Question

Question 11 (5 points)

Which of the following does not serve as a way to neutralize the charge in a body?
Question 11 options:


A)
Adding free electrons to a positively charged body


B)
Allowing free electrons to escape from a negatively charged body


C)
Adding more protons to a positively charged body until the number of protons matches the number of electrons


D)
Bringing the charged body into contact with another body having an equal but opposite charge
Question 12 (5 points)

When a device is used in a circuit in which the voltage is 81 V, the current flowing through the device is 3 A. What's the resistance of the device?
Question 12 options:


A)
27 Ω


B)
243 Ω


C)
243 A


D)
40.5 A
Question 13 (5 points)

A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary?
Question 13 options:


A)
690


B)
1,653


C)
72


D)
8
Question 14 (5 points)

Which of the following is true of semiconductors?
Question 14 options:


A)
Exposing a crystal of a semiconductor to heat or light starts displacing valence electrons, which then move throughout the crystal.


B)
Neither free electrons nor holes are considered charge carriers in a semiconductor.


C)
Gold and silver are important semiconductors.


D)
A material is classified as a semiconductor if its resistance to the flow of electric current is too low to permit it to be called a conductor.
Question 15 (5 points)

Which of the following pairs of items will be attracted by one another?
Question 15 options:


A)
A positively charged pith ball and a negatively charged glass rod


B)
A negatively charged pith ball and a negatively charged glass rod


C)
Two positively charged pith balls


D)
Two negatively charged pith balls
Question 16 (5 points)

Which of the following devices is associated with the reception of radio signals?
Question 16 options:


A)
Transmitting antenna


B)
Oscillator


C)
Microphone


D)
Demodulator
Question 17 (5 points)

Suppose that an electric charge is produced on one part of a body. If the charge spreads through the entire body, the body is most likely made of
Question 17 options:


A)
plastic.


B)
porcelain.


C)
metal.


D)
oil.
Question 18 (5 points)

How much heat energy is produced by 0.5 Wh of electrical energy?
Question 18 options:


A)
2.6 Btu


B)
0.15 Btu


C)
0.4 Btu


D)
1.7 Btu
Question 19 (5 points)

A series circuit contains two devices, one with a resistance of 10 ohms and one with a resistance of 4 ohms. If the generator supplies a voltage of 42 V, what's the magnitude of the current?
Question 19 options:


A)
1.33 A


B)
3 A


C)
1.75 A


D)
2 A
Question 20 (5 points)

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the
Question 20 options:


A)
deflecting plate.


B)
cathode.


C)
anode.


D)
grid.

Answer 1

11: C
12: A
13: C
14: A
15: A
16: D
17: C
18: D
19: B
20: D