Ch17-PreAssessment

Chapter 17

Pre-Assessment

Multiple Choice.

Choose the one alternative that best completes the statement or answers the question.

1) Is it possible for two negative charges to attract each other?
A) Yes, they will attract if they are close enough.
B) Yes, they will attract if one carries a larger charge than the other.
C) Yes, they will always attract.
D) No, they will never attract.

2) Is it possible for a positive and a negative charge to attract each other?
A) Yes, they will attract if one carries a larger charge than the other.
B) Yes, they always attract.
C) No, they will never attract.
D) Yes, they will attract if they are close enough.

3) A proton carries a
A) neutral charge.
B) negative charge.
C) positive charge.
D) variable charge.

4) The model of the atom shows a
A) nucleus consisting of both electrons and neutrons, surrounded by a cloud of protons.
B) nucleus consisting of both protons and electrons, surrounded by a cloud of neutrons.
C) nucleus consisting of both protons and neutrons, surrounded by a cloud of electrons.
D) neutrally charged nucleus surrounded by both protons and electrons.

5) A neutral atom always has
A) the same number of neutrons as protons.
B) the same number of protons as electrons.
C) more neutrons than protons.
D) more protons than electrons.

6) An atom has more electrons than protons. The atom is
A) a negative ion.
B) a superconductor.
C) impossible.
D) a positive ion.

7) Materials in which the electrons are bound very tightly to the nuclei are referred to as
A) insulators.
B) superconductors.

C) semiconductors.
D) conductors.

8) Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as
A) conductors.
B) semiconductors.
C) insulators.
D) superconductors.

9) The charge carried by one electron is e= -1.6 x 10 C. The number of electrons necessary to produce a charge of -1.0C is
A) 1.6 x 10
B) 6.25 x 10
C) 6.25 x 10
D) none of the given answers.

10) A piece of plastic has a net charge of +2.00 m C. How many more protons than electrons does this piece of plastic have?
A) 1.25 x 10
B) 2.50 x 10
C) 2.5 x 10
D) 1.25 x 10

11) What is the charge on 1 kg of protons?
A) 1.0 C
B) 6.0 x 10 C
C) 9.6 x 10 C
D) 1000 C

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(Solutions)