The discreteness of energy levels is best understood by considering the electrons to be
A) like tiny planets orbiting a sun.
B) attached to the nucleus by massless springs.
C) much less massive than the nucleus.
D) all of the above
E) none of the above
If a material is heated until it is green hot, then
A) it would liquefy immediately.
B) it would be hotter than white hot.
C) its molecules would be vibrating at nearly identical rates.
D) it would be a strong absorber of red light.
E) energy conservation would be violated.
The wavelengths of sound that carry farther in air are relatively
A) long.
B) short.
C) ultrasonic.
D) none of the above
On a planet where atmospheric gases are red, distant dark mountains would appear
A) bluish.
B) greenish.
C) yellowish.
D) reddish.
E) untinted.
Compared to the diameter of a zirconium atom (A = 40), the diameter of a mercury
atom (A = is approximately
A) four times as large.
B) twice as large.
C) the same size.
D) one-half as large.
E) one-quarter as large.
Which of the following is a property of light waves and NOT of sound waves?
A) frequency
B) wavelength
C) amplitude
D) polarization
E) none of the above
The darkness of clouds is due to
A) absorption.
B) often being in the shadow of another cloud.
C) both of these
D) neither of these
The production of interference colors requires
A) a reflecting surface.
B) at least two reflecting surfaces.
C) a medium with a relatively low index of refraction.
D) none of the above
If an elephant grows proportionally to twice its height, its weight would be multiplied
by about
A) 2.
B) 4.
C) 6.
D) 8.
E) none of the above
What is the total number of individual atoms in a water molecule?
A) one
B) two
C) three
D) four
E) none
The quantity of heat that a substance can transfer relates to its
A) mass
B) specific heat capacity
C) change in its temperature.
D) all of the above
A dome-shaped house is more heat efficient than a rectangular house because a dome
has
A) no corners to radiate.
B) less interior space.
C) less area compared to its volume.
D) all of the above
E) none of the above
The LEDs that make up the color on some TV screens are
A) red, blue, yellow.
B) red, blue, green.
C) yellow, blue, green.
D) magenta, cyan, yellow.
E) red, green, yellow.
Suppose a particle is being accelerated through space by a 10-N force. Suddenly the
particle encounters a second force of 10 N in the opposite direction. The particle with
both forces acting
A) is brought to a rapid halt.
B) decelerates gradually to a halt.
C) continues at the speed it had when it encountered the second force.
D) theoretically tends to accelerate toward the speed of light.
E) none of the above
A pair of hydrogen nuclei fused together produces
A) helium.
B) lithium.
C) beryllium.
D) carbon.
E) iron.
When you turn on a lamp, the initial current in its filament is greater at first, rather than
a moment later, which indicates
A) something is faulty.
B) a time delay for current attaining its average speed.
C) increased temperature means increased resistance.
D) nothing of interest
A torque acting on an object tends to produce
A) equilibrium.
B) rotation.
C) linear motion.
D) velocity.
E) a center of gravity.
Which contains more atoms?
A) 1 kg of hydrogen
B) 1 kg of iron
C) both contain the same
A 10-N falling object encounters 10 N of air resistance. The net force on the object is
A) 0 N.
B) 4 N.
C) 6 N.
D) 10 N.
E) none of these
If you view a rainbow out your window while riding in a train, you’ll see that
A) the rainbow can only be seen while you’re moving slowly or at rest.
B) the rainbow moves along with you.
C) you soon pass by it, leaving it where you first saw it.
Suspend your body from a pair of ropes slightly angled from the vertical and the tension
in each rope will be
A) equal your weight.
B) half your weight.
C) greater than half your weight.
D) none of these
Compared to clocks in a stationary reference frame, clocks in a moving reference frame
run
A) slower.
B) faster.
C) at the same rate.
A person is attracted toward the center of Earth by a gravitational force of 500 N. The
force with which Earth is attracted toward the person is
1) 500 N
2) infinitesimally small
3) billions and billions of tons
principally because
4) the forces in question make an action/reaction pair.
5) the mass of the person is negligible compared to the mass of Earth.
6) Earth itself weighs billions and billions of tons.
7) of inertia.
An adiabatic process is characterized by the absence of
A) entropy.
B) pressure change.
C) heat exchange.
D) temperature change.
E) none of the above
Which potato cooks faster in boiling oil?
A) a whole potato.
B) a sliced potato.
C) both the same
When you drop a rubber ball on the floor it bounces back. The force exerted on the ball
to produce bouncing is by the
A) ball.
B) floor.
C) need more information
When you blow over hot soup to cool it you are helping
A) to slightly increase air pressure atop the soup surface.
B) more energetic particles in the soup to escape.
C) conduction, convection, and radiation.
D) none of the above
The speed of light is
A) relative to the frame of reference from which it is measured.
B) a speed approached but never quite reached by photons.
C) constant for all observers.
The natural frequency of the atoms in glass is in the
A) infrared part of the spectrum.
B) visible part of the spectrum.
C) ultraviolet part of the spectrum.
The compressions and rarefactions in a longitudinal wave travel in
A) the same direction.
B) opposite directions.
C) a vacuum.
A razor blade nicely shows diffraction fringes when illuminated with
A) ultraviolet light.
B) monochromatic light.
C) sunlight.
D) all of the above
E) none of the above
A new theory conforms to the correspondence principle when it
A) corresponds to all theories in nature.
B) updates the essence of the old theory.
C) connects two or more theories.
D) accounts for verified results of the old theory.
A profound message from all of science is that we are a part of nature
A) that stands above other life forms.
B) and have the ability to conquer it.
C) that is becoming more and more conscious of itself.