Explore topic-wise MCQs in Engineering Physics.

This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

One end of a rod is held in a fire, while the other is held by one’s hand. Just assume his hand doesn’t get burned. After some time the rod-hand system is in thermal equilibrium. True or False?

A. True
B. False
Answer» C.
Discussion
2.

The variables like pressure, volume, temperature of a thermodynamic system are microscopic. True or False?

A. True
B. False
Answer» C.
Discussion
3.

Two bodies in thermal equilibrium can have different pressures. True or False?

A. True
B. False
Answer» B. False
Discussion
4.

We consider a thermodynamic system. If ∆U represents the increase in its internal energy and W, the work done by the system; which of the following statements are true?

A. ∆U=-W in an isothermal process
B. ∆U=W in an isothermal process
C. ∆U=-W in an adiabatic process
D. ∆U=W in an adiabatic process
Answer» D. ∆U=W in an adiabatic process
Discussion
5.

Assertion: The temperature of a gas does not change, when it undergoes an adiabatic expansion.Reason: During an adiabatic process, heat energy is exchanged between a system and its surrounding.

A. Both assertion and reason are true and the reason is the correct explanation of the assertion
B. Both assertion and reason are true but the reason is not a correct explanation of the assertion
C. Assertion is true but the reason is false
D. Both assertion and reason are false
Answer» E.
Discussion
6.

Even Carnot engine cannot give 100% efficiency, because we cannot ___________

A. Prevent radiation
B. Find ideal sources
C. Reach absolute zero temperature
D. Eliminate friction
Answer» B. Find ideal sources
Discussion
7.

Internal energy change, when a system goes from state A and B is 40 kJ mole-1. If the system goes from A and B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy?

A. 40 kJ
B. Greater than 40 kJ
C. Later than 40 kJ
D. Zero
Answer» E.
Discussion
8.

An ideal gas heat engine is operating between 227°C and 127°C. It absorbs 104 J of heat at the higher temperature. The amount of heat converted into work is?

A. 2000 J
B. 4000 J
C. 8000 J
D. 5600 J
Answer» B. 4000 J
Discussion
9.

A monoatomic ideal gas, initially at temperature T1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T2 by releasing the piston suddenly. L1 and L2 are the lengths of the gas column before and after expansion respectively, then T1/T2 is given by?

A. (L1/L2)(2/3)
B. L1/L2
C. L2/L1
D. (L2/L1)(2/3)
Answer» E.
Discussion
10.

When a gas is suddenly compressed, its temperature decreases.

A. True
B. False
Answer» C.
Discussion
11.

An ideal gas is pressed at a constant temperature. Its internal energy ___________

A. Decreases
B. Increases
C. First increases and then decreases
D. Remains the same
Answer» E.
Discussion
12.

A gas does work during isothermal expansion. The source of mechanical energy so produced is the internal energy of the gas itself.

A. True
B. False
Answer» C.
Discussion
13.

Any process in which the system returns to its initial state after undergoing a series of changes is known as ___________

A. Clockwise process
B. Anticlockwise process
C. Cyclic process
D. Thermodynamic process
Answer» D. Thermodynamic process
Discussion
14.

We_consider_a_thermodynamic_system._If_∆U_represents_the_increase_in_its_internal_energy_and_W,_the_work_done_by_the_system;_which_of_the_following_statements_are_true?$#

A. ∆U=-W in an isothermal process
B. ∆U=W in an isothermal process
C. ∆U=-W in an adiabatic process
D. ∆U=W in an adiabatic process
Answer» D. ‚Äö√Ñ√∂‚àö‚Ć‚àö√∫U=W in an adiabatic process
Discussion
15.

Even Carnot engine cannot give 100% efficiency, because we canno?

A. Prevent radiation
B. Find ideal sources
C. Reach absolute zero temperature
D. Eliminate friction
Answer» B. Find ideal sources
Discussion
16.

Internal energy change, when a system goes from state A and B is 40 kJ mole-1. If the system goes from A and B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy?

A. 40 kJ
B. Greater than 40 kJ
C. Later than 40 kJ
D. Zero
Answer» E.
Discussion
17.

An ideal gas heat engine is operating between 227°C and 127°C. It absorbs 104 J of heat at the higher temperature. The amount of heat converted into work is$

A. 2000 J
B. 4000 J
C. 8000 J
D. 5600 J
Answer» B. 4000 J
Discussion
18.

A monoatomic ideal gas, initially at temperature T1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T2 by releasing the piston suddenly. L1 and L2 are the lengths of the gas column before and after expansion respectively, then T1/T2 is given by

A. (L<sub>1</sub>/L<sub>2</sub> )<sup>(2/3)</sup>
B. L<sub>1</sub>/L<sub>2</sub>
C. L<sub>2</sub>/L<sub>1</sub>
D. (L<sub>2</sub>/L<sub>1</sub> )<sup>(2/3)</sup>
Answer» E.
Discussion
19.

When a gas is suddenly compressed, its temperature decreases.
A. True
B. False
Answer» C.
Discussion
20.

An ideal gas is pressed at a constant temperature. Its internal energy

A. Decreases
B. Increases
C. First increases and then decreases
D. Remains the same
Answer» E.
Discussion
21.

A gas does work during isothermal expansion. The source of mechanical energy so produced is the internal energy of the gas itself.
A. True
B. False
Answer» C.
Discussion
22.

Any process in which the system returns to its initial state after undergoing a series of changes is known as

A. Clockwise process
B. Anticlockwise process
C. Cyclic process
D. Thermodynamic process
Answer» D. Thermodynamic process
Discussion