By definition, an ore is a mineral rich in valuable metals. To be considered as an ore
means that the
A) metals can be economically extracted to yield a profit.
B) metals are extremely valuable.
C) deposit is very rich and abundant in valuable metals.
D) metallic minerals are very abundant.
Answer:
The process where an element spontaneously changes into a different element
(transmutation) by a change in the nucleus of an atom is called
A) radiometric dating.
B) radioactive decay.
C) radiometric decay.
D) none of these
Answer:
A 1.00 carat pure diamond has a mass of 0.20 grams. How many carbon atoms are there
within this diamond?
A) 6.0 carbon atoms
B) 2.0 carbon atoms
C) 1.0 carbon atoms
D) 6.0 carbon atoms
Answer:
The theory that different forms of animals throughout Earth’s past occurred in a definite
order is called the principle of
A) fossil assemblage.
B) faunal succession.
C) conformable fossils.
D) fossil determination.
Answer:
Thermal convection movement in the upper mantle
A) generates the electric current that powers Earth’s magnetic field.
B) greatly influences Earth’s surface features.
C) heats Earth’s core by frictional forces.
D) is usually negligible.
Answer:
How many forces act on an upwardly tossed coin when it gets to the top of its path?
A) one; the force due to gravity
B) two; gravity and the force in the coin itself
C) three; gravity, the coin’s internal force, and a turnaround force
D) none of the above
Answer:
An object in free fall has a speed of 60 m/s. One second later its speed is
A) 10 m/s.
B) 30 m/s.
C) 60 m/s.
D) 70 m/s.
Answer:
An Earthquake occurs as
A) seismic waves travel to Earth’s surface.
B) energy released from Earth’s interior travels to Earth’s surface.
C) energy released at Earth’s surface travels to Earth’s interior.
D) seismic waves travel to Earth’s interior.
E) energy released from Earth’s interior travels in the form of seismic waves to Earth’s
surface.
Answer:
In which of the following molecules will water induce a temporary dipole?
A) CO2
B) O2
C) N2
D) all of the above
E) none of the above
Answer:
Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses.
B) vibrating electric and magnetic fields.
C) particles of light energy.
D) high-frequency sound waves.
Answer:
Most of Earth’s accessible fresh water is located in
A) polar ice caps and glaciers.
B) groundwater.
C) rivers, lakes, and streams.
D) the atmosphere.
Answer:
The identities of dark energy and dark matter are
A) unknown at this time.
B) subjects of intense astronomical interest.
C) both of these
D) neither of these
Answer:
The value of a resistor that carries 2 A when connected to 10 V is
A) 2 ohms.
B) 5 ohms.
C) 10 ohms.
D) 20 ohms.
E) more than 20 ohms.
Answer:
Distant galaxies are
A) growing closer to each other as they encounter the curvature of the universe.
B) accelerating away from each other.
C) slowing in their dispersal due to the effects of gravity.
D) connected to each other by dark energy.
Answer:
If a non-rotating object has no acceleration, then we can say for certain that it is
A) at rest.
B) moving at constant nonzero velocity.
C) in mechanical equilibrium.
D) all of the above
E) none of the above
Answer:
Light from inside a raindrop that exits into the air
A) slows down.
B) remains at speed c.
C) speeds up.
D) none of the above
Answer:
Which of the following compounds is an amine?
A) a
B) b
C) c
D) all of the above
E) only b and c
Answer:
Which of the following materials is most likely to undergo oxidation?
A) Na
B) Na+
C) Cl2
D) Cl–
E) both A and B
Answer:
The purpose of a voltage source is to provide an electrical
A) energy sink.
B) field.
C) pressure.
Answer:
What is one role of unpaired valance electrons?
A) They take part in the formation of different types of bonds.
B) They keep the paired electrons separated to minimize interaction.
C) They are the nonbonding electrons.
D) They provide the number of Lewis dots.
E) They tell us which Lewis dot structure is correct.
Answer:
A good tutor will be correct in saying that velocity and acceleration are
A) the same concept, but expressed differently.
B) rates of one another.
C) expressions for changing speeds.
D) different concepts.
Answer:
When a warm air mass moves into a region occupied by a cold air mass, the contact
zone is called
A) a cold front.
B) a warm front.
C) a stationary front.
D) an occluded front.
Answer:
According to the shell model, how many shells are required to describe the periodic
table?
A) one
B) seven
C) eight
D) eighteen
Answer:
A ball is thrown vertically upward. At the top of its vertical path, its velocity is
A) 0 m/s.
B) 10 m/s.
C) between 0 m/sand 10 m/s.
D) greater than 10 m/s.
E) none of the above
Answer:
The external region of the Sun that tends to be pink is the
A) photosphere.
B) chromosphere.
C) mesosphere.
D) corona.
Answer:
Water at 4C will expand when it is slightly
A) cooled.
B) warmed.
C) both of these
D) none of the above
Answer:
Planets would crash into the Sun if it weren’t for
A) their tangential velocities.
B) their vast distances from the Sun.
C) the inverse-square law.
D) their relatively small masses.
E) the fact that they are beyond the main gravitation of the Sun.
Answer:
Earth’s original atmosphere was
A) very similar to the atmosphere we have today.
B) rich in both O2 and O3.
C) obliterated after the birth of the Sun.
D) a mixture of N2, CO2, and O3.
Answer:
The main component of bleach is sodium hypochlorite, NaOCl, which consists of
sodium ions, Na , and hypochlorite ions, ⁺ What products are formed when this
compound is reacted with the hydrochloric acid, HCl, of toilet bowl cleaner?
A) The products are NaCl, , and .
B) The products are NaOH, O, and .
C) The products are NaCl and HOCl.
D) The products are NaOH, , and .
Answer:
What property of half-lives makes radioactive material so problematic?
A) There is no known way to shorten a half-life.
B) Radioactivity is limited by the natural decay-time to stable isotopes.
C) All half-lives are long.
D) There is no known way to measure half-lives with any accuracy.
E) both A and B
Answer:
Why is calcium fluoride, Ca , a high melting point crystalline solid while stannic
chloride, , is a volatile liquid?
A) There is no theory to predict the physical property of melting point. Melting point
temperatures are empirically determined.
B) Actually, we would predict these results to be the opposite. Since each metal is
combined with a group 17 halogen, the heavier metal (tin) combination should have the
higher melting point.
C) Ca is a small, linear, non-polar molecule, while is a huge tetrahedral
structure. Therefore the bonds in calcium fluoride tend to give it a higher melting point
temperature.
D) Ionic compounds formed by elements on opposite sides of the periodic table, like
, tend to have higher melting points than more covalently bonded structures, like
.
Answer:
Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average
running speed is
A) 1/2 yard/second.
B) 5 yards/second.
C) 50 yards/second.
D) not enough information
Answer:
The equivalent resistance of any parallel branch in a circuit is
A) often less than the resistance of the lowest resistor.
B) always less than the resistance of the lowest resistor.
C) usually half the value of the lowest resistor.
D) none of the above
Answer:
If Uranium-234 decays via alpha emission, what is the likely product of radioactive
decay? (U, atomic no. = 92)
A) Th
B) Np
C) Th
D) Np
E) none of the above
Answer: