# Work-Energy Principle - Mechanical Engineering (MCQ) questions and answers

1)   A block is displaced by 3 m when a force of 200 N is applied on it on an inclined surface which is at an angle of 50o with the horizontal. What is the work done?

a. 385.67 Nm
b. 459.62 Nm
c. 933.00 Nm
d. Insufficient data
 Answer  Explanation ANSWER: 385.67 Nm Explanation: No explanation is available for this question!

2)   Which of the following is represented by the area under force-displacement diagram?

a. Impulse
b. Momentum
c. Power
d. Work done
 Answer  Explanation ANSWER: Work done Explanation: No explanation is available for this question!

3)   According to work energy principle, a particle of mass m when subjected to unbalanced force system, the work done during displacement by all forces is equal to change in ____________ during displacement.

a. gravitational energy
b. kinetic energy
c. mechanical energy
d. potential energy
 Answer  Explanation ANSWER: kinetic energy Explanation: No explanation is available for this question!

4)   The force for which work done is independent of  _______ is called as conservative force.

a. distance
b. path
c. time
d. all of the above
 Answer  Explanation ANSWER: path Explanation: No explanation is available for this question!

5)   Which of the following factors are related by work energy principle?

a. force, displacement and time
b. force, velocity, time and mass
c. force, velocity, displacement
d. displacement, time and mass
 Answer  Explanation ANSWER: force, velocity, displacement Explanation: No explanation is available for this question!

6)   What is the S.I unit of work done?

a. Joule
b. Newton meter
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Both a. and b. Explanation: No explanation is available for this question!

7)   Which of the following force(s) is a type of conservative force?

a. Frictional force
b. Gravity force
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Gravity force Explanation: No explanation is available for this question!

8)   If a particle of mass 5 kg moves uniformly along a circle of radius 10 m at 10 m/s, then what is the work done by centripetal force during its one revolution?

a. 0.5 kNm
b. zero
c. infinity
d. none of the above
 Answer  Explanation ANSWER: zero Explanation: No explanation is available for this question!

9)   Work done by an engine in 6 sec is 1000 joules. What is the power generated by the engine in watt?

a. 1600 watt
b. 600 watt
c. 166 watt
d. 600 watt
 Answer  Explanation ANSWER: 166 watt Explanation: No explanation is available for this question!

10)   According to the principle of conservation of energy, under the action of _________ force, the sum of P.E and K.E of a particle remains constant.

a. conservative force
b. dissipative force
c. frictional force
d. air resistance force
 Answer  Explanation ANSWER: conservative force Explanation: No explanation is available for this question!