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

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

Question # 2

Efficiency of carnot engine is independent of the

Question # 3

For the working of a heat engine, there must be

Question # 4

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

In the theory of dimensional analysis, heat may be properly represented by:

Question # 9

The curve representing an isothermal process is called

Question # 10

Energy gas behaves like an ideal gast at

Question # 11

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 # 12

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 # 13

In an ideal gas, the molecules have:

Question # 14

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

Question # 15

First law of thermodynamics is consequence of conservation of

Question # 16

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Question # 17

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 18

The example of reversible process is

Question # 19

Melting point of ice

Question # 20

If an amount of heat enters the system it could

Question # 21

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

Question # 22

In an adiabatic process the work is done at the expense of the

Question # 23

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Question # 24

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 25

We can express the work in term of

Question # 26

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 # 27

Maximum density of H2O is at the temperature

Question # 28

The internal energy of a system does not depend upon the

Question # 29

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

Question # 30

Gas constant per molecule is called:

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Sr.# Question Answer
1 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
2 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
3 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
4 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
5 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
6 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
7 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
8 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
9 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
10 One kilogram of different substances contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them

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