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Free download in PDF Power and Energy Multiple Choice 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.
(1)
Which of the following device converts chemical energy in to electrical energy?
[A]
Battery
[B]
Loud Speaker
[C]
Solar Cell
[D]
Electric Motor
(2)
Joule is a unit of:
[A]
Work
[B]
Power
[C]
Momentum
[D]
None of the above
(3)
When an object falls freely towards the ground, then its total energy:
[A]
Increases
[B]
Decreases
[C]
Remains constant
[D]
First increases then decreases
(4)
What happens to the body on which work is done:
[A]
It loses energy
[B]
It gains energy
[C]
No change in the energy
[D]
First it loses then it gain
(5)
What is the smallest unit of power?
[A]
Watt
[B]
Kilowatt
[C]
Horse power
[D]
Milliwatt
(6)
What is the SI unit of Work?
[A]
Joule
[B]
erg
[C]
g-cm
[D]
Watt
(7)
Which of the followings is an example of work done against force?
[A]
Getting up with the stairs
[B]
Get down with the stairs
[C]
Walking on the flat ground
[D]
Droping any object down from the top
Answer: Getting up with the stairs
(8)
What is energy?
[A]
energy is the rate of change of work done;
[B]
It is the ability to do work;
[C]
Both A and B;
[D]
none of the above
Answer: It is the ability to do work;
(9)
Potential energy = mass × ________ × height.
[A]
Displacement
[B]
Velocity
[C]
Density
[D]
Gravitational acceleration
Answer: Gravitational acceleration
(10)
What is the formula of work done?
[A]
Work done = force × displacement;
[B]
Work done = force × velocity;
[C]
Work done = pressure × displacement
[D]
Work done = mass × acceleration;
Answer: work done = force × displacement;
(11)
An object of mass 200 g moving with velocity 50 cm/s. What is its kinetic energy?
[A]
2.1 × 105 erg
[B]
2.0 × 105 erg
[C]
2.8 × 105 erg
[D]
2.5 × 105 erg
(12)
A machine do a work of 100 joule in 20 second. What is its power?
[A]
120 watt
[B]
80 watt
[C]
5 watt
[D]
2000 watt
(13)
Erg is related to –
[A]
dyne-cm
[B]
dyne/secon
[C]
dyne-second
[D]
dyne/cm
(14)
A particle is thrown upward with some kinetic energy. What happened to its kinetic energy at the highest point or height it reaches.
[A]
Its kinetic energy is lost
[B]
It’s all kinetic energy is absorbed by the air
[C]
Its kinetic energy is converted to potential energy
[D]
Its kinetic energy is remain same
Answer: Its kinetic energy is converted to potential energy
(15)
A joule (J) is used as a unit of measurement for :
[A]
Kinetic Energy
[B]
Potential Energy
[C]
Work done
[D]
All of the above
(16)
When a spring is compressed or stretched beyond its natural position by applying some force, work is done on it. Its elastic potential energy
[A]
increases
[B]
Decreases
[C]
Disappears
[D]
Does not change
(17)
A car which is 8 times heavier than a motorcycle is moving at a speed which is just 1/2 the speed of motorcycle. . The amount of work done required to stop the car as compare to that of motorcycle, will be ?
[A]
The same amount
[B]
Twice as much
[C]
Three times as much
[D]
Four times as much
(18)
Two objects A and B are moving with same momentum. Mass of object 'B' is greater then mass of object 'A'. Which of the two object will have higher kinetic energy?
[A]
Object A
[B]
Object B
[C]
Both the objects will have same Kinetic Energy
[D]
Object with greater mass will have higher kinetic energy
(19)
Our planet Earth receives or transfers most of its energy in the form of :
[A]
Radiant energy
[B]
Geo-thermal energy
[C]
Chemical energy
[D]
Wind energy
(20)
Power of an agent is
[A]
the rate of generation of energy
[B]
the rate of transfer of energy
[C]
the rate of consumption of energy
[D]
All of the above
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