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When you're ready for the hottest sips of coffee, add cream
A) right away.
B) at any time.
C) when you are ready to drink the coffee.
What characteristic of light mostly relates to color?
A) frequency
B) amplitude
C) both of these
When a rocket forces exhaust gases downward, the exhaust gases
A) as the name implies, soon exhaust their influence.
B) play no further role in the motion of the rocket.
C) exert an upward force on the rocket.
Two people are balanced on a seesaw. If one person leans inward toward the center of
the seesaw, that person's end of the seesaw tends to
A) rise.
B) fall.
C) stay at the same level.
D) need more information
From Earth, one satellite appears to overtake another. The faster satellite is
A) higher.
B) lower.
C) smaller.
D) can't say
On a muggy day, water molecules in the air that strike our bodies
A) transfer some of their kinetic energy to us.
B) gain kinetic energy as they change phase.
C) form an insulating layer on our bodies.
If you cover half a camera lens with opaque tape, the images produced will be
A) cut in half.
B) only dimmer.
C) both of these
D) neither of these
A heat engine would have 100% efficiency if its low-temperature reservoir were
A) as hot as its reservoir.
B) at absolute zero.
C) either of these
D) neither of these
Deuterium and tritium are both
A) forms of hydrogen.
B) isotopes of the same element.
C) both of these
D) neither of these
For increased atmospheric pressure, the boiling point of water
A) goes down.
B) rises.
C) remains at 100 degrees C.
How many protons should be added to the nuclei of oxygen atoms so the resulting gas
will glow red when an electric current is in it?
A) 1
B) 2
C) 3
D) 4
E) none of the above
A paint pigment that absorbs red light and gives off blue light
A) is fluorescent.
B) is phosphorescent.
C) is used in lasers.
D) is polarized.
E) doesn't exist.
The effects of scaling are beneficial to small creatures
A) that get wet.
B) that fall from great heights.
C) who are hungry.
D) all of the above
E) none of the above
A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W
of power go into the primary coil, the power coming from the secondary coil is
A) 1 W.
B) 10 W.
C) 100 W.
D) 1000 W.
E) none of the above
If a nitrogen atom and a slightly heavier oxygen atom have equal kinetic energies,
which has the greater average speed?
A) nitrogen
B) oxygen
C) both the same
D) need more information
The resulting atomic number of an element that emits 1 alpha particle, 1 positron, and 3
beta particles is
A) decreased by 2.
B) decreased by 1.
C) unchanged.
D) increased by 1.
E) increased by 2.
Which would require the greater energy; slowing the orbital speed of a satellite so it
crashes into Earth, or increasing the orbital speed so it escapes Earth?
A) slowing down
B) speeding up
C) same each way
Which wavelengths are shortest?
A) light ray
B) X-ray
C) gamma ray
Which of the following is quantized?
A) energy
B) radiation
C) number of atoms in a gold bar
D) electric charge
E) all of the above
In a spaceship with an acceleration more than g far from gravitational influences, with
the effort it takes on Earth to do 20 pushups, you could comfortably do
A) less than 20 pushups.
B) 20 pushups.
C) more than 20 pushups.
Argon rather than air is the gas used in incandescent bulbs because
A) it produces a pleasing bluish glow.
B) oxygen in air oxidizes the lamp filament.
C) argon is relatively plentiful.
D) none of the above
A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force.
What is the tension in the rope?
A) zero
B) 400 N
C) 600 N
D) 800 N
E) none of the above
A beam of electrons can be deflected by a
A) magnetic field.
B) electric field.
C) both of these
D) neither of these
A good absorber of radiation is a
A) good emitter of radiation.
B) poor emitter of radiation.
C) good reflector.
D) none of the above
Credit for research in our knowledge of atomic spectra includes
A) Johann Jacob Balmer.
B) Johannes Rydberg.
C) Walter Ritz.
D) all of the above
E) none of the above
Although perpetual motion is the natural order of things in the universe
A) it follows that machines can operate and do work by perpetual motion.
B) no perpetual-motion device that multiplies energy exists.
C) both of these are false statements
Stand a broom upright on the end of its pole and let it topple to the floor. Repeat, but
with the bristles end on the floor. The faster fall will be the broom standing on its
A) pole-end.
B) bristles-end.
C) the same either way
A problem with the Bohr model of the atom is that electrons circling the nucleus
A) accelerate and should continuously emit radiation.
B) lose energy and should spiral into the nucleus.
C) both of these
D) neither of these
Faraday's law was extended by Maxwell toward
A) changes in electric fields.
B) changes in magnetic fields.
C) both of these
D) neither of these
Which has the greater density?
A) a cup-full of fresh water
B) a lake-full of fresh water
C) both the same
D) need more information
As we grow older, the greatest hearing difficulty is with frequencies that are
A) low.
B) mid-range.
C) high.
The term critical mass refers to the least amount of mass that can
A) sustain a chain reaction.
B) squelch a chain reaction.
C) explode when rapidly brought against a neighboring piece.
D) none of the above
Tidal bulges on the Moon involve the concept of
A) torques.
B) elasticity.
C) slight water on the Moon.
D) magnetism.
Which of these lamps employs semi-conductor technology?
A) incandescent lamp
B) fluorescent lamp
C) CFL
D) LED
If a poor absorber of radiation were a good emitter, its temperature would be
A) less than its surroundings.
B) more than its surroundings.
C) the same as its surroundings.
