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Ninety percent of light incident on a certain piece of glass passes through it. How much
light passes through two pieces of this glass?
A) 80%
B) 81%
C) 85%
D) 89%
E) 90%
A solar eclipse occurs when the
A) Sun passes into Earth's shadow.
B) Moon passes into Earth's shadow.
C) the Moon's shadow is cast on Earth.
D) none of the above
The main source of Earth's natural heat is
A) molten-hot lava.
B) pressure on Earth's interior.
C) radioactivity in Earth's interior.
D) solar energy in the form of fossil fuels.
Sound travels faster in air if the air temperature is
A) warm.
B) cold.
C) average.
D) any of the above
When ice water at 0C is heated
A) thermal expansion occurs.
B) thermal contraction occurs.
C) both occur until 4C is reached
Complementary colors are two colors that
A) blend together.
B) are additive primary colors.
C) produce white light when subtracted.
D) produce white light when added.
E) are right for each other.
Most of the radioactivity we personally encounter originates from
A) fallout from testing of nuclear weapons.
B) nuclear power plants.
C) medical X-rays.
D) the natural environment.
According to Einstein, events that are simultaneous in one frame of reference
A) are simultaneous in all frames of reference.
B) are not simultaneous in other frames of reference.
C) may or may not be simultaneous in other frames of reference.
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
The center of a long uniform log is raised to shoulder level while the other end is on the
ground. If instead, the end of the log is raised to shoulder level, the work required is
A) half.
B) the same.
C) twice.
Both black and white road surfaces absorb sunlight. The warmer road surface at the end
of a sunny day is the
A) black surface.
B) white surface.
C) neither of these
The temperature of outer space is
A) zero.
B) about 2.7 kelvin.
C) meaningless.
D) none of the above
An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a
vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of
A) 1 N.
B) 2 N.
C) 3 N.
D) 4 N.
E) 5 N.
Nellie Newton pulls her sled by a rope that is 45o to the horizontal. The horizontal and
vertical components of force are
A) equal in magnitude.
B) each about 0.7 times the force she exerts on the rope.
C) both of these
D) neither of these
Vibrating air columns relate to which instrument?
A) guitar
B) harp
C) trumpet
D) all of the above
E) none of the above
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.
When a gas in a container expands to twice its volume, its density
A) halves.
B) doubles.
C) quadruples.
D) remains the same.
Atmospheric refraction makes the daylight hours a bit
A) longer.
B) shorter.
C) longer in summer but shorter in winter.
The first to be credited with the idea that energy was quantized was
A) Max Planck.
B) Albert Einstein.
C) both Planck and Einstein at about the same time.
The equilibrium rule applies to
A) vector quantities.
B) quantities that are equal in magnitude.
C) scalar quantities.
D) any kind of quantities.
Which of these is a longitudinal wave?
A) sound
B) light
C) radio
D) all of the above
E) none of the above
Earth's atmosphere gets most of its heat from the
A) Sun.
B) Earth's core.
C) both of these
D) neither of these
If three primary colors of light shine on a white wall and produce a white spot, the
primaries must be
A) additive.
B) subtractive.
C) multiplicative.
D) divisive.
A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the
car?
A) 500 N
B) 1000 N
C) 1500 N
D) 2000 N
E) none of these
Analog sound signals are produced by
A) phonograph records.
B) CDs.
C) DVDs.
D) all of the above
E) none of the above
The mass of a pet turtle that weighs 10 N is about
A) 1 kg.
B) 10 kg.
C) 100 kg.
D) 1000 kg.
E) none of the above
In terms of transferring heat, red-hot wooden coals
A) conduct quite well.
B) conduct poorly.
C) radiate poorly.
D) convect poorly.
A flywheel's diameter is twice that of another of the same shape and mass. Rotational
inertia of the larger flywheel is
A) two times greater.
B) four times greater.
C) the same as the other's.
D) half.
A photosensitive surface is illuminated with both blue and violet light. The light that
causes the greater number of ejected electrons is
A) blue light.
B) violet light.
C) both eject equal numbers.
D) need more information
If you quickly run toward the orchestra at a concert, the frequency of the sound you
hear will be
A) decreased.
B) increased.
C) neither of these
