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

Question # 2

We can express the work in term of

Question # 3

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 4

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

Question # 5

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

Question # 6

The curve representing an isothermal process is called

Question # 7

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

Question # 8

The pressure exerted by the gas is

Question # 9

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

Question # 10

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 11

Which quantity is important in stating the entropy of the system

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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 # 18

For the working of a heat engine, there must be

Question # 19

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

Question # 20

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

Question # 21

Energy gas behaves like an ideal gast at

Question # 22

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

Question # 23

The internal energy of a system does not depend upon the

Question # 24

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 29

During the whole carnot cycle

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 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
2 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
3 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
4 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
5 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
6 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
7 If a liquid is heated in weightlessness, the heat is transmitted through
A. Conduction
B. Convection
C. Radiation
D. Neither, because the liquid cannot be heated in weightlessness
8 If water in a closed bottle is taken up to the moon and opened, the water gets
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
9 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
10 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

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