Electrical Energy and Power NEET Questions

Physics - Current Electricity

Electrical Energy and Power MCQ Questions


1.
What is the power consumed by a device with 5A current and 220V potential difference?
A.
500W
B.
440W
C.
2200W
D.
1100W
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ANSWER :
D. 1100W
2.
Which physical quantity is measured in kilowatt-hours?
A.
Current
B.
Power
C.
Voltage
D.
Energy
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ANSWER :
D. Energy
3.
A device operates at 60W power for 30 minutes. How much energy is used?
A.
0.3 kWh
B.
3 kWh
C.
30 kWh
D.
0.03 kWh
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ANSWER :
D. 0.03 kWh
4.
How is the efficiency of an electrical device expressed?
A.
Ampere
B.
Watt
C.
Joule
D.
Percentage
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ANSWER :
D. Percentage
5.
Which of the following devices has the highest power consumption?
A.
Mobile charger
B.
LED light
C.
Fan
D.
Electric heater
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ANSWER :
D. Electric heater
6.
If the resistance of a device is halved, keeping voltage constant, the power will:
A.
Halve
B.
Double
C.
Remain the same
D.
Become zero
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ANSWER :
B. Double