MERIT YARD

Class 11th Physics - Thermodynamics - MERIT YARD

Question 1 / 40Which law of thermodynamics introduces the concept of temperature?

A) Zeroth Law

B) First Law

C) Second Law

D) Third Law

Question 2 / 40The first law of thermodynamics is a restatement of the law of conservation of:

A) Mass

B) Momentum

C) Energy

D) Charge

Question 3 / 40In an isothermal process, which of the following remains constant?

A) Pressure

B) Volume

C) Temperature

D) Heat

Question 4 / 40In which process is there no exchange of heat between the system and surroundings?

A) Isothermal

B) Adiabatic

C) Isobaric

D) Isochoric

Question 5 / 40The internal energy of an ideal gas depends only on its:

A) Pressure

B) Volume

C) Temperature

D) Size

Question 6 / 40Mayer's relation between molar specific heats C_p and C_v is:

A) C_p + C_v = R

B) C_p - C_v = R

C) C_v - C_p = R

D) C_p / C_v = R

Question 7 / 40A system absorbs 500 J of heat and does 200 J of work. The change in internal energy is:

A) 700 J

B) 300 J

C) 200 J

D) 500 J

Question 8 / 40The efficiency of a Carnot engine depends on:

A) Nature of working substance

B) Temperature of source and sink

C) Size of the engine

D) Volume of the cylinder

Question 9 / 40For an adiabatic process, the relation between P and V is:

A) PV = constant

B) PV^γ = constant

C) P/V = constant

D) V/T = constant

Question 10 / 40A heat engine works between 300 K and 600 K. Its maximum efficiency is:

A) 100%

B) 75%

C) 50%

D) 25%

Question 11 / 40Which of the following is a state variable?

A) Heat

B) Work

C) Internal Energy

D) Distance

Question 12 / 40In an isochoric process, which quantity is zero?

A) Work done

B) Heat absorbed

C) Internal energy

D) Pressure change

Question 13 / 40The slope of an adiabatic curve is _______ than the slope of an isothermal curve.

A) Less

B) More

C) Equal

D) Zero

Question 14 / 40During an adiabatic compression, the temperature of the gas:

A) Increases

B) Decreases

C) Remains same

D) Becomes zero

Question 15 / 40The refrigerator is basically a heat engine working in:

A) Forward direction

B) Reverse direction

C) Parallel direction

D) Circular direction

Question 16 / 40Which law states that heat cannot flow from a colder body to a hotter body on its own?

A) Zeroth Law

B) First Law

C) Second Law

D) Newton's Law

Question 17 / 40The value of γ (C_p/C_v) for a monatomic gas is:

A) 1.40

B) 1.67

C) 1.33

D) 1.00

Question 18 / 40Work done in an isobaric process is given by:

A) P(V₂ - V₁)

B) V(P₂ - P₁)

C) Zero

D) nRT log(V₂/V₁)

Question 19 / 40In a cyclic process, the change in internal energy is:

A) Positive

B) Negative

C) Zero

D) Infinite

Question 20 / 40Carnot cycle consists of:

A) 2 Isothermal processes

B) 2 Adiabatic processes

C) 1 Isothermal and 1 Adiabatic

D) 2 Isothermal and 2 Adiabatic processes

Question 21 / 40The area under a P-V diagram represents:

A) Pressure

B) Temperature

C) Work done

D) Internal energy

Question 22 / 40Which of the following is an intensive property?

A) Volume

B) Mass

C) Temperature

D) Total Energy

Question 23 / 40Kelvin-Planck statement is related to:

A) Refrigerator

B) Heat Engine

C) Heat Conduction

D) Zeroth Law

Question 24 / 40A sample of gas expands from 1 L to 4 L at a constant pressure of 10⁵ Pa. Work done is:

A) 100 J

B) 300 J

C) 400 J

D) 500 J

Question 25 / 40The coefficient of performance (COP) is used for:

A) Heat Engine

B) Refrigerator / Heat Pump

C) Electric Motor

D) Steam Boiler

Question 26 / 40For an ideal gas, the work done in a free expansion is:

A) Positive

B) Negative

C) Zero

D) Infinite

Question 27 / 40Clausius statement of second law is related to:

A) Transfer of heat from cold to hot body

B) Conversion of work to heat

C) Efficiency of heat engines

D) Conservation of mass

Question 28 / 40At absolute zero temperature, the entropy of a perfect crystal is:

A) Maximum

B) Zero

C) Minimum but not zero

D) Infinite

Question 29 / 40Which process is very slow?

A) Isothermal

B) Adiabatic

C) Isobaric

D) Explosion

Question 30 / 40If γ = 1.4, the gas is likely to be:

A) Monatomic

B) Diatomic

C) Triatomic

D) Noble gas

Question 31 / 40Heat given to a system in an isochoric process is used to:

A) Increase internal energy

B) Do external work

C) Decrease temperature

D) Melt the system

Question 32 / 40An ideal heat engine cannot have 100% efficiency because of:

A) Friction

B) Poor design

C) Second Law of Thermodynamics

D) First Law of Thermodynamics

Question 33 / 40Work done by the system is taken as:

A) Positive

B) Negative

C) Zero

D) Vector quantity

Question 34 / 40Compressed air coming out of a punctured tyre becomes cool due to:

A) Isothermal expansion

B) Adiabatic expansion

C) Isobaric cooling

D) Convection

Question 35 / 40Specific heat of a gas in an adiabatic process is:

A) Zero

B) Infinite

C) Constant

D) R

Question 36 / 40Specific heat of a gas in an isothermal process is:

A) Zero

B) Infinite

C) R

D) Negative

Question 37 / 40The PV diagram for an isochoric process is a:

A) Horizontal line

B) Vertical line

C) Curve

D) Circle

Question 38 / 40Internal energy of a real gas depends on:

A) Only Temperature

B) Temperature and Volume

C) Only Pressure

D) Shape of container

Question 39 / 40Carnot engine is:

A) Irreversible

B) Reversible

C) 100% efficient

D) External combustion only

Question 40 / 40Adiabatic curve slope is equal to _______ times isothermal curve slope.

A) 1

B) γ

C) 1/γ

D) zero

🚀 Join Merit Yard for JAC 2026 Board Success! 🚀