1 : For an ideal gas, the potential energy associated with its molecules is:
1 : Maximum
2 : Zero
3 : 1/2Kx
4 : 1/2kx₀
2 : Ideal gas law is:
1 : PV = 3RT
2 : P = NkT
3 : PV = nRT
4 : None
3 : Heat is a form of:
1 : Power
2 : Momentum
3 : Torque
4 : Energy
4 : Boltzmann constant k is equal to:
1 : N_A / R
2 : R / N_A
3 : R / N_0
4 : N_0 / R
5 : At constant temperature, if pressure is halved then its volume is:
1 : Constant
2 : Halved
3 : Four times
4 : Double
6 : According to kinetic theory of gases, the size of molecule is _____ the separation between them:
1 : Much smaller than
2 : Smaller than
3 : Larger than
4 : Much larger than
7 : Boltzmann constant 'k' has same unit as:
1 : Temperature
2 : Energy
3 : Entropy
4 : Pressure
8 : What remains constant in adiabatic process?
1 : Volume
2 : Pressure
3 : Heat
4 : Temperature
9 : In case of adiabatic process, 1st law of thermodynamics is written as:
1 : W = ΔU
2 : W = Q
3 : W = -ΔU
4 : W = 0
10 : According to 1st law of thermodynamics, the quantity which is conserved is:
1 : Energy
2 : Force
3 : Momentum
4 : Power
11 : Boyle's law is applicable to:
1 : Isobaric process
2 : Isochoric process
3 : Isothermal process
4 : Adiabatic process
12 : Which is called the internal energy of an ideal gas?
1 : Potential energy
2 : Translational kinetic energy
3 : Vibrational kinetic energy
4 : All of these
13 : At which of the following temperature does a body have maximum internal energy?
1 : -270°C
2 : 0 K
3 : 273 K
4 : -273 K
14 : The work done in isochoric process is:
1 : Constant
2 : Variable
3 : Zero
4 : Depend on condition
15 : The change in internal energy is defined as:
1 : Q - W
2 : Q - T
3 : Q - P
4 : Q / P
16 : If P = Pressure, V = Volume of a gas, then PΔV represents:
1 : Work
2 : Density
3 : Power
4 : Temperature
17 : The SI unit of product of pressure and volume is:
1 : Watt
2 : Joule
3 : Pascal
4 : N·m
18 : If internal energy decreases by 300 J and 120 J of work is done on the system, then heat will be:
1 : 420 J
2 : 320 J
3 : 400 J
4 : 180 J
19 : Average kinetic energy of molecules of a gas gives:
1 : Heat energy
2 : Work done
3 : Internal energy
4 : Entropy
20 : The product of SI unit of pressure and volume is:
1 : Watt
2 : Joule
3 : Pascal
4 : Kelvin
21 : The relation W = -ΔU represents the process:
1 : Isothermal expansion
2 : Adiabatic expansion
3 : Isothermal compression
4 : Adiabatic compression
22 : The efficiency of Carnot engine depends upon:
1 : Sink temperature
2 : Source temperature
3 : Both source and sink temperature
4 : The working substance
23 : For working of a heat engine, there must be:
1 : Source
2 : Sink
3 : Either of these
4 : Both of them
24 : What would be the efficiency of a Carnot engine operating with boiling water as one reservoir and a freezing mixture of ice and water as the other reservoir?
1 : 100%
2 : 27%
3 : 67%
4 : 12%
25 : Efficiency of a heat engine working between temperature 27°C and 327°C will be:
1 : 50%
2 : 90%
3 : 40%
4 : 61%
26 : A Carnot engine has an efficiency of 50% when its sink temperature is 27°C. The temperature of source is:
1 : 300°C
2 : 327°C
3 : 373°C
4 : 273°C
27 : Carnot engine cycle consists of:
1 : Four steps
2 : Three steps
3 : Single step
4 : Two steps
28 : If the temperature of sink is absolute zero then the efficiency of heat engine should be:
1 : 100%
2 : 50%
3 : Zero
4 : Infinite
29 : No entropy change takes place in an:
1 : Isobaric process
2 : Isothermal process
3 : Adiabatic process
4 : Isochoric process
30 : The latent heat of fusion of ice is:
1 : 3.36 × 10⁵ J kg⁻¹
2 : 3.36 × 10 J kg⁻¹
3 : 3.36 × 10⁷ J kg⁻¹
4 : 3.36 × 10 J·kg⁻¹
31 : When two objects are made in thermal contact having same temperature, then they are at:
1 : thermal Equilibrium
2 : chemical Equilibrium
3 : physical Equilibrium
4 : mechanical Equilibrium
32 : If heat added to a system, then its entropy will:
1 : Increase and positive
2 : Decrease and positive
3 : Increase but negative
4 : Decrease but negative
33 : No entropy change take place in:
1 : Isothermal process
2 : Adiabatic process
3 : Isobaric process
4 : Isochoric process
34 : In an isothermal change, internal energy:
1 : decreases
2 : increases
3 : remains the same
4 : becomes zero
35 : The Carnot cycle can be shown by a graph between:
1 : V - T graph
2 : P - T graph
3 : Q - T graph
4 : P - V graph
36 : First law of thermodynamics is based upon law of conservation of:
1 : mass
2 : energy
3 : momentum
4 : charge
37 : When the system is expanded by adding heat energy, then the work done will be:
1 : positive and on the system
2 : negative and on the system
3 : positive and by the system
4 : negative and by the system
38 : In Carnot engine each process is:
1 : Reversible
2 : Perfectly reversible
3 : Irreversible
4 : Perfectly irreversible
39 : When hot and cold water are mixed, the entropy:
1 : Decreases
2 : Increases
3 : Remains constant
4 : Zero
40 : In which process entropy of the system remains constant?
1 : Isothermal
2 : Isochoric
3 : Irreversible
4 : Adiabatic
41 : Change in entropy of a system in reversible process:
1 : decreases
2 : increases
3 : is Infinite
4 : is zero
42 : Net change in entropy of a system after one complete Carnot cycle is:
1 : Positive
2 : Negative
3 : Zero
4 : Sometimes positive and sometimes negative
43 : The value of Boltzmann constant is:
1 : 1.38 × 10⁻²³ J/K
2 : 1.38 × 10⁻³ J/K
3 : 1.38 × 10 J/K
4 : 1.38 × 10² J/K
44 : If the temperature of the sink is decreased, the efficiency of Carnot engine:
1 : Decrease
2 : Increase
3 : Remains the same
4 : First increases then decreases
45 : Thermodynamics mostly deals with:
1 : measurement of quantity of heat
2 : transfer of quantity of heat
3 : change of state
4 : Conversion of heat to other forms of energy
46 : Heat engine is a device which converts:
1 : Heat energy into chemical energy
2 : Heat energy into mechanical work
3 : Heat energy into electrical energy
4 : Heat energy into potential energy
47 : What happens to internal energy of an object when its temperature increase?
