Which of the following statements is untrue?
A) Covalent molecules are never crystalline.
B) Covalent molecules usually have low melting points.
C) Covalent molecules can have nonbonding electrons.
D) Covalent bonds can involve more than one pair of electrons.
E) All of the above statements are true.
Answer:
Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a
wall, the wall doesn’t slam into you at 30 km/s because the wall
A) has too little gravity to influence you.
B) moves in the opposite direction to you.
C) and you move at the same horizontal speed, before, during, and after your jump.
D) has negligible inertia compared with the Sun.
Answer:
A hunter aims a rifle at an angle of 10 below the horizontal. The hunter fires a bullet
while simultaneously dropping another bullet from the side of the rifle. The bullet to hit
the ground first is
A) the dropped one.
B) the fired one.
C) both hit at the same time
Answer:
A superconducting electromagnet makes use of
A) zero resistance coils of wire.
B) super-high temperatures.
C) high-speed electrons.
D) close packing of high-density magnetic domains.
Answer:
Heat is simply another word for
A) temperature.
B) thermal energy.
C) both of these
D) none of the above
Answer:
When light from air passes through a prism, light of all frequencies
A) slow down.
B) remain at speed c.
C) speed up.
D) none of the above
Answer:
The five principles used to determine the relative ages of rock include original
A) horizontality, superposition, cross cutting, inclusion, and faunal succession.
B) horizontality, nonconformity, cross cutting, inclusion, and faunal succession.
C) inclusion, superposition, uniformitarianism, horizontality, and fossil succession.
D) horizontality, uniformitariansism, cross cutting, stromatolite, and faunal succession.
Answer:
Is the following transformation representative of a physical change or a chemical
change?
A) chemical change because of the formation of elements
B) physical change because a new material has been formed
C) chemical change because the atoms are connected differently
D) physical change because of a change in phase
Answer:
The object with a natural frequency of higher pitch is a
A) small bell.
B) large bell.
C) either of these
D) none of the above
Answer:
What Einstein discovered about space and time is that they
A) are separate entities.
B) are parts of one whole.
C) follow an inverse-square law.
D) are special to space travelers.
Answer:
A shopping cart moves with a kinetic energy of 40 J. If it moves at twice the speed, its
kinetic energy is
A) 40 J.
B) 80 J.
C) 160 J.
D) not enough information
Answer:
When a light beam emerges from water into air, the average light speed
A) increases.
B) decreases.
C) remains the same.
Answer:
As more and more mass falls into a black hole, the radius of its photon sphere
A) increases.
B) decreases.
C) remains unaffected.
Answer:
An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the
circuit can accommodate 15 A of current. How many heaters can be safely operated in
the circuit?
A) 2
B) 3
C) 4
D) 5
E) more than 5
Answer:
A popular swinging-balls apparatus (Newton’s cradle) consists of a series of identical
elastic balls suspended by strings so they barely touch each other. When two balls are
pulled away from one end and released, they strike the row of balls and two balls pop
out from the other end. If instead, one ball popped out with twice the speed, this would
violate the conservation of
A) momentum.
B) energy.
C) both of these
D) none of the above
Answer:
Discuss the formation of the winter and summer monsoon in India.
Answer:
Which has the greater density, a lake full of water or a cupful of lake water?
A) the cupful of lake water
B) the lake
C) both have the same density
Answer:
Electric field lines about a point charge extend
A) outward when the charge is negative.
B) outward when the charge is positive.
C) in circles.
Answer:
Ohm’s law tells us that the amount of current produced in a circuit is
A) directly proportional to voltage.
B) inversely proportional to resistance.
C) both of these
D) neither of these
Answer:
Movement of water erodes stream channels. The main source of erosion comes from
A) physical abrasion.
B) chemical erosion.
C) laminar flow.
D) lithification.
Answer:
The Earth’s magnetic field
A) never appreciably changes.
B) has reversed itself many times.
C) is centered at Earth’s core.
D) both B and C
Answer:
When you place a sealed can of air on a hot stove, air in the can undergoes an increase
in
A) thermal energy.
B) temperature.
C) pressure.
D) all of the above
E) none of the above
Answer:
When Ra decays by emitting an alpha particle, what is the atomic number of the
resulting nucleus? What is the resulting atomic mass?
A) atomic number = 86; atomic mass = 222
B) atomic number = 87; atomic mass = 226
C) atomic number = 86; atomic mass = 224
D) atomic number = 87; atomic mass = 224
Answer:
A rising parcel of air continues to rise as long as
A) the wind is blowing.
B) it is warmer and less dense than the surrounding air.
C) the temperature is inverted.
D) it is cooler and denser than the surrounding air.
Answer:
How is it possible to deduce the identity of an element from its electron configuration?
A) The number of occupied shells corresponds to the atom’s atomic number.
B) If the atom is electrically neutral, the number of electrons corresponds to the atom’s
atomic number.
C) Using the periodic table, the outermost occupied shell indicates the group while the
number of occupied shells indicates the period.
D) An electron configuration is unique to each element, much like its atomic spectrum.
Answer:
Which of the following would cost the least to purify by reverse osmosis?
A) agricultural runoff
B) sea water
C) brackish water
D) All of the above are the same.
E) None of the above can be purified by reverse osmosis.
Answer:
For the following acid-base reaction, identify what compound is formed in the space
marked.
HCl + KOH ???? + H⇌2O
A) KCl
B) H3OCl
C) KOH2
D) KOH2Cl
E) none of the above
Answer:
When we see a half-moon, the position of the Sun is
A) almost directly behind the Moon.
B) almost directly behind the Earth.
C) at right angles to a line from Earth to the Moon.
D) about 45 from a line from Earth to the Moon.
Answer:
A 2500-N pile driver ram falls 10 m and drives a post 0.1 m into the ground. The
average force on the post is
A) 2500 N.
B) 25,000 N.
C) 250,000 N.
D) 2,500,000 N.
Answer:
In his special theory of relativity, Einstein stated that the laws of physics are
A) different in different situations.
B) common sense applied to microscopic and macroscopic things.
C) the same in all frames of reference.
D) the same in all uniformly moving frames of reference.
Answer:
A red-hot piece of iron will cool slower in a
A) cold room.
B) warm room.
C) same in each
Answer:
Whenever the net force on an object is zero, its acceleration
A) may be zero.
B) is zero.
C) and velocity are the same.
D) none of the above
Answer:
If a water well is actively pumped, the water table will
A) be raised around the well.
B) stay at the same level as before pumping.
C) be depressed around the well.
D) be recharged.
Answer:
List the following compounds in order of increasing boiling point: , , , .
A) , , ,
B) , , ,
C) , , ,
D) , , ,
Answer:
Which of the following is not a heteroatom?
A) O
B) N
C) P
D) A and B
E) All of the above are heteroatoms.
Answer: