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

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 # 2

In an adiabatic expansion, the temperature of the gas

Question # 3

The second law of thermodynamics is concerned with the circumstances in which

Question # 4

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 5

Melting point of ice

Question # 6

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

Question # 7

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 8

First law of thermodynamic is special case of

Question # 9

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

Question # 10

During the whole carnot cycle

Question # 11

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 12

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

Question # 13

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 14

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 15

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

Question # 16

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 17

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

Question # 18

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

Question # 19

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 20

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

Question # 21

In the formula P = N0KT, N0denotes:

Question # 22

The example of irreversible process is

Question # 23

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 24

No spark plug is needed in

Question # 25

If the formula PV = nRT, n denotes:

Question # 26

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

Question # 27

Which of the following is not thermo dynamical function?

Question # 28

Heat travels through vacuum by

Question # 29

The absolute temperature of the tripple point of water is

Question # 30

Electromagnetic waves emitted by hot bodies are called:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
2 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
3 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
4 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids
5 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these
6 Brownian motion increases due to
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium
7 Amount of heat required to raise the temperature of a body through 1 K is called its
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
8 Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure
A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B
9 Efficiency of carnot engine is independent of the
A. temperature of sink
B. temperature of source
C. nature of the working substances
D. none of them
10 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them

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