Work MCQs : This section focuses on the "Work". These Multiple Choice Questions (MCQs) should be practiced to improve the Work skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
When can one say that work is done on the body?
A. When the body experiences force
B. When there is an increase in energy because of mechanical influence
C. When the body moves a certain distance
D. None of the above
Question 2
A block of mass 10 Kg accelerates from rest to a velocity of 20 m/s in 5s under the influence of an external force. What is the work done by the external force?
A. 2000 J
B. -2000 J
C. 20000 J
D. -20000 J
Question 3
A body of mass 40 Kg covers a distance of 50 m in 5s starting from rest under the influence of a force. What is the work done by the force on the body?
A. 8000 J
B. -8000 J
C. 20000 J
D. 800 J
Question 4
A force of 10 N creates a displacement of 2 m but the work done on the body throughout its motion is equal to 70 J. What possibly can be the reason or this?
A. There are multiple forces action on the body
B. The body is at rest
C. The force is not uniform
D. The displacement is harmonic
Question 5
A force of 40 N acts on body of mass 5 Kg which is initially at rest. What is the amount of work done in the first 10 s?
A. 16000 J
B. -16000 J
C. 400 J
D. -400 J
Question 6
A force of 40 N acts on body of mass 5 Kg. What is the amount of work done if the total displacement is 2 m and is in the direction of the force applied?
A. 80 J
B. -80 J
C. 40 J
D. 16 J
Question 7
The work done on a body of mass 5 Kg is 70 J. What is the magnitude of the force applied if the total displacement it covered is 7 m.
A. 10 N
B. -10 N
C. 20 N
D. 70 N
Question 8
Work being a scalar quantity sometimes has negative and positive signs. What does the sign suggest?
A. The direction of work
B. Relative directions of force and displacement
C. The direction of force
D. The direction of displacement
Question 9
Work done by a force on a body is an example of ______
A. Mechanical work
B. Electrical work
C. Magnetic work
D. Thermodynamic work
Question 10
Work done in a system is ___
A. The measure of energy change
B. The measure of useful work
C. The measure of displacement
D. The measure of force
Question 11
Work is a _______
A. Scalar quantity
B. Vector quantity
C. Foreign quantity
D. Magnitude less quantity
Question 12
_________ occurs when an electric current passes through an electric resistance in the circuit.
A. Mechanical work
B. Electrical work
C. Shaft work
D. Flow work
Question 13
_____________ is performed on a system when the fluid is pushed in to the system by the surrounding.
A. Mechanical work
B. Electrical work
C. Shaft work
D. Flow work
Question 14
_____________ is the form of energy that represents a transfer of energy between the system and surrounding.
A. Potential energy
B. Kinetic energy
C. Work
D. None of the mentioned
Question 15
___________ occurs when a system causes a _______ to turn against an external mechanical resistance.
A. Mechanical work, Mechanical
B. Electrical work, Electrical
C. Shaft work, Shaft
D. Flow work, Flow
Question 16
_______________ work that occurs because of a ________ force that moves the boundary of a system.
A. Mechanical, Mechanical
B. Electrical, Electrical
C. Shaft, Shaft
D. Flow, Flow
Question 17
For any irreversible process, the net entropy change is
A. Positive
B. zero
C. negative
D. infinite
Question 18
If a system generates electric current and the current is passed through a resistance outside the system. The work done is
A. Positive
B. Negative
C. Zero
D. None of the mentioned
Question 19
If electric work is done inside the system because of an applied voltage from outside the system, work done is ______________
A. Positive
B. Negative
C. Zero
D. None of the mentioned
Question 20
In an irreversible process, there is
A. gain of heat
B. loss of heat
C. no loss of heat
D. None of these
Question 21
In constant volume thermodynamic process work done is
A. Maximum
B. Minimum
C. Zero
D. None of the mentioned
Question 22
The intensive property of thermodynamics is
A. Density
B. Mass
C. Energy
D. Volume
Question 23
What is the work done for isobaric process (100 KPa)?
A. 10 KJ
B. 20 KJ
C. 30 KJ
D. 40 KJ
Question 24
What is the work done for isothermal process (200 K)?
A. -3.24 KJ
B. -6.24 KJ
C. -9.24 KJ
D. -12.24 KJ
Question 25
When a shaft in the system turns a pump to pump water out of the system, the shaft work is
A. Positive
B. Negative
C. Zero
D. None of the mentioned
Question 26
When surrounding perform a work on the system, work is
A. Positive
B. Negative
C. Zero
D. None of the mentioned
Question 27
Which one is not a type of work?
A. Mechanical work
B. Electrical work
C. Shaft work
D. All of the mentioned
Question 28
Work ______ be stored.
A. Can
B. Can not
C. always can
D. None of the mentioned
Question 29
Work is a ______________ variable.
A. Path
B. State
C. Neither Path nor State
D. None of the mentioned
Question 30
Work is negative when ________ performs a work on the ____________________
A. System, Surrounding
B. Surrounding, System
C. System, System
D. Surrounding, Surrounding