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Name: ________________________ Class: ___________________ Date: __________
ID: A
Homework 4
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
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1. A positive ion is formed when
a. a neutral atom gains an electron.
b. a neutral atom loses an electron.
c. a negative ion loses an electron.
d. All of the above.
2. Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
a. right to left.
b. left to right.
c. in circles.
d. it is impossible to tell.
3. If three identical bulbs are connected in parallel across a 12V battery, the voltage across each bulb will be
a. 12V.
b. 4V.
c. 36V.
d. none of the above.
4. If three identical bulbs are connected in series across a 12V battery, the voltage across each bulb will be
a. 12V.
b. 4V.
c. 36 V.
d. none of the above.
5. A heater is rated at 1200 watts for a 120 volt source. The current in amperes drawn by the heater is
a. 0.1.
b. 10.
c. 144,000.
d. none of the above.
6. The energy used by a 100 watt light bulb in 1 hour is
a. 0.01 J.
b. 360,000 J.
c. 100 J.
d. 6,000 J.
e. none of the above.
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Name: ________________________
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7. The direction of the force on an electric charge in a magnetic field is
(A)
(B)
(C)
(D)
(E)
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ID: A
in the direction of the magnetic field.
in the direction of motion of the charge.
perpendicular to the magnetic field.
perpendicular to the direction of motion of the charge.
none of the above.
a. A
b. B
c. C and D
d. A, B, and D
e. E
8. A magnetic field will be produced at a point in space if an electric field at that point
(A) exists.
(B) gets stronger.
(C) gets weaker.
(D) changes direction.
(E) all of the above.
a. A and B
b. A and C
c. A, B, and D
d. B, C, and D
e. E
____ 9. The ozone layer
a. reflects all EM waves.
b. reflects high frequency radio waves.
c. reflects low frequency radio waves.
d. is responsible for the greenhouse effect.
e. absorbs ultraviolet light in sunlight.
____ 10. The EM wave that has the lowest frequency in this list is
a. ultraviolet.
b. infrared.
c. x rays.
d. microwave.
e. gamma rays.
____ 11. The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is
a. 32 m.
b. 3.2 m.
c. 0.32 m.
d. 0.032 m.
e. none of the above.
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ID: A
Homework 4
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
B
B
A
B
B
B
C
D
E
D
B
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