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

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 2

Generally a temperature scale is established by

Question # 3

In the study of thermodynamics, which gas is considered as the working substance

Question # 4

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

Question # 5

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 6

One kilogram of different substances contain

Question # 7

The only significant motion possessed by the mono-atomic gas represented is:

Question # 8

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 9

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

Question # 10

Absolute zero is considered as that temperature at which:

Question # 11

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 12

A process in which no heat enters or leaves the system is called

Question # 13

The Boltzman constant has the value

Question # 14

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

Question # 15

Which of the following is not thermo dynamical function?

Question # 16

If the volume of the gas is to be increased by 4 times, then

Question # 17

Triple point of water is

Question # 18

The relationship between Boltzmann constant k with R and NAis given as:

Question # 19

One mole of any substance contain

Question # 20

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 21

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 # 22

When heat is removed from the system

Question # 23

A process is a reversible process, if the entropy of the system

Question # 24

Pressure exerted by a gas is

Question # 25

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 26

In an ideal gas, the molecules have:

Question # 27

When heat is added into the system then change in entropy is

Question # 28

The efficiency of diesel engine is

Question # 29

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

Question # 30

The example of reversible process is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>
2 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
3 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
4 Which of the following does not have the same units:
A. Work
B. Heat
C. Kinetic energy
D. Power
5 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
6 If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy
A. 0 J
B. 2 J
C. 5 J
D. 10 J
7 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
8 When two objects come to common temperature, the body is said to be in:
A. Static equilibrium
B. Dynamic equilibrium
C. Thermal equilibrium
D. None of these
9 According to the second law, which is must to produce work
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
10 If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:
A. Force
B. Density
C. Work done
D. Pressure

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