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The brightest color in sunlight is
A) red.
B) yellow.
C) yellow-green.
D) green.
E) violet.
Entropy is a measure of
A) messiness.
B) disorder.
C) both of the above
D) none of the above
In a spaceship with an acceleration more than g far from gravitational influences, with
the effort it takes on Earth to do 20 pushups, you could comfortably do
A) less than 20 pushups.
B) 20 pushups.
C) more than 20 pushups.
The work done in pushing a TV set a distance of 2 m with an average force of 20 N is
A) 2 J.
B) 10 J.
C) 20 J.
D) 40 J.
E) 800 J.
The minimum amount of steam at 100oC needed to melt 1 gram of 0oC ice is
A) 0.125 gram.
B) 0.148 gram.
C) 6.75 grams.
D) 8 grams.
E) none of the above
Aluminum has a higher specific heat capacity than iron. This means that for equal
masses of aluminum and iron, the metal that heats more quickly when the same amount
of heat is applied is
A) aluminum.
B) iron.
C) need more information
Electric potential, measured in volts, is the ratio of electric energy to the amount of
electric
A) current.
B) resistance.
C) charge.
D) voltage.
E) none of the above
The long, heavy tail of a spider monkey enables the monkey to easily vary its
A) weight.
B) momentum.
C) inertia.
D) center of gravity.
E) none of the above
If the temperature of a sample of water at 0oC is slightly increased, its volume
A) increases.
B) decreases.
C) remains the same.
Compared to a sound of 40 decibels, the intensity of a sound of 50 decibels is
A) 10 times as much.
B) 100 times as much.
C) 1000 times as much.
D) 10,000 times as much.
E) more than 10,000 times as much.
The power required to exert 4-N force over 3 meters in 2 seconds is
A) 4 W.
B) 6 W.
C) 8 W.
D) 12 W.
E) none of the above
Which of these units of temperature is larger?
A) a Celsius degree
B) a Kelvin
C) both are the same size
D) none of the above
Wobbles in the path of Uranus led to the discovery of
A) Jupiter.
B) Mars.
C) Neptune.
D) all of the above
E) none of the above
A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W
lamp is
A) less.
B) greater.
C) the same.
Blow on your hand with your mouth open. Then do the same with your lips puckered
and you'll find
A) a difference in temperatures.
B) the breath from puckered lips is cooler.
C) both of these
D) neither of these
Very low-intensity light passing through a double slit produces a pattern that
A) is built up one photon at a time.
B) reveals which slit each photon passed through.
C) changes only in intensity as time passes, not in detailed structure.
A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000
N. What is the jet's acceleration when taking off?
A) 0.25 m/s2
B) 1 m/s2
C) 2 m/s2
D) 4 m/s2
E) none of the above
A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What
is its volume?
A) 0.33 cubic meters
B) 3 cubic meters
C) 5 cubic meters
D) 15 cubic meters
E) none of the above
Communications and weather satellites always appear at the same place in the sky,
because these satellites are
A) beyond the pull of Earth's gravitational field.
B) moving at a speed just short of escape velocity.
C) orbiting Earth with a 24-hour period.
D) stationary in space.
E) none of the above
You stand on your skateboard and exert a 50-N push on the wall next to you. If your
mass is 60 kg you'll momentarily accelerate from the wall at about
A) 0.08 m/s2.
B) 0.8 m/s2.
C) 8.0 m/s2.
D) none of the above
Artificially induced radioactive elements generally have
A) long half-lives.
B) short half-lives.
C) no half-lives.
No net force acts on a loop of wire in a magnetic field when
A) no current is in the loop.
B) no magnetic field lines pass through the loop.
C) both of these
D) neither of these
In the equation E = hf, the symbol E stands for
A) excitation.
B) efficiency.
C) energy.
D) all of the above
When a bimetallic bar made of copper and iron strips is heated, the bar bends toward
the iron strip. The reason for this is
A) iron gets hotter before copper.
B) copper gets hotter before iron.
C) copper expands more than iron.
D) iron expands more than copper.
E) none of the above
How fast would a light beam appear to Einstein if he were traveling in the same
direction at 90% of the speed of light?
A) 0
B) c
C) 0.1c
D) 1.10c
E) none of the above
The loudness of a sound is most closely related to its
A) speed.
B) frequency.
C) wavelength.
D) intensity.
At equilibrium on a bathroom weighting scale, the downward pull of gravity on you is
balanced by
A) your weight.
B) an upward support force.
C) your mass.
The distance traveled by a wave during a single period is
A) one-half wavelength.
B) one wavelength.
C) two wavelengths.
D) none of the above
The Bernoulli effect causes fast-moving vans on the highway to be drawn together
when
A) air speeds up in passing between them.
B) air between them stagnates.
C) they experience lift.
D) all of the above
Open spaces in ice crystals contribute to
A) decreased density.
B) increased density.
C) neither of these
At the same temperature, which has greater average speed in the air?
A) very light molecules
B) heavier molecules
C) both have equal average speeds.
Two vertical tubes of equal cross-sectional areas are filled with liquids to heights
producing atmospheric pressure at their bottoms. One liquid is water and the other is
mercury. Both liquids have equal
A) volumes.
B) densities.
C) weights.
D) viscosity.
E) none of the above
When the temperature of a solid block of ice is lowered, its volume
A) increases.
B) decreases.
C) stays the same.
Compared with hang time on Earth, hang time on the Moon would be
A) less.
B) the same.
C) greater.
Iron absorption lines that occur in the solar spectrum indicate that iron exists in the
solar
A) atmosphere.
B) surface.
C) interior.
D) none of the above
