Sara lies on a bed of sharp nails without harm because
A) many of the nails don’t make contact with her body.
B) her weight is distributed over hundreds of nails.
C) she exercises mind over matter.
D) none of the above
The greenish blue of water is evidence for the
A) reflection of greenish-blue light.
B) reflection of red light.
C) absorption of greenish-blue light.
D) absorption of red light.
E) interaction between green and blue frequencies of light.
The force that binds atoms together to form molecules is
A) gravitational.
B) nuclear.
C) electrical.
D) centripetal.
E) none of the above
A superconducting magnet uses
A) iron cores.
B) superconducting coils.
C) both of these
D) neither of these
In units of measurement, power in watts is equal to
A) amperes x ohms.
B) amperes x volts.
C) amperes/second.
D) volts/second.
E) none of the above
Substances absorb heat energy by the process of
A) conduction.
B) convection.
C) radiation.
D) all of the above
If we doubled the magnifying power of the most powerful optical microscope in the
world, we would
A) be able to see individual atoms.
B) be able to photograph individual atoms, even though we couldn’t see them.
C) still not be able to see or photograph an atom.
A radiation detector measures radioactivity decay of a piece of radium by catching and
counting alpha particles it emits. Making this measurement affects the
A) radiation rate of the piece of radium.
B) alpha particles that are caught and counted.
C) both of these
D) neither of these
When sound travels faster higher above the ground than below, bending of sound tends
to be
A) upward.
B) downward.
C) to the left.
D) to the right.
E) none of the above
Millikan was able to stop falling oil droplets in their paths by
A) opposing electric and gravitational forces.
B) magnetic repulsion.
C) both of these
D) neither of these
A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction
force between the tree and the bear is
A) 30 N.
B) 300 N.
C) 3000 N.
D) more than 3000 N.
Radiation dosage is commonly measured in
A) rads.
B) rems.
C) joules.
D) none of the above
An element will decay to an element with higher atomic number in the periodic table if
it emits
A) a beta particle.
B) a gamma ray.
C) a proton.
D) an alpha particle.
E) none of the above
A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is
the mass of the car?
A) 500 kg
B) 1000 kg
C) 1500 kg
D) 3000 kg
E) none of these
To drop a package to Earth from a satellite, project it
A) straight downward.
B) ahead at satellite speed.
C) behind at satellite speed.
D) none of the above
A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the
same kind of metal with a volume of 2 cubic centimeters has a density of
A) 2.5 g/cm3.
B) 5 g/cm3.
C) 10 g/cm3.
Heat energy is measured in units of
A) joules.
B) calories.
C) both of these
D) neither of these
An observer moving with a light clock in a spaceship sees a light flash bouncing up and
down between parallel mirrors in 1 nanosecond. An observer at rest outside the
spaceship sees the same up-and-down flash in
A) 1 nanosecond also.
B) less than 1 nanosecond.
C) more than 1 nanosecond.
An equal amount of 0oC air that is twice as hot has a temperature of
A) 0oC.
B) 64oC.
C) 100oC.
D) 273oC.
E) none of the above
Which has the greater momentum when moving?
A) a container ship
B) a bullet
C) either of these depending on speed
Sound will be louder if a struck tuning fork is held
A) in the air.
B) with its base against a tabletop.
C) with its prongs in shallow water.
D) in your closed fist.
Various singly-ionized atomic nuclei of the same speed are directed into a magnetic
field in a mass spectrometer where they are deflected and strike a detecting screen. The
particles most strongly deflected are those of
A) least mass.
B) greatest mass.
C) same for all
A satellite in an elliptical orbit about a planet travels much faster when it is directly
over a
A) large ocean.
B) large island.
C) high mountain range.
D) great plain or plateau.
E) none of the above
The nucleus having the most tightly bound nucleons is
A) hydrogen.
B) iron.
C) lead.
D) uranium.
E) plutonium.
Figure N-9
While a ship moves toward the right at constant velocity, a seaman atop the mast drops
a stone which freely falls to position
1) A.
2) B.
3) C.
This is better understood by realizing that
4) the ship moved to the right a distance equal to that between A and B while the stone
fell vertically.
5) the stone was moving to the right just as fast as the ship during the fall.
6) the net force acting on the stone is equal to its weight.
7) because of inertia, the stone experiences a horizontal motion unlike that of the ship.
8) the stone underwent an acceleration while the ship did not.
Thomas Young’s two-source interference patterns demonstrate the
A) particle nature of light.
B) wave nature of light.
C) both of these
D) neither of these
An electric motor is very similar to
A) an electric generator.
B) an automobile battery.
C) a radio receiver.
D) none of the above
A ball is thrown vertically into the air. Because of air resistance, its time coming down
compared to its time going up is
A) less.
B) the same.
C) more.
For electric current in the home, your power company supplies
A) energy.
B) electrons.
C) both of these
D) neither of these
Compared with the sum of isolated-nucleon masses, their collective mass in a
composite nucleus is
A) more.
B) less.
C) the same.
Generally speaking, the larger a nucleus is, the greater its
A) stability.
B) instability.
C) neither stability nor instability
Which device is used primarily to detect nuclear radiation?
A) synchrotron
B) linear accelerator
C) cyclotron
D) scintillation counter
E) none of the above