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The event horizon of a black hole is
A) the surface below which no matter or energy can escape.
B) the surface where light becomes trapped in a circular orbit around the black hole.
C) the physical surface of the black hole.
D) the point in time when a black hole comes into being.
Answer:
The most violent volcanic explosions are generally associated with
A) composite volcanoes.
B) cinder cones.
C) shield volcanoes.
D) none of these
Answer:
If the concentration of gold in seawater is 2.0 milligram per ton of sea water and the
mass of the ocean is 1.5 1018 tons, how much gold is in the ocean?
A) 3.0 1012 kg
B) 3.0 kg
C) 300 g
D) 36 mg
E) 3000 lb
Answer:
Which have the longest wavelengths when traveling in a vacuum?
A) radio waves
B) light
C) X-rays
D) all the same
Answer:
Two light bulbs, a thick-filament one and a thin-filament one, are connected in parallel
to a battery. The voltage is greater across the lamp with the
A) thick filament.
B) thin filament.
C) same for each
Answer:
Strictly speaking, it is correct to say that
A) charge flows through a circuit.
B) voltage flows through a circuit.
C) resistance is established across a circuit.
D) current causes voltage.
E) all of these
Answer:
The impulse-momentum relationship is a direct result of
A) Newton's first law.
B) Newton's second law.
C) Newton's third law.
Answer:
The average speed of a horse that gallops a distance of 10 km in a time of 30 min is
A) 10 km/h.
B) 20 km/h.
C) 30 km/h.
D) more than 30 km/h.
Answer:
The masses of stars are found by measurements of
A) light intensity.
B) temperature.
C) Doppler shifting.
D) binaries.
E) relative sizes.
Answer:
Which of the following molecules is most likely to show the strongest hydrogen
bonding?
A) CH3OH
B) CH3SH
C) CH4
D) H-C C-H
E) A, B and C
Answer:
What was Niels Bohr's explanation for the observation of atomic spectra?
A) Electrons could only move in discrete energy steps within an atom.
B) Electrons could not move in an atom.
C) Any photon could excite an electron.
D) Only certain photons with the correct energy could excite the quanta in the nucleus.
E) Nucleons could be excited by different electron energies.
Answer:
Which of the following nuclear equations correctly describes beta emission?
A) U → Th + He
B) U → U + He
C) U → Pu + He
D) U → He
E) none of the above
Answer:
When the distance between two charges is halved, the electric force between the
charges
A) quadruples.
B) doubles.
C) is half.
D) is reduced by one-quarter.
E) none of the above
Answer:
The following statement describes which subatomic particle best?
It is located outside of the nucleus.
A) an electron
B) a proton
C) a neutron
D) A and B
E) B and C
Answer:
The geologic time scale is broken up into time units of different sizes based on
A) eons, eras, periods, and epochs.
B) changes in fossilization.
C) visible and nonvisible life forms.
D) major changes in life forms.
Answer:
Why are there few odors emanating from a properly managed composting toilet?
A) Tight seals prevent the escape of odors.
B) Odors are absorbed by a layer of water.
C) Decomposition is aerobic.
D) The ventilation system steers odors through a carbon filter.
Answer:
A pair of tennis balls fall through the air from a tall building. One ball is regular and the
other is filled with lead pellets. Air resistance just before they hit is greater for the
A) regular ball.
B) lead-filled ball.
C) same for both
Answer:
A block is dragged at constant velocity across a level surface by a force of 6 N. What is
the force of friction between the block and the surface?
A) less than 6 N
B) more than 6 N
C) 6 N
D) not enough information
Answer:
Which of the following can be classified as matter?
A) water
B) sand
C) perfume
D) ice cream
E) all of the above
Answer:
Which of the following statements about strong and weak acids is not true?
A) A weak acid is as corrosive as a strong acid.
B) A weak acid dissociates in water.
C) A strong acid will react with a strong base.
D) A weak acid will react with a strong base.
E) All of the above are untrue.
Answer:
If an alcoholic beverage has a proof of 151, what is the percentage of alcohol in the
beverage?
A) 75.5 percent
B) 151 percent
C) 15.1 percent
D) Proof is a measure of flammability.
E) Proof is a measure of the age of a fermented beverage.
Answer:
Compared with the power input to an ideal transformer, the power output is
A) greater.
B) less.
C) either greater or less.
D) the same.
Answer:
A flask brim filled with water is on a weighing scale. If you float a piece of wood in it,
after spillage away from the scale, the scale reading will be
A) less.
B) the same.
C) greater.
Answer:
Which of the following boxes represents a suspension?
A) Only A represents a suspension.
B) Only B represents a suspension.
C) Only C represents a suspension.
D) Each of these could represent a submicroscopic portion of a suspension.
Answer:
Tidal forces in general are the result of
A) two or more sources of gravitation.
B) a combination of any kind of forces acting on a body.
C) unequal forces acting on different parts of a body.
D) the inverse-square law.
E) unequal fluid flow.
Answer:
What did Galileo incorporate in his study of motion that Aristotle overlooked?
A) the role of distance
B) the role of time
C) the role of space
D) none of the above
Answer:
Nanotechnology and microtechnology are similar in that they both
A) are interdisciplinary.
B) have huge impacts on society.
C) are relatively new technologies.
D) all of the above
Answer:
Magnetism is due to the motion of electrons as they
A) move around the nucleus.
B) spin on their axes.
C) both of these
D) neither of these
Answer:
If the Moon were four times as massive but twice as far from Earth, high tides on Earth
would be
A) higher.
B) lower.
C) no different.
Answer:
Rocks formed by cooling from a molten state are
A) precipitated rocks.
B) igneous rocks.
C) sedimentary rocks.
D) metamorphic rocks.
Answer:
A straw is used for a pea shooter. When you blow through the straw the speed of the
emerging pea will be greater if the straw is
A) cut in half.
B) full length.
C) either cut in half or full length.
Answer:
The resistive force of friction occurs for
A) solids.
B) liquids.
C) gases.
D) all of the above
Answer:
Since atoms are mostly empty space, why don't objects pass through one another?
A) The electrons on the atoms repel other electrons on other atoms when they get close.
B) The nucleus of one atom repels the nucleus of another atom when it gets close.
C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier.
D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.
Answer:
