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Free download in PDF Power and Energy Objective Type Questions & Answers for competitive exams. These objective type questions are very important for competitive exams like IIT-JEE, NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
(21)
On an object the work done does not depend upon:
[A]
Displacement
[B]
Angle between force and displacement
[C]
Force applied
[D]
Initial velocity of an object
Answer: Initial velocity of an object
(22)
A radio set of 60 watts runs for 50 hours. How many units of electrical energy are consumed in kWh?
[A]
2 kWh
[B]
3 kWh
[C]
4 kWh
[D]
2.5 kWh
(23)
In 1 minute how much energy does a 100 W electric bulb transfers?
[A]
100 J
[B]
600 J
[C]
3600 J
[D]
6000 J
(24)
The commercial unit of Energy is:
[A]
Watt
[B]
Watt-hour
[C]
Kilowatt-hour
[D]
Kilowatt
(25)
The energy possessed by a body due to its position is called:
[A]
Kinetic Energy
[B]
Potential Energy
[C]
Mechanical Energy
[D]
Electrical Energy
(26)
What happens to its potential energy when an object is taken to high altitude?
[A]
Its potential energy increases
[B]
Its potential energy decreases
[C]
Its potential energy remain same
[D]
None of the above
Answer: Its potential energy increases
(27)
What is the unit of energy in SI system?
[A]
Joule
[B]
erg
[C]
Watt
[D]
Newton
(28)
What is the unit of energy in c.g.s system?
[A]
dyne
[B]
erg
[C]
newton-meter/second
[D]
dyne-cm/second
(29)
The rate of change of work is _______ .
[A]
Power
[B]
Force
[C]
Momentum
[D]
Energy
(30)
What is the unit of power?
[A]
Watt
[B]
Newton
[C]
Joule
[D]
Newton-meter
31
1 Horse Power (HP) = _________ Watt.
[A]
446
[B]
766
[C]
746
[D]
674
32
Which of the following is true?
[A]
Power = work done × time
[B]
Power = work done/time
[C]
Power = work done × velocity
[D]
Power = work done/ velocity
Answer: Power = work done/time
33
Which of the following is equal with Newton-meter?
[A]
Joule
[B]
Horse Power
[C]
Watt
[D]
Pascal
34
Due to application of 5 N force an object moves 10 meter along perpendicular direction of the force. What amount work is done?
[A]
50 Joule
[B]
15 Joule
[C]
5 Joule
[D]
0 Joule
35
Joule/second is related to –
[A]
Watt
[B]
Newton
[C]
Pascal
[D]
Torr
36
What is the formula of potential energy?
[A]
mv2
[B]
mgh
[C]
mgh2
[D]
ρgh
37
What is the formula of kinetic energy?
[A]
(1/2)mv2
[B]
mv2
[C]
mgh
[D]
p∫dv
38
A dog weighing 25 kg, while chasing a cat, jumps over a fence of height 1.6 m. What is the potential energy of dog at the top of fence ?
[A]
160 Joules
[B]
320 Joules
[C]
380 Joules
[D]
480 Joules
39
A soldier makes a swing jump between two points, by holding one end of a rope, other end of which is tied to some higher point. Work done by rope in jumping of soldier from one point to another is an example of :
[A]
Negative work
[B]
Positive work
[C]
Zero work done
[D]
None of the above
40
The value of 1 Kilo Watt Hour is
[A]
1.8 X 105J
[B]
3.6 X 106J
[C]
5.4 X 108J
[D]
7.2 X 1010J
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