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

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

Question # 2

The nature of thermal radiation is similar to:

Question # 3

The internal energy of a system does not depend upon the

Question # 4

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

Question # 5

Absolute zero is considered as that temperature at which:

Question # 6

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 7

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

Question # 8

Real gases strictly obey gas law at:

Question # 9

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

Question # 10

The Boltzman constant has the value

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

A reversible cycle is the one in which

Question # 13

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 # 14

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

Question # 15

The process which is carried out at constant temperature is known as

Question # 16

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 # 17

Maximum density of H2O is at the temperature

Question # 18

Adiabatic change occurs when the gas

Question # 19

Carnot heat engine only used

Question # 20

A real gas can be approximated to an ideal gas at

Question # 21

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

Question # 22

Sadi carnot described an ideal heat engine in

Question # 23

The example of reversible process is

Question # 24

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

Question # 25

Melting point of ice

Question # 26

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 # 27

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

Question # 28

No spark plug is needed in

Question # 29

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 30

Pressure of a gas at constant volume is proportion to

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Absolute temperature can be calculated by
A. Means squares velocity
B. Motion of the molecule
C. Both A and B
D. None of these
2 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
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
A. 2V
B. 3V
C. 0.5V
D. V
4 Rice takes longest to cook
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest
5 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
6 Energy gas behaves like an ideal gast at
A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
7 The behaviour of gases is well accounted by the kinetic theory based on
A. microscopic approach
B. macroscopic approach
C. both of them
D. none of them
8 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
9 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
10 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

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