🔥 Thermodynamics – Mixed Mock Test (JEE Level)

Instructions: Each question has one correct option unless stated.

Q1.

Which of the following is a path function?

A) Temperature
B) Internal Energy
C) Entropy
D) Work

Q2.

For a cyclic process, which statement is always true?

A) Q = 0
B) W = 0
C) ΔU = 0
D) ΔS = 0

Q3.

An ideal gas undergoes an isothermal expansion. Which is correct?

A) ΔU > 0
B) ΔU < 0
C) ΔU = Q
D) ΔU = 0

Q4.

In an adiabatic process:

A) Q = 0
B) W = 0
C) ΔT = 0
D) ΔS = 0 always

Q5.

The internal energy of an ideal gas depends on:

A) Pressure only
B) Volume only
C) Temperature only
D) Pressure & volume

Q6.

Which law introduces the concept of temperature?

A) First law
B) Zeroth law
C) Second law
D) Third law

Q7.

In an isochoric process:

A) W = 0
B) Q = 0
C) ΔU = 0
D) PV = constant

Q8.

The efficiency of a Carnot engine depends on:

A) Working substance
B) Engine design
C) Temperatures only
D) Pressure ratio

Q9.

Which statement violates the second law?

A) Heat flows from hot to cold naturally
B) 100% conversion of heat to work in a cycle
C) Refrigerator needs work
D) Entropy of universe increases

Q10.

Entropy is a measure of:

A) Energy
B) Disorder
C) Temperature
D) Pressure

Q11.

For a reversible process, entropy change of universe is:

A) Positive
B) Negative
C) Zero
D) Maximum

Q12.

Which process has maximum work output?

A) Irreversible expansion
B) Sudden expansion
C) Free expansion
D) Reversible expansion

Q13.

Which quantity is conserved in all thermodynamic processes?

A) Heat
B) Work
C) Internal energy + work + heat
D) Energy

Q14.

For an isolated system:

A) ΔU = 0 always
B) ΔS ≥ 0
C) Q ≠ 0
D) W ≠ 0

Q15.

Which is NOT a state variable?

A) Pressure
B) Volume
C) Work
D) Temperature

Q16.

The slope of PV curve for an isothermal process is:

A) Positive
B) Zero
C) Negative
D) Infinite

Q17.

Efficiency of a real engine is always:

A) Equal to Carnot
B) Greater than Carnot
C) Less than Carnot
D) Independent of Carnot

Q18.

Entropy change in free expansion of ideal gas is:

A) Zero
B) Negative
C) Positive
D) Undefined

Q19.

Which condition ensures reversibility?

A) Rapid process
B) Friction present
C) Quasi-static + no dissipation
D) Large temperature difference

Q20.

The first law of thermodynamics is a statement of:

A) Entropy increase
B) Energy conservation
C) Heat flow direction
D) Absolute zero

✅ ANSWER KEY

1) D
2) C
3) D
4) A
5) C
6) B
7) A
8) C
9) B
10) B
11) C
12) D
13) D
14) B
15) C
16) C
17) C
18) C
19) C
20) B

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🔥 Thermodynamics – Objective Final Revision

Thermodynamics – Set 1
Set 2
Set 3
Set 4
Set 5
Set 6
Set 7
Set 8
Set 9
Set 10
Set 11
Set 12
Set 13
Set 14
Set 15
Set 16
Set 17
Set 18
Set 19
Set 20
Set 21
Set 22
Set 23
Set 24
Set 25
Set 26
Set 27
Set 28
Set 29
Set 30
Set 31
Set 32
Set 33
Set 34
Set 35
Set 36
Set 37
Set 38
Set 39
Set 40
Set 41
Set 42
Set 43
Set 44
Set 45
Set 46
Set 47
Set 48
Set 49
Set 50
Set 51
Set 52
Set 53
Set 54
Set 55
Set 56
Set 57
Set 59

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