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Senior High School: 11th and 12th Grade
Physics
Electricity - Household Electricity
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Q.1
What is DC electricity?
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An electrical source supplying current passing in the same direction
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An electrical source supplying current passing in a constantly changing direction
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An electrical source supplying no current
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An electrical source supplying current passing in the opposite direction to voltage
Q.2
What is AC electricity?
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An electrical source supplying current passing in the same direction
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An electrical source supplying current passing in a constantly changing direction
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An electrical source supplying no current
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An electrical source supplying current passing in the opposite direction to voltage
Q.3
Most electrical devices connect to the mains supply using what connector?
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3-Pin plug
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1-Pin plug
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4-Pin Plug
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5-Pin Plug
Q.4
In a plug there are three wires. What color is the earth wire?
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Blue
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Green
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Green and yellow
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Brown
Q.5
Why are cables insulated with plastic sheaths?
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For esthetic value
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To protect from electric shock
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To improve the conductivity of the wires
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There is no reason for the cable to be covered
Q.6
Why do plugs contain fuses?
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To protect the device from damage
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To protect from electric shock
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Fuses are not used in electrical devices
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To protect the device from damage and to protect from electric shock
Q.7
Appliances with metal casing are usually what?
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Earthed
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Unearthed
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More expensive than a house
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Live
Q.8
What type of current does a cell or a battery produce?
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DC
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AC
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No current
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Positive current and negative voltage
Q.9
What is the correct formula for calculating the frequency of a supply?
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f = 1⁄T
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f = 1⁄2T
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f = 2⁄T
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f = 3⁄T
Q.10
What is the frequency of a supply which has a time period of 100 seconds
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10 Hz
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1 Hz
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0.1 Hz
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0.01 Hz
0 h : 0 m : 1 s
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