ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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Question # 1

Average KE of a gas molecule has:

Question # 2

Internal energy is the sum of all the forms of

Question # 3

The motion of molecules in gases is:

Question # 4

The product of the pressure and volume of an ideal gas is

Question # 5

Which of the following does not have the same units:

Question # 6

The ideal gas law is

Question # 7

The percentage of available heat energy converted into work by a diesel engine is roughly

Question # 8

Efficiency of carnot engine is independent of the

Question # 9

Pressure exerted by a gas is

Question # 10

Electromagnetic waves emitted by hot bodies are called:

Question # 11

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 12

While deriving the equation for pressure of a gas we consider the

Question # 13

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

Question # 14

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 15

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 16

The internal energy of a system does not depend upon the

Question # 17

Hotness and coldness of an object is represented in terms:

Question # 18

On colliding in a closed container, the gas molecules

Question # 19

Sadi carnot described an ideal heat engine in

Question # 20

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Question # 21

In an ideal gas, the molecules have:

Question # 22

In thermodynamics, internal energy is the function of

Question # 23

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 24

The behaviour of gases is well accounted by the kinetic theory based on

Question # 25

The number of translation degress of freedom for a diatomic gas is

Question # 26

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 27

The example of reversible process is

Question # 28

The temperature scale approved in SI units is:

Question # 29

The internal energy of an ideal gas system is generally the

Question # 30

The basis to define a temperature scale that is independent of material properties is provided by

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
2 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
3
During the whole carnot cycle
A. Thermal equilibrium is maintained
B. mechanical equilibrium is maintained
C. both the thermal and mechanical equilibriumis maintained
D. both the thermal and mechanical equilibrium is not maintained
4 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
5 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
6 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
7 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
8 Pressure of a gas at constant volume is proportion to
A. Total energy of gas
B. Average P.E to molecules
C. Average K.E of molecules
D. Total internal energy of gas
9 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
10 The second law of thermodynamics is concerned with the circumstances in which
A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them

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