1.
What is 1 horsepower approximately equal to?
A
736 W
B
1000 W
C
746 W
D
10 W
View Answer
Correct Answer: C — 746 W
Explanation:
One horsepower is approximately equal to 746 watts.
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5 practice sets · Page 1 of 1
What is 1 horsepower approximately equal to?
736 W
1000 W
746 W
10 W
Correct Answer: C — 746 W
Explanation:
One horsepower is approximately equal to 746 watts.
Which of the following is a high-power appliance?
Mobile phone charger
LED bulb
Refrigerator
Electric iron
Correct Answer: D — Electric iron
Explanation:
Electric irons consume a large amount of electrical power.
Which of the following is true about power?
It is the energy stored in an object
It is measured in newtons
It is the rate at which energy is used
It is inversely proportional to time
Correct Answer: C — It is the rate at which energy is used
Explanation:
Power is the rate at which work is done or energy is used.
What is the power required to do 100 J of work in 5 seconds?
200 W
50 W
10 W
20 W
Correct Answer: D — 20 W
Explanation:
Power = Work ÷ Time = 100 ÷ 5 = 20 W.
What is the power consumed by a 60-watt bulb in 2 hours?
120 Wh
60 Wh
120 W
720 W
Correct Answer: A — 120 Wh
Explanation:
Energy consumed = Power × Time = 60 W × 2 h = 120 Wh.