(a) the number of
neutrons.
(b) the number of
protons.
(c) the number of
neutrons plus the number of protons.
(d) the number of
electrons.
2. The atomic weight
of an element is approximately determined by
(a) the number of
neutrons.
(b) the number of
protons.
(c) the number of
neutrons plus the number of protons.
(d) the number of
electrons.
3. Suppose there is
an atom of oxygen, containing eight protons and eight neutrons in the
nucleus, and two
neutrons are added to the nucleus. What is the resulting atomic weight?
(a) 8
(b) 10
(c) 16
(d) 18
4. An ion
(a) is electrically
neutral.
(b) has positive
electric charge.
(c) has negative
electric charge.
(d) can have either a
positive or negative charge.
5. An isotope
(a) is electrically
neutral.
(b) has positive
electric charge.
(c) has negative
electric charge.
(d) can have either a
positive or negative charge.
6. A molecule
(a) can consist of a
single atom of an element.
(b) always contains
two or more elements.
(c) always has two or
more atoms.
(d) is always
electrically charged.
7. In a compound,
(a) there can be a
single atom of an element.
(b) there must always
be two or more elements.
(c) the atoms are
mixed in with each other but not joined.
(d) there is always a
shortage of electrons.
8. An electrical
insulator can be made a conductor
(a) by heating it.
(b) by cooling it.
(c) by ionizing it.
(d) by oxidizing it.
9. Of the following
substances, the worst conductor is
(a) air.
(b) copper.
(c) iron.
(d) salt water.
10. Of the following
substances, the best conductor is
(a) air.
(b) copper.
(c) iron.
(d) salt water.
11. Movement of holes
in a semiconductor
(a) is like a flow of
electrons in the same direction.
(b) is possible only
if the current is high enough.
(c) results in a
certain amount of electric current.
(d) causes the
material to stop conducting.
12. If a material has
low resistance, then
(a) it is a good
conductor.
(b) it is a poor
conductor.
(c) the current flows
mainly in the form of holes.
(d) current can flow
only in one direction.
13. A coulomb
(a) represents a
current of 1 ampere.
(b) flows through a
100-watt light bulb.
(c) is equivalent to
1 ampere per second.
(d) is an extremely
large number of charge carriers.
14. A stroke of
lightning
(a) is caused by a
movement of holes in an insulator.
(b) has a very low
current.
(c) is a discharge of
static electricity.
(d) builds up between
clouds.
15. The volt is the
standard unit of
(a) current.
(b) charge.
(c) electromotive
force.
(d) resistance.
16. If an EMF of 1
volt is placed across a resistance of 2 ohms, then the current is
(a) half an ampere.
(b) 1 ampere.
(c) 2 amperes.
(d) impossible to
determine.
is best described as
(a) an inefficient,
energy-wasting device.
(b) a motor with the
voltage connected the wrong way.
(c) an electric
generator.
(d) a magnetic field.
18. In a battery,
chemical energy can sometimes be replenished by
(a) connecting it to
a light bulb.
(b) charging it.
(c) discharging it.
(d) no means known;
when a battery is dead, you must throw it away.
19. A fluctuating
magnetic field
(a) produces an
electric current in an insulator.
(b) magnetizes the
earth.
(c) produces a
fluctuating electric field.
(d) results from a
steady electric current.
20. Visible light is
converted into electricity
(a) in a dry cell.
(b) in a wet cell.
(c) in an
incandescent bulb.
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