A boat at anchor is rocked by waves whose crests are 40 m apart and with wave speed
10 m/s. These waves reach the boat once every
A) 400 s.
B) 30 s.
C) 4 s.
D) 0.25 s.
Answer:
In one word, account for water temperature exceeding 100C in the power plant of a
nuclear submarine.
A) conductivity
B) evaporation
C) condensation
D) pressure
E) vaporization
Answer:
The ________ represents the complete range of frequencies of light energy from radio
waves to cosmic rays.
A) electromagnetic spectrum
B) electron configuration
C) probability cloud
D) frequency dependence
E) spectroscopic model
Answer:
The force exerted on the tires of a car to directly accelerate the car along a road is
exerted by the
A) engine.
B) tires.
C) air.
D) road.
E) none of the above
Answer:
Hydrogen, like electricity, is
A) an energy source.
B) not an energy source.
C) a source of both thermal and electric power.
Answer:
A compression is a squash and a rarefaction is a
A) crunch.
B) reverse tension.
C) stretch.
Answer:
Pangaea formed during the Paleozoic and broke up in the Mesozoic. Of all the former
continental unions that existed in Paleozoic time, only that of
A) Australia and Antarctica has survived to the present time.
B) Africa and India has survived to the present time.
C) North and South America has survived to the present time.
D) Europe and Asia has survived to the present time.
Answer:
The element silicon has a melting point of 1,410C and a boiling point of 2,355C. It is a
weak conductor of electricity, its density is 2.3 grams per cubic centimeter and it easily
forms silicon dioxide when exposed to air. Which of the following is a chemical
property of silicon?
A) its ability to conduct electricity
B) its density
C) its melting point
D) its ability to react with oxygen
E) C and D
Answer:
The force of gravity on a satellite in circular orbit doesn’t change its speed because the
force is
A) small compared to other forces on it.
B) canceled by centrifugal force.
C) perpendicular to its direction of motion.
D) very weak due to altitude.
Answer:
According to the impulse-momentum relationship Ft = change in mv, a falling baseball
hits a player with a force F. The t in the equation is the time
A) the ball falls before hitting the player.
B) of contact of the ball hitting the player.
C) of reflex as the player responds to being hit.
D) all of the above
E) none of the above
Answer:
Flowing water erodes stream channels by
A) chemical weathering.
B) hydraulic action and abrasion.
C) chemical weathering, hydraulic action, and abrasion.
D) channel erosion and abrasion.
Answer:
Three 10-ohm resistors take the shape of a triangle, one resistor in each leg. An
ohm-meter across any two points of the triangle will show the equivalent resistance to
be
A) 1.4 ohms.
B) 5 ohms.
C) 6.7 ohms.
D) greater than 6.7 ohms.
Answer:
In general, the friction forces between one object and another act
A) in the same direction.
B) in opposite directions.
C) at right angles to each other.
D) none of the above
Answer:
The Large Megllanic Cloud is
A) a bright nebula within our galaxy.
B) an irregular galaxy colliding with the Milky Way.
C) the farthest known object visible to the naked eye in a clear night time sky.
D) an unusually bright planetary nebula.
Answer:
If a light signal and a radio signal were emitted simultaneously from the Moon, the first
signal to reach Earth would be
A) radio.
B) light.
C) both of these
D) none of the above
Answer:
The Permian extinction predominantly affected
A) reptiles.
B) marine life.
C) insects life.
D) terrestrial life.
Answer:
A pair of protons in an atomic nucleus repel each other, but they are also attracted to
each other. Why?
A) The pair repel each other by nuclear force but attract one another by an electrical
force.
B) The pair repel each other since they are both positively charges but they are held
together by much stronger forces known as quarks.
C) The pair attract each other by nuclear force but also repel one another by a weaker
electrical force.
D) Although it is known that protons repel each other at short distances because of like
charge, it is not known what actually holds protons together in the nucleus because we
have never seen the nucleus of an atom.
Answer:
To say you can never change only one thing means that when you change something,
A) some other thing or things change.
B) only one other thing will change.
C) you can’t reverse it.
Answer:
The break-up of Pangaea resulted in the separation of
A) habitats.
B) landmasses.
C) plant and animal life.
D) landmasses, and plants and animals and their habitats.
Answer:
An object is placed exactly halfway between the Earth and the Moon. The object will
fall toward the
A) Earth.
B) Moon.
C) neither
Answer:
A floating leaf oscillates up and down twice in 1 s as a water wave of wavelength 10 m
passes by. What is the wave’s speed?
A) 2 m/s
B) 10 m/s
C) 20 m/s
D) 40 m/s
E) more than 40 m/s
Answer:
If you toss a ball straight upward at 40 m/s with no air resistance, 6 seconds later its
speed is
A) zero.
B) 10 m/s.
C) 20 m/s.
D) 30 m/s
E) 40 m/s.
Answer:
A 30-kg girl on friction-free roller blades pushes away a 25-kg boy also on roller blades
at 1 m/s. The girl’s speed is
A) 0.45 m/s.
B) 0.55 m/s.
C) 0.83 m/s.
D) 1.2 m/s.
Answer:
The melting point of silicate minerals is strongly dependent on the amount of silica it
contains. The first minerals to melt are those with
A) lowest melting point and lowest silica content.
B) lowest melting point and highest silica content.
C) lowest silica content and highest melting point.
D) highest silica content and highest melting point.
Answer:
How does formula mass differ from atomic mass?
A) They represent the same thing.
B) The formula mass of a substance is the sum of the atomic masses of the elements is
its chemical formula. The atomic mass is the mass of a single atom.
C) The atomic mass of a substance is the sum of the formula masses of the elements is
its chemical formula. The atomic mass is the mass of a single atom.
D) The formula mass is the mass of the chemical formula and the atomic mass is the
mass of the molecule.
Answer:
How many grams of water can be formed from the reaction between 10 grams of
oxygen and 1 gram of hydrogen?
A) 11 grams of water are formed since mass must be conserved.
B) 10 grams of water are formed since you can’t get a greater mass of water produced
than oxygen reacting.
C) 9 grams of water are formed because oxygen and hydrogen react in an 8:1 ratio.
D) No water is formed because there is insufficient hydrogen to react with the oxygen.
Answer:
Spun glass is a relatively
A) good conductor.
B) poor conductor.
C) both about the same
Answer:
Since magnetic force on a moving electron is always perpendicular to its direction of
motion, magnetic force is unable to change an electron’s
A) speed.
B) direction.
C) speed and direction.
D) none of the above
Answer:
At lower elevations the air is generally
A) warm and heavy.
B) warm and light.
C) cool and heavy.
D) cool and light.
Answer:
If electrons were positive and protons were negative, Coulomb’s law would be written
A) the same.
B) somewhat differently.
C) very differently.
Answer:
Rivers tend to flow
A) southward.
B) downhill due to gravity.
C) northward.
D) toward the Equator.
Answer:
When you simultaneously drop a light tennis ball and a heavy bowling ball, they hit the
floor
A) at the same speed.
B) with the same force.
C) with the same momentum.
D) all of the above
E) none of the above
Answer:
A whitish sky is evidence that the atmosphere contains
A) predominantly small particles.
B) predominantly large particles.
C) a mixture of particle sizes.
D) pollutants.
Answer:
Compressions and rarefactions are characteristic of
A) longitudinal waves.
B) transverse waves.
C) both of these
D) none of the above
Answer:
The Sun is spherical due to
A) Earth circling it.
B) Earth and Moon circling it.
C) gravitation.
D) none of the above
Answer: