The volume of water that flows past a given point in a channel during a specified time
is called
A) load.
B) gradient.
C) discharge.
D) runoff.
Answer:
A parachutist falling at constant velocity is in a state of
A) dynamic equilibrium.
B) non-dynamic equilibrium.
C) being in and out of dynamic equilibrium.
D) none of the above
Answer:
A 2-kg rifle is horizontally suspended by a pair of strings so that recoil can be
measured. The rifle fires a 0.001-kg bullet at a speed of 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 the above
Answer:
Which of the following statements about catalysts is NOT true?
A) A catalyst alters the rate of a chemical reaction.
B) A catalyst can be consumed in a reaction as long as it is regenerated.
C) A catalyst can be used to speed up slow reactions.
D) A catalyst does not change the energy of the reactants or the products.
E) All of the above are true.
Answer:
The support force on a 10-N book that rests on a horizontal surface is
A) less than 10 N.
B) 10 N.
C) greater than 10 N.
D) dependent on whether the book lies flat or stands upright.
Answer:
If the part of an iceberg that extends above the water were suddenly removed, the
A) iceberg would sink.
B) buoyant force on the iceberg would soon decrease.
C) density of the iceberg would change.
D) pressure on the bottom of the iceberg would increase.
E) none of the above
Answer:
Which of the following compounds contains ionic bonds?
A)
B) O
C)
D)
E) none of the above
Answer:
The most common outpouring of lava occurs as
A) volcanic eruptions.
B) carbonates.
C) conglomerates.
D) fissure eruptions.
Answer:
Which of the following molecules contains a polar bond?
A) H-F
B) Cl-Cl
C) H-H
D) F-F
E) all of the above
Answer:
A mosquito flying at 3 m/s encounters a 3-m/s breeze blowing in the opposite direction,
which gives it a resulting speed over the ground of
A) 0 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
Answer:
To date the age of Earth, we look for rocks with a high percentage of
A) uranium-235 to lead-207.
B) uranium-238 to lead-206.
C) potassium-40 to argon-40.
Answer:
How does a suspension differ from a solution?
A) A suspension is a heterogeneous mixture whose components can be separated by
simple filtration. A solution is a homogeneous mixture which cannot be separated by
simple filtration.
B) A suspension is a heterogeneous mixture consisting of different phases whereas a
solution is a homogeneous mixture consisting of a single phase.
C) Although a solution and suspension are both homogeneous mixtures, only the
components of a suspension will separate by spinning the mixture in a centrifuge.
D) The difference between a suspension and a solution can only be determined by
chemical means.
Answer:
Flowing surface water alters the landscape in what ways?
A) erosion
B) deposition of sediments
C) weathering
D) It weathers and erodes sediments, and then it deposits sediment.
Answer:
crystals are composed of
A) units of molecules held together by dipole interactions.
B) groups of ions and molecules.
C) units composed of six Mg atoms and six molecules.
D) a multitude of ions and ions grouped together in a three-dimensional array
with a 1:2 ratio of to .
E) a two-dimensional array of [-Mg-Cl-Cl-] units.
Answer:
To keep chickens warm in a shed on a cold night, it is best to use
A) an incandescent lamp.
B) a fluorescent lamp.
C) an LED lamp.
D) a CFL lamp.
Answer:
Long ago a runaway greenhouse effect greatly transformed the planet
A) Mercury.
B) Venus.
C) Mars.
D) none of the above
Answer:
When you jump from an elevated position you usually bend your knees upon reaching
the ground. By doing this, the contact time is about 10 times more than for a
stiff-legged landing and the average force your body experiences is reduced by
A) less than 10 times.
B) more than 10 times.
C) about 10 times.
Answer:
Layers of limestone in a rock outcrop often indicate that the area had at some time been
A) near the site of volcanic activity.
B) glaciated.
C) covered by water.
D) a desert area.
Answer:
A 10-kg block is pushed across a horizontal surface with a horizontal force of 30 N
against a friction force of 10 N. The acceleration of the block is
A) 1 m/s2.
B) 2 m/s2.
C) 5 m/s2.
D) 10 m/s2.
E) none of the above
Answer:
A 1000-kg car and a 2000-kg car are hoisted the same vertical distance in a service
station. Raising the more massive car requires
A) less work.
B) as much work.
C) twice as much work.
D) four times as much work.
E) more than four times as much work.
Answer:
Which of the following statements describes an acidic solution?
A) [H3O+] > [OH–]
B) [H3O+] < [OH–]
C) [H3O+] [OH–] ≠ 1 10-14
D) [H3O+]/[OH–] = 1 10-14
E) [H3O+]/[OH–] = 1
Answer:
A wave with a long wavelength has a relatively
A) low frequency.
B) high frequency.
C) both of these
D) neither
Answer:
The source of all sounds is something that is
A) accelerating.
B) moving.
C) vibrating.
D) undergoing simple harmonic motion.
Answer:
The bob of a simple pendulum has its maximum kinetic energy at the
A) top of its swing.
B) bottom of its swing.
C) midpoint between top and bottom of its swing.
D) at all points along its path of swing.
Answer:
Which of the following is an example of a chemical change?
A) gasoline being used in the engine of a car producing exhaust
B) water freezing into ice crystals
C) aftershave or perfume on your skin generating a smell
D) a piece of metal expanding when heated, but returning to original size when cooled
E) breaking a glass window
Answer:
The formation of more protons than neutrons (at about a 7:1. ratio) was favored in the
early universe because
A) it takes more energy to create a neutron from a proton than a proton from a neutron.
B) it takes more energy to create a proton from a neutron than a neutron from a proton.
C) the more massive neutrons made better targets for nucleon collisions.
D) the positively charged protons were repelled away from the explosion.
Answer:
Which will cool faster when removed from a furnace?
A) iron
B) silver
C) the same
Answer:
A refrigerator delays the spoilage of food by
A) killing microorganisms.
B) slowing down the rate of chemical reactions within microorganisms.
C) expanding the water found within microorganisms.
D) diminishing the supply of oxygen to microorganisms.
Answer:
Mohs scale is based on minerals that have different
A) cleavage directions.
B) colors.
C) hardness.
D) shapes.
Answer:
Volcanic rocks form from
A) the eruption of viscous magma.
B) partial melting of basalt.
C) solidification of lava.
Answer: