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

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 2

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

Question # 3

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 4

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Question # 5

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

Question # 6

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

Question # 7

The Boltzman constant has the value

Question # 8

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 # 9

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

Question # 10

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

Question # 11

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 12

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

Question # 13

Real gases strictly obey gas law at:

Question # 14

The pressure exerted by the gas is

Question # 15

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 16

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

Question # 17

Generally a temperature scale is established by

Question # 18

In the formula P = N0KT, N0denotes:

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

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 21

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

Question # 22

The rate of change of momentum of a molecule is equal to:

Question # 23

For the working of a heat engine, there must be

Question # 24

Electromagnetic waves emitted by hot bodies are called:

Question # 25

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 26

Heat travels through vacuum by

Question # 27

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

Question # 28

In all natural processes where heat flows from one system to another, there is always a net

Question # 29

Which of the following is not thermo dynamical function?

Question # 30

In case of an ideal gas, the P.E associated with its molecule is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1
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
2 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
3 The process which is carried out at constant temperature is known as
A. adiabatic process
B. isothermal process
C. isochoric process
D. none of them
4 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
5 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
6 Which of the following is not an assumption of kinetic energy
A. a finite volume of gas consists of very large number of molecules
B. the gas molecules are in random motion
C. collision between the gas molecules are inelastic
D. the size of the gas molecules is much smaller than the separation between molecules
7 The absolute temperature of the tripple point of water is
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
8 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
9 A carnot cycle consists of
A. One step
B. two step
C. three steps
D. four steps
10 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them

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