A motor scooter undergoes acceleration when it
A) gains speed.
B) decreases speed.
C) changes direction.
D) all of the above
Answer:
A 10-N falling object encounters 4 N of air resistance. The net force on it is
A) 0 N.
B) 4 N.
C) 6 N.
D) 10 N.
Answer:
What would be the best explanation for the fact that most natural water has a pH of
about 5.6?
A) Carbon dioxide reacts with water to form an acid.
B) Air contains acid rain particles.
C) Minerals that are dissolved in water are often acidic.
D) Many salts that dissolve in natural waters make the water basic.
E) none of the above
Answer:
The surface of Comet 67P/CG as detected by the Rosetta mission is best described as
A) smooth with parallel striations.
B) smooth with many hilly areas.
C) rough with cracks and crevices.
D) rough with many craters.
Answer:
Several paper clips dangle from the north pole of a magnet. The induced pole in the
bottom of the lowermost paper clip is a
A) north pole.
B) south pole.
C) either of these
D) neither of these
Answer:
The color of an object depends on the colors of
A) the light that illuminates them.
B) molecules that comprise them.
C) the foreground.
Answer:
The medium in which a wave travels
A) moves along with the wave.
B) transmits the wave.
C) inhibits the wave.
D) reflects the wave.
Answer:
A 1056-Hz tuning fork is sounded when a piano note is struck. You hear three beats per
second. What is the frequency of the piano string?
A) 1053 Hz
B) 1056 Hz
C) 1059 Hz
D) 2112 Hz
E) need more information
Answer:
Andesitic magma produces
A) andesite rocks.
B) granitic rocks.
C) basaltic rocks.
D) metamorphic rocks.
Answer:
A 100-W lamp glows brighter than a 25-W lamp. The electric resistance of the 100-W
lamp is
A) less.
B) greater.
C) the same.
Answer:
Water pressure at the bottom of a lake depends on the
A) weight of water in the lake.
B) surface area of the lake.
C) depth of the lake.
D) all of the above
Answer:
Which of the following elements is an alkali metal?
A) argon (Ar)
B) lead (Pb)
C) cerium (Cr)
D) indium (In)
E) lithium (Li)
Answer:
The “redshift” of a galaxy refers to the rate
A) at which is receding.
B) at which it is approaching.
C) at which it is spinning.
D) of its fusion.
Answer:
The mid-oceanic ridge systems in the Atlantic and Pacific oceans are
A) high points in the ocean basins where new crust is being made.
B) the tallest features in Earth’s ocean basins.
C) some of the oldest rock formations on Earth’s surface.
Answer:
Which of the following is a major advantage of nuclear-fission-based power plants?
A) The amount of energy per kilogram of fuel is greater than any other fuel source.
B) The byproducts of the fission process are radioactive and have very long half-lives.
C) The reactors can be used to produce their own fuel.
D) The power plants are complex and there are many safety requirements to prevent
contamination of the environment.
E) A and C
Answer:
A length of wire has resistance R. The same kind of wire twice as long has resistance
A) R/2.
B) R.
C) 2R.
D) none of the above
Answer:
The planet Earth loses heat primarily by
A) conduction.
B) convection.
C) radiation.
D) all of the above
E) none of the above
Answer:
Compared with the current in the primary coil of a transformer, the current in the
secondary coil
A) is greater.
B) is less.
C) can be greater or less.
D) none of the above
Answer:
The relative movement of a strike-slip fault is
A) left to right.
B) right to left.
C) horizontal.
D) vertical.
Answer:
A shock wave is produced when the speed of an object
A) matches the speed of sound in air.
B) exceeds the speed of sound in air.
C) greatly increases in amplitude.
D) none of the above
Answer:
When lightning strikes, nitrogen molecules, , and oxygen molecules, , in the air
react to form nitrates, , which come down in the rain to help fertilize the soil. Is ⁻
this this an example of oxidation or reduction?
A) The formation of nitrates is an example of oxidation.
B) The formation of nitrates is an example of reduction.
C) Both. The nitrogen is oxidized as it reacts with the oxygen while the oxygen is
reduced.
D) Neither. Although the bonds of both the and molecules are broken to form the
, neither oxidation nor reduction occurs.
Answer:
Arrange the following images of an aqueous base solution in order of increasing base
strength:
A) A, B, C
B) B, C, A
C) C, B, A
D) A, C, B
E) All are equally strong.
Answer:
The scientist first credited for discovering the concept of inertia was
A) Aristotle.
B) Galileo.
C) Newton.
D) Copernicus.
Answer:
The extremely hot temperature of the thermosphere has very little significance because
A) the dense air molecules in this region move too quickly to absorb much solar
radiation.
B) there is very little ozone in the air to absorb the solar radiation.
C) there are not enough air molecules and atoms colliding with one another to generate
heat energy.
D) the thermosphere is very far from Earth’s surface.
Answer:
Which of the following is an example of adiabatic warming?
A) cyclone
B) Chinook
C) drought
D) tornado
Answer:
During a single period, the distance traveled by a wave is
A) one-half wavelength.
B) one wavelength.
C) two wavelengths.
D) more information is needed
Answer:
Cepheids are types of stars that regularly change how bright they are over a period of a
few
A) days.
B) months.
C) year.
D) decades.
Answer:
A kilogram is a measure of an object’s
A) weight.
B) force.
C) mass.
D) gravity.
Answer:
Two objects move toward each other due to gravity. As the objects get closer and closer,
the force between them
A) increases.
B) decreases.
C) remains constant.
Answer:
According to the following reaction, which molecule is acting as a base?
OH– + NH4
+ → H2O + NH3
A) H2O
B) NH3
C) OH–
D) NH4
+
E) none of the above
Answer:
A blob of material in outer space moves at 3 m/s when it collides and sticks to a
half-as-massive blob initially at rest. Compared with the initial kinetic energy of the
3-m/s blob, the kinetic energy of the coupled blobs is
A) one-third.
B) two-thirds.
C) three-quarters.
D) not enough information
Answer:
Which bond is most polar?
A) H-N
B) N-C
C) C-C
D) O-H
Answer: