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Fermat's principle could be the principle of least distance for
A) reflection.
B) refraction.
C) both of these
D) neither of these
While you stand on the floor you are pulled downward by gravity, and supported
upward by the floor. Gravity pulling down and the support force pushing up
A) make an action-reaction pair of forces.
B) do not make an action-reaction pair of forces.
C) need more information
A capacitor is useful in
A) boosting the energy output of a circuit.
B) increasing the current in a resistor.
C) smoothing pulsed current.
D) changing dc to ac in a circuit.
E) increasing or decreasing voltage.
You shine a beam of monochromatic light from Earth to an astronaut friend in orbit.
The light your friend receives, relative to light from an equivalent source on the
spaceship, is slightly
A) slower in speed.
B) higher in speed.
C) neither of these
A piece of taffy slams into and sticks to an identical piece of taffy at rest. The
momentum of the combined pieces after the collision is the same as before the collision,
but this is not true of the kinetic energy, which partly degrades into heat. What
percentage of the kinetic energy becomes heat?
A) 0%
B) 25%
C) 50%
D) 75%
E) need more information
Light is reflected when
A) electron clouds of atoms are energized.
B) atomic nuclei are made to vibrate.
C) incident light is returned into the medium from which it came.
D) electromagnetic waves emanate from matter.
During snow fall, the surrounding air is
A) cooled.
B) warmed.
C) both of these
D) neither of these
Huygens' principle applies mainly to
A) refraction of waves in a medium.
B) reflection of waves.
C) both of these
D) neither of these
The equivalent (combined) resistance of 1-ohm, 2-ohm, and 3-ohm in series is about
A) 1 ohm
B) 1.8 ohms.
C) 6 ohms.
D) 9 ohms.
A spaceship whizzes past a planet at high speed. An observer on the planet sees a
contracted spaceship, while an observer on the spaceship sees
A) a contracted planet.
B) an expanded planet.
C) a normal planet.
D) a contracted or expanded planet depending on the direction of travel.
The pendulum with the greatest frequency is one with the
A) shortest length.
B) longest length.
C) neither of these
Direct current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these
The metal detectors that people walk through at airports operate via
A) Ohm's law.
B) Faraday's law.
C) Coulomb's law.
D) Newton's laws.
E) civil laws.
Into which stable force field can a proton be placed at rest without being acted upon by
a force?
A) magnetic field
B) electric field
C) both of these
D) neither of these
The Ritz combination principle states that the sum of the
A) frequencies of two lines in a spectrum often equal the frequency of a third line.
B) energies associated with two lines in a spectrum often equal the energy associated
with a third line.
C) energy transitions of quantum jumps is consistent with the conservation of energy.
D) all of the above
E) none of the above
A car by itself is capable of a certain maximum acceleration. When it tows a
twice-as-massive car, its maximum acceleration is
A) one half.
B) one third.
C) one fourth.
D) the same.
E) none of these
When U-238 emits an alpha particle, the resulting nucleus has
A) 90 protons.
B) 91 protons.
C) 92 protons.
D) 93 protons.
E) 94 protons.
The principle difference between a step-up and step-down transformer is
A) step-up transformers can handle more current.
B) different geometries.
C) different ratios of turns of wire for each.
D) none of the above
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
Reactions that take place in a breeder reactor change
A) elements into different elements.
B) molecules into different molecules.
C) ions into different ions.
D) all of the above
E) none of the above
What color is fully transmitted in common window glass?
A) red
B) yellow
C) green
D) blue
E) all of the above
Hypothetically, if Planck's constant were smaller, atoms would be
A) larger.
B) smaller.
C) no different in physical size.
If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is
about
A) 60 m.
B) 120 m.
C) 180 m.
D) more than 200 m.
The stride of a horse would be quicker if more mass in its legs were concentrated
A) in the upper part, nearer the horse's body.
B) towards its feet.
C) halfway up its legs.
D) uniformly all along its legs.
E) none of the above
Refrigerator magnets are typically
A) short range.
B) long range.
C) none of these
The rate at which energy is transferred is
A) power.
B) electromagnetic induction.
C) transformation.
D) none of the above
The image in a pinhole camera is
A) always inverted.
B) sometimes inverted.
C) always right-side up.
The pitch of a guitar relates to the string's
A) length.
B) tension.
C) mass.
D) all the above
E) none of the above
An ampere is a unit of electric
A) current.
B) voltage.
C) resistance.
To become a negative ion, an atom must
A) lose an electron.
B) gain an electron.
C) lose a proton.
D) gain a proton.
A Doppler effect occurs when a source of sound moves
A) towards you.
B) away from you.
C) either of these
D) neither of these
