An ice cube that contains small pieces of iron floats on water. When the ice melts, the
water level
A) rises.
B) falls.
C) remains unchanged.
Answer:
Earth satellites are typically more than 100-km high so as to mainly be above the
Earth’s
A) atmosphere.
B) gravitational influence.
C) both of these
D) none of the above
Answer:
Solar power is commonly used to produce
A) heat.
B) electricity.
C) both of these
Answer:
Which of the following statements about radiation is true?
A) Radiation can be a useful tool. Like fire, it is only dangerous when misused.
B) Radiation is new: It is a man-made phenomenon.
C) Radiation has no beneficial health applications.
D) all of the above
E) only A or B
Answer:
The force of friction on a sliding object is 50 N. The applied force needed to maintain a
constant velocity is
A) more than 50 N.
B) less than 50 N.
C) 50 N.
Answer:
After a ball tossed upward leaves your hand, the force of gravity on it
A) no longer acts.
B) gradually diminishes.
C) gradually increases.
D) remains constant.
E) changes direction.
Answer:
According to the following reaction, which molecule is acting as a base?
H3O+ + HSO4
– → H2O + H2SO4
A) H2SO4
B) H2O
C) H3O+
D) HSO4
–
E) none of the above
Answer:
Neptune was discovered by irregularities in the orbit of
A) Jupiter.
B) Saturn.
C) Uranus.
D) Pluto.
E) Earth.
Answer:
More current will occur in a lamp when its filament is
A) cold.
B) hot.
C) either cold or hot.
Answer:
Complete the following nuclear equation:
?? → Rn + He
A) Ra
B) At
C) Po
D) Rn
E) none of the above
Answer:
Which interacts more with sounds of relatively high frequencies?
A) large bells
B) small bells
C) both the same
Answer:
Phil stands at rest with both feet on a scale that reads 500 N. After he gently lifts one
foot, the scale reads
A) less than 500 N.
B) 500 N.
C) more than 500 N.
Answer:
On a floodplain, stream flow is generally
A) laminar.
B) turbulent.
C) meandering.
D) channeled.
Answer:
On which temperature scale is 0 degrees the freezing point of water?
A) Celsius
B) Caloric
C) Kelvin
D) Fahrenheit
E) none of the above
Answer:
The fastest moving planet in a solar system is the
A) smallest planet.
B) most massive planet.
C) planet nearest the Sun.
D) planet farthest from the Sun.
E) none of the above
Answer:
Why are the atomic masses listed in the periodic table not whole numbers?
A) Scientists have yet to make the precise measurements.
B) That would be too much of a coincidence.
C) The atomic masses are average atomic masses.
D) Today’s instruments are able to measure the atomic masses to many decimal places.
Answer:
What can be said about drinking water that is 99.9999 percent free of some poison, such
as a pesticide?
A) In each 10,000 parts of the contaminated water there is one part pesticide and 9999
parts pure water.
B) In each 100,000 parts of the contaminated water there is one part pesticide and
99,999 parts pure water.
C) The ratio of water molecules to pesticide molecules in the glass is so great that
drinking the water is not problematic.
D) The water is highly contaminated and surely not fit to drink.
Answer:
The original reactor built in 1942 was just “barely” critical because the natural uranium
that was used contained less than 1% of the fissionable isotope U-235 (half life 713
million years). What if, in 1942, the Earth had been 9 billion years old instead of 4.5
billion years old? Would this reactor have reached critical stage with natural uranium?
Why?
A) No. The age of the Earth has nothing to do with the reactor reaching critical stage
with U-235.
B) No. 1% of the fissionable isotope U-235 is insufficient for the reactor to reach
critical stage no matter what the age of the Earth.
C) Yes. If the Earth had been twice as old there would have then been twice as much
fissionable U-235 present and the reactor would have reached critical stage.
D) No. The increased age of the Earth would mean that there would be a much smaller
percentage of U-235, thus not enough for the reactor to reach critical stage.
Answer:
An object is pulled with two forces, 10 N northward and 15 N southward. The direction
of the net force is to the
A) north.
B) south.
C) east.
D) west.
E) none of the above
Answer:
Which type of radiationalpha, beta, or gammaresults in the greatest change in atomic
mass number?
A) alpha radiation
B) beta radiation
C) gamma radiation
D) They all result in the same change in atomic mass number.
Answer:
Within a stream channel, the speed of stream flow is greatest
A) at the bottom of the stream bed.
B) in the middle of the channel at the water’s surface.
C) at the channel sides.
D) mid-channel between the stream bed and the water’s surface.
Answer:
When a change of magnetic field occurs in a closed loop of wire,
A) a voltage is induced in the wire.
B) current is made to flow in the loop of wire.
C) electromagnetic induction occurs.
D) all of the above
E) none of the above
Answer:
Which of the above molecules is a ketone?
A) a
B) b
C) c
D) d
E) none of the above
Answer:
A flat piece of iron is tightly tied against top of a wooden block. The iron-wood block
floats in a bucket of water. If the iron-wood block flips over so the iron is on the
bottom, the water level at the side of the bucket
A) rises.
B) falls.
C) remains the same.
Answer:
A hydraulic device has two pistons, one with a small cross-section area and another
piston with a larger cross-section area. If a given force is applied to the small piston, the
output force on the larger-area piston will be
A) less.
B) the same.
C) greater.
D) all of the above
E) none of the above
Answer:
If you wish to spear a fish with a regular spear, you should compensate for refraction
and throw your spear
A) directly at the sighted fish.
B) above the sighted fish.
C) below the sighted fish.
Answer:
Dwarf planet Pluto was discovered by perturbations of
A) Jupiter.
B) Saturn.
C) Uranus and Neptune.
D) all of the above
Answer:
A block of ice sliding down an incline has one-quarter its maximum potential energy
A) one-quarter from the top.
B) one-quarter from the bottom.
C) three-quarters the way down.
D) need more information
Answer:
When steam condenses to water, energy is
A) absorbed.
B) released.
C) conserved as the phase change occurs.
D) transformed to a different form.
Answer:
A force of 1 N accelerates a 1-kg mass at 1 m/s2. The acceleration of a 2-kg mass acted
upon by a force of 2 N is
A) half as much.
B) twice as much.
C) the same.
D) none of the above
Answer:
It is commonly thought that a can of beverage will cool faster in the coldest part of a
refrigerator. Knowledge of Newton’s law of cooling
A) supports this.
B) contradicts this.
C) is unrelated to this.
Answer:
Common glacial landforms created of drift include moraines,
A) aretes, and drumlins.
B) drumlins, and roches moutonnees.
C) and drumlins.
D) roches moutonnees, and eskers.
Answer:
Why does an atom with many valence electrons tend to gain electrons rather than lose
any?
A) Atoms with many valence electrons tend to have relatively weak forces of attraction
between the valence electrons and the nucleus. Therefore, the outer electrons are free to
attract other electrons.
B) There is stability in numbers. Atoms with many valence electrons are always
attracting new electrons.
C) The old adage that “he who has, gets” is also true in atomic structure. Atoms with
many valence electrons can essentially overpower atoms with few valence electrons and
attract additional electrons.
D) Atoms with many valence electrons tend to have relatively strong forces of attraction
between the valence electrons and the nucleus. This makes it easy for them to gain
additional electrons.
Answer: