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Ice crystals in nearly frozen liquid water make up a
A) microscopic slush.
B) region of lower density.
C) both of these
D) neither of these
The air that you breathe doesn't emit visible light indicates that most of the electrons of
its atoms are
A) in the ground state.
B) excited to metastable states.
C) relatively cool.
D) electrically neutral.
E) relatively far apart.
An ampere is a unit of electric
A) current.
B) voltage.
C) resistance.
The depth to which an inverted drinking glass must be pushed beneath the water surface
to squeeze the enclosed air to half its volume is
A) 76 cm.
B) 10.3 m.
C) 14.7 m.
D) 20.6 m.
E) 29.4 m.
In placing a cool thermometer into a hot cup of tea you likely are
A) affecting its temperature.
B) draining energy from the tea.
C) both of these
D) neither of these
A scuba diver losing her air supply while far beneath the water surface is advised when
ascending to
A) hold air in her lungs.
B) allow air to escape her lungs.
C) panic.
A superconducting magnet uses
A) iron cores.
B) superconducting coils.
C) both of these
D) neither of these
Place an iron rod inside a current-carrying coil of wire and you
A) increase the strength of the electromagnet.
B) have a superconducting magnet.
C) a magplane in the making.
A skydiver steps from a helicopter and falls for a few seconds until terminal velocity is
reached. Thereafter, until he opens his parachute, his acceleration
A) is constant.
B) increases.
C) decreases.
D) is zero.
E) none of the above
If several balls are thrown straight up with different initial speeds, the quantity that will
have the same value along their paths is their
A) initial momentum.
B) maximum height.
C) time of travel.
D) acceleration.
E) none of the above
A fish normally displaces its own
A) volume of water.
B) weight of water.
C) both of these
D) neither of these
If you stand on a weighing scale and suddenly the atmosphere vanishes, taking
buoyancy into account, the scale reading
A) increases.
B) decreases.
C) remains the same.
D) quickly reduces to zero.
The kinetic energy of fission fragments in a nuclear reactor
A) superheats water and produces steam.
B) converts to gamma-ray radiation.
C) becomes radioactive pollution.
D) converts directly to electricity.
E) none of the above
Sunburns are produced by
A) infrared light.
B) visible light.
C) ultraviolet light.
D) all of the above
E) none of the above
When you do somersaults, you'll more easily rotate when your body is
A) straight with both arms above your head.
B) straight with both arms at your sides.
C) curled into a ball shape.
D) no difference
Pure elements can be transformed into entirely different elements by
A) radioactive decay.
B) transmutation.
C) both of these
D) neither of these
When a pulse of white light is incident on a glass prism, the first color to emerge is
A) red.
B) orange.
C) green.
D) violet.
The source of electrons that illuminate a common lamp in your home is
A) the power company.
B) the electrical outlet.
C) atoms in the lamp filament.
D) the wires leading to the lamp.
E) the source voltage.
Which body glows with electromagnetic waves?
A) the Sun
B) the Earth
C) you and your classmates
D) all of the above
When a load is placed on the middle of a horizontal beam supported at each end, the
bottom part of the beam undergoes
A) tension.
B) compression.
C) either of these
D) none of these
Heat energy travels from an object with a high
A) internal energy to an object with a lower internal energy.
B) temperature to an object with a lower temperature.
C) both of the above
D) none of the above
A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp
is
A) less.
B) greater.
C) the same.
Compared to a single lamp connected to a battery, two identical lamps connected in
series to the same battery will carry
A) more current.
B) less current.
C) the same current.
Astronomers can detect the spin rates of stars by
A) their temperature.
B) changes in temperature.
C) absorption spectra.
D) the Doppler effect.
E) all of the above
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.
A good cook knows that the temperature of violently boiling water is
A) higher than that of simmering water.
B) the same as that of simmering water.
C) actually lower than 100oC.
D) neither of the above
Metals are good conductors of both heat and electricity due to
A) similar thermal and electrical conductive properties.
B) looseness of outer electrons in metal atoms.
C) relatively high densities of metals.
D) high elasticity of metals.
E) both transferring energy easily.
A stable electron orbit cannot exist if its circumference is
A) a single wavelength.
B) 2 wavelengths.
C) 2.5 wavelengths.
D) any of the above
E) none of the above
An excited atom is an atom
A) with excess vibration.
B) with one or more displaced electrons.
C) with more protons than electrons.
D) that is frantic.
Newton hypothesized that the forces acting on planets was
A) along their directions of travel.
B) perpendicular to their directions of travel.
C) toward the Sun.
D) none of the above
When the distance between two charges is halved, the electrical force between them
A) is reduced by 1/4.
B) halves.
C) doubles.
D) quadruples.
E) none of the above
Firefighters find that the temperature of burning material is best lowered when water is
A) used in small amounts.
B) pointed away from the flames.
C) sprayed as a fine mist.
D) salted.
The force of Earth's gravity on a capsule in space increases as it comes closer. When the
capsule moves to half its distance, the force toward Earth is then
A) twice.
B) three times greater.
C) four times greater.
D) none of the above
A hockey puck sliding across the ice finally comes to rest because
A) it seeks its proper and natural state.
B) of friction.
C) that's just the way it is.
When you stand at rest with your left foot on one bathroom scale and your right foot on
a similar scale, each of the scales will
A) read half your weight.
B) read your weight.
C) show readings that when added equal your weight.
D) cancel your weight.
