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Power and Energy MCQs | Power and Energy Multiple Choice Questions(MCQs) & Answers

Questions
1 Which of the following device converts chemical energy in to electrical energy?
A Battery
B Loud Speaker
C Solar Cell
D Electric Motor

Answer: Battery
2 Joule is a unit of:
A Work
B Power
C Momentum
D None of the above

Answer: Work
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

Answer: Remains constant
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

Answer: It gains energy
5 What is the smallest unit of power?
A Watt
B Kilowatt
C Horse power
D Milliwatt

Answer: Watt
6 What is the SI unit of Work?
A Joule
B erg
C g-cm
D Watt

Answer: Joule
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

Answer: 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

Answer: 5 watt
13 Erg is related to –
A dyne-cm
B dyne/secon
C dyne-second
D dyne/cm

Answer: 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

Answer: 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

Answer: increases
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

Answer: Twice 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

Answer: Object A
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

Answer: Radiant 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

Answer: All of the above

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