Air becomes saturated when its temperature
A) falls to a point where water vapor molecules evaporate.
B) rises to a point where water vapor molecules condense.
C) rises to a point where water vapor molecules evaporate.
D) falls to a point where water vapor molecules condense.
Answer:
What is the upper limit of stars the unaided eye can discern on a moonless night in a
rural area?
A) about 3000
B) about 30,000
C) about 300,000
D) about 3,000,000
Answer:
Escape speed for a rocket is less from
A) Earth.
B) the Moon.
C) the Sun.
D) same for each
Answer:
What is the resistance of a 120-W incandescent lamp connected to a 120-V power
supply?
A) 1 ohm
B) 60 ohms
C) 100 ohms
D) 144 ohms
E) none of the above
Answer:
What is the relationship between wave frequency and period? What is the period, in
seconds, that corresponds to each of the following frequencies: (a) 10 Hz, (b) 0.2 Hz,
(c) 60 Hz?
Answer:
If you exert 6 N across a distance of 2 m in 3 s you’ll deliver a power of
A) 1 W.
B) 3 W.
C) 4 W.
D) 6 W.
E) more than 6 W
Answer:
The rainy monsoonal climate of the Tibetan highlands results from
A) strong off-shore winds in the summer.
B) a strong temperature contrast and pressure gradient from warm air over the
highlands and cool air over the oceans.
C) a strong temperature contrast and pressure gradient from cool air over the highlands
and warm air over the oceans.
D) none of these
Answer:
What is a hydrocarbon?
A) It is a molecule composed of carbon and hydrogen only.
B) It is a wet carbon atom.
C) It is any organic molecule.
D) It is a molecule derived from hydrogen synthesis.
E) none of the above
Answer:
For the crystallization of minerals from a magma, melting point determines which
mineral will form first. For evaporite minerals
A) solubility determines which mineral will form first.
B) salinity determines which mineral will form first.
C) melting point also determines which mineral will form first.
D) there is no single determinant. All evaporite minerals precipitate at the same time.
Answer:
The statement, “There are regions beneath the Earth’s crust that will always be beyond
the reach of scientific investigation,” is
A) a fact.
B) speculation.
C) a scientific statement.
D) a theory.
Answer:
The vibrating system with the greatest frequency has the
A) shortest period.
B) longest period.
C) both of these
D) none of the above
Answer:
A given net force propels an object along a straight-line path. If the mass were doubled,
its acceleration would
A) quadruple.
B) double.
C) stay the same.
D) be half.
E) none of the above
Answer:
Light is emitted as an electron transitions from a higher energy state to a lower energy
state. How long does it take for the actual transition to take place?
A) several seconds
B) several microseconds
C) several nanoseconds
D) no time at all
Answer:
The minimum or no magnetic force on a moving electron occurs for motion
A) parallel to the magnetic field.
B) perpendicular to the magnetic field.
C) at non-right angles to the magnetic field direction.
Answer:
Why is it important to conserve fresh water?
A) There is little fresh water available to us on our planet.
B) As the human population grows, so does our need for fresh water.
C) It is expensive to purify nonpotable water.
D) all of the above
Answer:
Which of the following statements is true about Bohr’s planetary model of the atom?
A) The electrons actually orbit around the nucleus.
B) It is a physical model.
C) The energy difference between the orbits is continuous.
D) The electrons smoothly move from one orbit to the next.
E) none of the above
Answer:
Why might softened water not be good for some one who is trying to reduce their
dietary sodium ion intake?
A) The potassium used in the softener to replace the calcium and magnesium ions
increases the sodium retention in the body.
B) Water softeners work by replacing the calcium and magnesium ions of the water
with sodium ions; softened water contains increased levels of sodium ions.
C) The softened water leaches sodium from the body, so a person might not be getting
the dietary recommended levels of sodium.
D) A person needs a certain level of calcium and magnesium in the water to help
excrete the sodium from their body.
Answer:
The infiltration of water is greatest in
A) calcite-cemented sandstone.
B) sandy soil.
C) clay soil.
D) silica-cemented sandstone.
Answer:
Coastal winds that shift from night to day illustrate
A) conduction.
B) convection.
C) radiation.
D) all about equally
Answer:
As water changes to ice, water molecules
A) absorb energy.
B) release energy.
C) retain their energy.
D) lose the quality of wetness.
Answer:
Why is the formation of iron hydroxide, Fe , from and O not considered an
oxidation-reduction reaction?
A) The iron is only oxidized and nothing is reduced.
B) The iron is only reduced, not oxidized.
C) The ion is not changed during this chemical reaction.
D) Iron can never be oxidized or reduced.
Answer:
The following image represents which kind of matter?
A) a mixture
B) a compound
C) an element
D) none of the above
E) all of the above
Answer:
The rate at which a transformer transfers energy is called
A) electromagnetic induction.
B) transformer efficiency.
C) power.
Answer:
What is the chemical formula for the following structure?
A)
B)
C)
D)
Answer:
Which of the following types of radiation might be best for medical imaging?
A) Gamma radiation would be best because it penetrates the best.
B) Alpha radiation would be best because it penetrates the least and therefore does the
least damage.
C) Beta radiation would be best because it can be measured electrically.
D) Only X-rays are used for medical imaging.
E) none of the above
Answer:
The banded iron formations began to form when
A) carbon dioxide dissolved in seawater.
B) varying oxygen levels allowed the precipitation of alternating layers of iron oxide.
C) oxide minerals were deposited on the ocean bottom.
D) iron from lava flows settled into layered formations.
Answer:
The majority of earthquakes occur where
A) lithospheric plates meet.
B) the asthenosphere touches the lithosphere.
C) the land surface is made of unconsolidated sediments.
D) narrow zones of land touch.
Answer:
If you carry a heavy bag of groceries and bang your hand against the wall, the concept
that best explains why your hand hurts is
A) inertia.
B) gravity.
C) resistance.
D) none of the above
Answer:
What is the activation energy?
A) the minimum amount of energy to break the bonds in reactants
B) the amount of energy required to activate a phase change
C) the energy difference between the reactants and the products
D) the amount of energy required to separate reactants from the products
E) the hill
Answer:
Light will not pass through a pair of Polaroids when their axes are
A) parallel.
B) perpendicular.
C) 45 to each other.
D) all of the above
E) none of the above
Answer:
Caves and caverns are formed in carbonate rock by
A) abrasive action of swift flowing groundwater.
B) reaction of carbonic acid released into the groundwater.
C) stalactites and stalagmites.
D) all of these
Answer:
Which has greater kinetic energy: a car traveling at 30 km/h or another car of half the
mass traveling at 60 km/h?
A) The 30-km/h car
B) The 60-km/h car
C) both have the same kinetic energy
Answer: