Objective Questions Answer on Work Power Energy
Multiple Choice Questions on work energy and power for class 10. Some state boards this topic is in class 9.
Before practicing these mcqs read General knowledge on work power and energy.
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: Dropping 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
MCQ on Work Power Energy (pdf) for competitive exams specially for Railway technician, loco pilot, NDA, CDS and IAS. This is a physics quiz practice set 1 provided by gkarea.com. All important questions are listed with answer.