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For an isotope with a half-life of one day, at the end of three days the amount that
remains is
A) none.
B) one-half.
C) one-quarter.
D) one-eighth.
E) none of the above
If the volume of an object were doubled while its mass remained the same, its density
would
A) be half.
B) double.
C) stay the same.
D) be four times as great.
A pair of air pucks on an air table are set in motion when a compressed spring between
them is released. If one puck moves with twice the speed of the other, then its mass is
A) half the mass of the other.
B) the same mass as the other.
C) twice the mass as the other.
D) need more information
A projectile is launched vertically upward at 50 m/s. If air resistance does affect motion,
then its speed upon returning to its starting point is
A) less than 50 m/s.
B) 50 m/s.
C) more than 50 m/s.
Electrons flow in an electrical circuit by
A) being bumped by other electrons.
B) colliding with molecules.
C) interacting with an established electric field.
D) none of the above
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
A) 30 hertz and it travels at 60 m/s.
B) 60 hertz and it travels at 30 m/s.
C) 1800 hertz and it travels at 2 m/s.
D) none of the above
Ohm's law tells us that the amount of current produced in a circuit is
A) directly proportional to voltage.
B) inversely proportional to resistance.
C) both of these
D) neither of these
A ball rolls off the edge of a table at the same time another ball drops vertically from
the same table. The ball to hit the floor first is the
A) rolling ball.
B) dropped ball.
C) both hit at the same time
The kind of waves that travel fastest through a long metal rod have
A) short wavelengths.
B) waves of medium length.
C) long wavelengths.
D) all have the same speed
Accelerate an electron and you produce an electromagnetic wave. Accelerate a massive
body and you produce
A) a gravitational wave.
B) a cosmic wave.
C) both of these
D) neither of these
If a non-rotating object has no acceleration, then we can say for certain that it is
A) at rest.
B) moving at constant non-zero velocity.
C) in mechanical equilibrium.
D) all of the above
E) none of the above
The frequencies of sound that carry farther in air are
A) low.
B) high.
C) ultrasonic.
D) none of the above
When two pieces of fissionable material are assembled, the average distance that a
neutron travels before escaping will
A) decrease.
B) increase.
C) be the same.
The total momentum of a flock of identical birds could be zero only if the birds are
A) taking off from the ground.
B) flying in the same direction.
C) flying in different directions.
D) very tired and coming down to rest.
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.
A dam is thicker at the bottom than at the top mainly because
A) water is denser at deeper levels.
B) water pressure increases with depth.
C) surface tension exists only on the surface of liquids.
D) it looks better.
E) none of the above
A proton and an electron are placed in an electric field. Which undergoes the greater
acceleration?
A) electron
B) proton
C) both accelerate equally.
D) none of the above
When you walk, you push on the floor to the left and the floor
A) also pushes on you to the left.
B) pushes you to the right.
C) both of these simultaneously.
D) can only wish it could push on you.
E) none of the above
An archer shoots an arrow. Consider the action force to be the bowstring against the
arrow. The reaction to this force is the
A) combined weight of the arrow and bowstring.
B) friction of the ground against the archer's feet.
C) grip of the archer's hand on the bow.
D) arrow's push against the bowstring.
Cosmic rays penetrate your body when
A) safely in your home.
B) outdoors.
C) in mountainous regions.
D) all of the above
E) none of the above
On some early automobiles both headlights failed when one bulb burned out. The
headlights were likely connected in
A) parallel.
B) perpendicular.
C) series.
D) haste.
Foreign ions introduced to water
A) lower the freezing point of water.
B) raise the freezing point of water.
C) do not affect water's freezing point.
A throbbing pulse of electromagnetic radiation is called a
A) proton.
B) photon.
C) phototron.
D) newtron.
E) nooytron.
A node is a position of
A) minimum amplitude.
B) maximum amplitude.
C) half amplitude.
If a proton and an electron have the same momentum, the longer wavelength belongs to
the
A) proton.
B) electron.
C) both the same
To turn 1 gram of boiling water to steam requires
A) almost as much energy as changing 1 gram of 0oC water to the boiling point.
B) as much as increasing 1 kilogram of 95oC water to the boiling point.
C) more energy than needed to turn 1 gram of absolute-zero ice to the boiling point.
D) none of the above
If you bake cupcakes as directed for a cake, the cupcakes will be
A) over-baked.
B) under-baked.
C) properly baked.
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.
A molecule has
A) mass.
B) structure.
C) energy.
D) all of the above
E) none of the above
About what percentage of molecules in the air make up the atmosphere below a
6-kilometer altitude?
A) 20%
B) 30%
C) 40%
D) 50%
E) more than 50%
The device that spreads light into its component colors in a spectroscope is a
A) prism.
B) diffraction grating.
C) either of these
D) neither of these
A bag of groceries that has a mass of 10 kilograms weighs about
A) 1 N.
B) 10 N.
C) 100 N.
D) 1000 N.
E) greater than 1000 N.
