizon, aim your laser
A) above your line of sight.
B) below your line of sight.
C) along your line of sight.
In cold weather, your hands will be warmer if you wear
A) gloves.
B) mittens.
C) both the same
To estimate the distance in kilometers of a flash of lightning, count the number of
seconds between seeing the flash and hearing the accompanying thunder, then divide by
A) 2.
B) 3.
C) 4.
D) 5.
E) none of the above
A nucleon is either a
A) positron or an electron.
B) proton or an electron.
C) neutron or an electron.
D) proton or a neutron.
An iron nail is more strongly attracted to the
A) north pole of a magnet.
B) south pole of a magnet.
C) either of these
D) neither of these
The radioactive half-life of a material is the time for
A) half of an original quantity of the material to decay.
B) its decay rate to reduce to half.
C) both of these
D) neither of these
The voltage across the input terminals of a transformer is 120 V. The primary has 25
loops and the secondary has 50 loops. The voltage the transformer delivers is
A) 30 V.
B) 60 V.
C) 120 V.
D) 240 V.
E) none of the above
A fast-moving ball is more easily seen if it is
A) red.
B) orange.
C) yellow-green.
D) green-blue.
E) violet.
The complementary color of blue is
A) red.
B) green.
C) yellow.
D) cyan.
E) magenta.
A heavy ball hangs by a string, with a second string attached to its bottom (Figure 4.8 in
your book). A quick pull on the bottom string breaks the
A) top string.
B) bottom string.
C) top or bottom string equally.
The shortest plane mirror in which you can see your entire image is
A) half your height.
B) about 3/4 your height.
C) about 1/3 your height.
D) equal to your height.
E) dependent on your distance from the mirror.
To multiply an applied force while using a simple hydraulic lift, your force should be
applied to the
A) large-diameter piston.
B) small-diameter piston.
C) relative piston sizes don’t matter.
A mass spectrometer separates
A) ions of different elements.
B) different-mass ions of the same element.
C) different-mass ions of the same speed.
D) all of the above
E) none of the above
When a large floating ice cube with unfrozen water inside melts, the water level in its
container
A) goes down.
B) remains unchanged.
C) goes up.