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

The curve representing an adiabatic process is called

Question # 2

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 3

Hotness and coldness of an object is represented in terms:

Question # 4

The nature of thermal radiation is similar to:

Question # 5

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

Question # 6

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 7

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

Question # 8

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 9

Truth of kinetic energy is confirmed by:

Question # 10

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

Question # 11

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 # 12

Average KE of a gas molecule has:

Question # 13

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 14

Boyle's law is applicable in

Question # 15

Maximum density of H2O is at the temperature

Question # 16

When two objects come to common temperature, the body is said to be in:

Question # 17

Melting point of ice

Question # 18

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

Question # 19

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 # 20

Triple point of water is

Question # 21

The bicycle pump provides a good example of

Question # 22

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

Question # 23

At constant volume temperature is increased. Then

Question # 24

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

Question # 25

The work done on the system by the environment is considered as

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

Electromagnetic waves emitted by hot bodies are called:

Question # 28

We can express the work in term of

Question # 29

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

Question # 30

The concept of entropy was introduced into the study of thermodynamics in

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
2 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
3 At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
A. 81 K
B. 355 K
C. 627 K
D. 627°C
4 The value of E0in coulomb's law is:
A. 9 x 109Nm2C-2
B. 8.85 x 10-12C2N-1m-2
C. 8.85 x 10-12Nm2C-2
D. 9 x 109C2N-1m-2
5 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
6 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
7 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
8 In the reverse process, the working substance passes through the same stages as in the direct process and
A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C. thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
9 Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
10 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly

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