The voltage across a 10-ohm resistor carrying 5 A is
A) 5 V.
B) 10 V.
C) 15 V.
D) 20 V.
E) more than 20 V.
What color light is transmitted by a piece of blue glass?
A) red
B) white
C) blue
D) yellow
E) orange
You can safely stand on the overhanging end of a heavy plank that rests on a table. How
much overhang depends on your mass and the mass of the plank. If you can stand on
the end of a plank that overhangs the edge of the supporting table 1/5 its total length,
how massive is the plank compared to your mass?
A) 1/3
B) the same
C) 2/3
D) 1 and 1/3 times
E) more than 1 and 1/3 times
If a critical mass of fissionable material in a spherical shape is flattened like a
hamburger, it will be
A) supercritical.
B) subcritical.
C) as critical.
Every isolated proton in the universe is surrounded by its own
A) electric field.
B) gravitational field.
C) both of these
D) neither of these
The force required to maintain a constant velocity for an astronaut in free space is equal
to
A) zero.
B) the mass of the astronaut.
C) the weight of the astronaut.
D) the force required to stop the astronaut.
E) none of the above
The amount of energy converted to light by an incandescent light bulb is about
A) 10% and the amount converted to heat about 90%
B) 90% and the amount converted to heat about 10%.
C) either of these depending on the brand.
When a boxer is moving away from a punch, the force experienced is reduced because
A) momentum transfer is reduced.
B) the time of contact is increased.
C) the force is less effective.
D) all 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.
While an iron block near the Earth’s surface is in free fall, it undergoes an increase in
A) speed.
B) acceleration.
C) both of these
D) neither of these
The electric power supplied to a lamp that carries 2 A at 120 V is
A) 1/6 watts.
B) 2 watts.
C) 60 watts.
D) 20 watts.
E) 240 watts.
Repeatedly tap the side of a drinking glass with a spoon as you fill the glass with water
and the pitch of the sound
A) increases.
B) decreases.
C) remains relatively constant.
Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball
straight down, both with the same speed. Neglecting air resistance, which ball hits the
ground below with the greater speed?
A) the one thrown upward
B) the one thrown downward
C) neither, both hit with the same speed
Dr. Chuck projects a ball horizontally from a lab bench. The ball lands on a bullseye
marked on the floor a horizontal distance away. Compared to the time for the ball to
simply drop vertically from the bench, the time in the air for Dr. Chuck’s projected ball
is
A) less.
B) the same.
C) greater.
The number of nodes, including the end points, in a standing wave that is two
wavelengths long is
A) 1.
B) 2.
C) 3.
D) 4.
E) none of the above
Taking the work function into account, electrons ejected from a photosensitive material
have
A) less kinetic energy than the absorbed photon’s energy.
B) more kinetic energy than the absorbed photon’s energy.
C) kinetic energy equal to the absorbed photon’s energy.
If a block is set sliding on a huge imaginary frictionless plane in contact with Earth’s
surface, it will NOT sustain a constant speed because
A) a component of gravitational force parallel to the plane soon acts on it.
B) gravity gets weaker as distance increases.
C) it is not free from the shackles of Earth’s gravity.
D) of its inertia.
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
A projectile is fired into the air at an angle of 50 above ground level and hits a target
downrange. It will also hit the target if fired at an angle of
A) 40.
B) 45.
C) 55.
D) 60.
E) none of the above
In a circuit powered by a battery, charge
A) flows through the battery.
B) is energized by the battery.
C) both of these
D) neither of these
A radio wave and a visible light wave differ only in
A) frequency.
B) energy per photon.
C) both of these
D) none of these
The net force acting on an insect falling downward at constant velocity is
A) zero.
B) the weight of the insect.
C) upward air resistance.
D) none of the above
A Geiger counter placed 1 meter from a point source of radiation registers 100 counts
per minute. If the Geiger counter is moved closer, half-way to the source, the counting
rate will be
A) 25 counts/min.
B) 50 counts/min.
C) 100 counts/min.
D) 200 counts/min.
E) 400 counts/min.
A toy elevator is raised from the ground floor to the second floor in 20 seconds. The
power needed using 1000 J of work, is
A) 20 W.
B) 50 W.
C) 100 W.
D) 1000 W.
E) 20,000 W.
The pressure at the bottom of a geyser is
A) less than nearer the top.
B) the same as nearer the top
C) greater than nearer the top.
D) all of the above
E) none of the above
Holograms employ the principle of
A) diffraction.
B) interference.
C) both of these
D) neither of these
Which is more dangerous, touching a faulty 110-volt light fixture, or a Van de Graaff
generator charged to 100,000 volts?
A) touching the light fixture
B) touching the generator
C) touching both are about equally dangerous.
Compared to the density of a kilogram of feathers, the density of a kilogram of lead is
A) less.
B) more.
C) the same.
A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water
is pointed due east as it crosses from the west bank. Relative to its starting point, the
boat travels
A) nowhere.
B) 100 m.
C) 141 m.
D) 200 m.
E) more than 200 m.
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. The 360-N force
on the spacecraft is directed
A) toward the asteroid.
B) away from the asteroid.
C) toward the Sun.
The change in internal energy of adding 100 joules to a system that does 60 joules of
work is
A) 0 J.
B) 40 J.
C) 60 J.
D) 100 J.
E) none of the above
Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard. The
reason he doesn’t slip off the skateboard is due to
A) inertia in motion.
B) momentum change.
C) friction between his feet and the board.