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MCQ on Work Power Energy [Objective Type Physics Quiz Set]

Objective Questions Answer on Work Power Energy

MCQ on Work Power Energy (pdf) is very important for any competitive exams specially for Railway technician, loco pilot, NDA, CDS and IAS. This is physics quiz practice set 1 provided by gkarea.com. All important questions are listed with answer.

Before practicing these mcq read General knowledge on work power and energy.

Read: Work Power Energy > Important Physics GK [PDF]

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Q.1 What is the SI unit of Work?

A: Joule
B: erg
C: g-cm
D: Watt

Answer

Joule

Q.2 1 joule = ________ erg.

A: 109
B: 105
C: 107
D: 1010

Answer

107

Q.3 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

Q.4 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.

Q.5 What is the unit of energy in SI system?

A: Joule
B: erg
C: Watt
D: Newton

Answer

Joule

Q.6 What is the unit of energy in c.g.s system?

A: dyne
B: erg
C: newton-meter/second
D: dyne-cm/second

Answer

erg

Q.7 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;

Q.8 The rate of change of work is _______ .

A: Power
B: Force
C: Momentum
D: Energy

Answer

Power

Q.9 What is the unit of power?

A: Watt
B: Newton
C: Joule
D: Newton-meter

Answer

Watt

Q.10 Potential energy = mass × ________ × height.

A: Displacement
B: Velocity
C: Density
D: Gravitational acceleration

Answer:

Gravitational acceleration.

Q.11 1 Horse Power (HP) = _________ Watt.

A: 446
B: 766
C: 746
D: 674

Answer

746 watt

Q.12 If a person walk on horizontal road with a suitcase on his hand then the work done is zero.

A: This statement is true;
B: This statement is false;

Answer

This statement is true;

Q.13 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;

Q.14 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

Q.15 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;

Q.16 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.

Q.17 Which of the following is equal with Newton-meter?

A: Joule
B: Horse Power
C: Watt
D: Pascal

Answer

Joule

Q.18 Erg is related to –

A: dyne-cm
B: dyne/secon
C: dyne-second
D: dyne/cm

Answer

dyne-cm

Q.19 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

Answer

Work done is zero

Q.20 Joule/second is related to –

A: Watt
B: Newton
C: Pascal
B: Torr

Answer

Watt

Q.21 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 totally converted to potential energy;

Q.22 What is the formula of potential energy?

A: mv2
B: mgh
C: mgh2
D: ρgh

Answer:

mgh

Q.23 What is the formula of kinetic energy?

A: (1/2)mv2
B: mv2
C: mgh
D: p∫dv

Answer

(1/2)mv2

Q.24 When a body falls from a height, its total mechanical energy remain same. The statement is –

A: True
B: False

Answer

True

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