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A decibel is a measure of a sound's
A) frequency.
B) wavelength.
C) speed.
D) loudness.
E) all of the above
The most abundant element in the universe is
A) hydrogen.
B) helium.
C) lead.
D) uranium.
If the voltage produced by a generator alternates, it does so because
A) unlike a battery, it produces alternating current.
B) the changing magnetic field that produces it alternates.
C) of alterations in the mechanical energy input.
D) all of the above
E) none of the above
An acoustical engineer in designing a music hall is concerned with
A) echoes.
B) reflection.
C) reverberations.
D) all of the above
E) none of the above
About how high can water at sea level be theoretically lifted by a vacuum pump?
A) less than 10.3 m
B) 10.3 m
C) more than 10.3 m
Electrons can be transferred from one place to another by the process of
A) friction.
B) contact, which means touching.
C) induction, which means non-touching.
D) all of the above
E) none of the above
A dropped ball gains speed because
A) its velocity changes.
B) a gravitational force acts on it.
C) of inertia.
D) its nature is to become closer to Earth.
Credit for research in our knowledge of the electron includes
A) William Crookes.
B) J.J. Thomson.
C) Robert Millikan.
D) all of the above
E) none of the above
A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil
velocity of the rifle is about
A) 0.001 m/s.
B) 0.01 m/s.
C) 0.1 m/s.
D) 1 m/s.
E) none of these
When the nucleus of an atom emits a beta particle, the atom's atomic number
A) decreases.
B) remains unchanged.
C) increases.
An element is distinct because of its number of
A) protons.
B) neutrons.
C) electrons.
D) the total mass of all the particles.
E) none of the above
Nellie's weight and normal force usually have the same magnitude when she stands on a
A) horizontal surface.
B) inclined surface.
C) either a horizontal or inclined surface.
To send a beam laser-light beam to a space station just above the atmosphere near the
horizon, aim your laser
A) above your line of sight.
B) below your line of sight.
C) along your line of sight.
Although a magnet can change the direction of travel of an electron beam, it cannot
change its
A) speed
B) kinetic energy.
C) both of these
D) neither of these
If a light signal and a radio signal were emitted simultaneously from Alpha Centauri,
the first to reach Earth would be the
A) radio signal.
B) light signal.
C) both the same time
A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side-by-side
are used to suspend the 1-kg block, each spring will then stretch
A) 5 cm.
B) 10 cm.
C) 20 cm.
D) 30 cm.
E) none of the above
To become a negative ion, an atom must
A) lose an electron.
B) gain an electron.
C) lose a proton.
D) gain a proton.
The physics underlying the redness of sunsets and the color of blue jays involves
A) scattered sunlight.
B) absorbed sunlight.
C) different processes for sunsets and blue jays.
Einstein rejected the classical idea that space and time are
A) two parts of a whole.
B) connected to each other.
C) independent of each other.
The principle of equivalence tells us that
A) mass and energy are forms of each other.
B) space and time are forms of each other.
C) electricity and magnetism are forms of each other.
D) observations made in an accelerating reference frame are indistinguishable from
those made in a gravitational field.
E) all of the above
A beam is under stress when it carries a load. The part of a beam where no tension or
compression occurs is the
A) upper or lower flange.
B) neutral layer.
C) neither of these
According to Newton, the greater the masses of interacting objects, the
A) less the gravitational force between them.
B) greater the gravitational force between them.
C) greater the force between them by the square of the masses.
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 1-kg ball dropped from 2 m rebounds only 1.5 m after hitting the ground. The amount
of energy converted to heat is about
A) 0.5 J.
B) 1.0 J.
C) 1.5 J.
D) 2.0 J.
E) more than 2.0 J.
When railroad tracks make a curve, the outer track is longer. This means a wheel that
rides on the outer track needs to somehow
A) roll slower than the wheel on the inner track.
B) maintain the same speed as the wheel on the inner track.
C) roll faster than the wheel on the inner track.
Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite
direction. Jake's speed relative to the ground is
A) 6 m/s.
B) 10 m/s.
C) 14 m/s.
D) none of the above
If Alex wishes to rotate his skateboard, then he must apply a
A) torque.
B) rotational maneuver.
C) pause before bearing down on the board.
To increase the temperature of 50 grams of water by 2 Celsius degrees requires
A) 0.04 calorie.
B) 2 calories.
C) 4.19 calories.
D) 25 calories.
E) 100 calories.
If the net force on a cart is tripled, the cart's acceleration
A) is one third.
B) is two thirds.
C) is three times as much.
D) is more than three times as much.
Which of the following is a scientific statement?
A) candy Bon Bons contain no sugar
B) there are things we will never know about
C) matter is filled with undetectable particles
D) there are parts of the universe that will never be discovered by humans
E) none of the above
A common 5-liter metal can will float in air if it is
A) evacuated of air.
B) filled with a very large amount of helium.
C) thrown high enough.
D) no way, unless the displaced air weighs more than the can and its contents!
