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

Sadi carnot described an ideal heat engine in

Question # 2

Average KE of a gas molecule has:

Question # 3

The curve representing an isothermal process is called

Question # 4

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 5

The relationship between Boltzmann constant k with R and NAis given as:

Question # 6

Maximum density of H2O is at the temperature

Question # 7

At absolute temperature, the kinetic energy of the molecules

Question # 8

Efficiency of carnot engine is independent of the

Question # 9

Melting point of ice

Question # 10

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 11

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 # 12

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

Question # 13

The example of reversible process is

Question # 14

Adiabatic change occurs when the gas

Question # 15

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

Question # 16

The unit of thermodynamical scale is

Question # 17

In the formula P = N0KT, N0denotes:

Question # 18

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 19

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

Question # 20

Carnot heat engine only used

Question # 21

During the whole carnot cycle

Question # 22

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

Question # 23

The Boltzman constant has the value

Question # 24

Truth of kinetic energy is confirmed by:

Question # 25

The efficiency of diesel engine is

Question # 26

The absolute temperature for an ideal gas is

Question # 27

Brownian motion increases due to

Question # 28

Rate of diffusion is

Question # 29

The earliest heat engine was

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 First law of thermodynamic is special case of
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
2 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
3 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
4 The pressure exerted by the gas is
A. directly proportional to the P.E
B. inversely proportional to the P.E
C. inversely proportional to the K.E
D. directly proportional to the K.E
5 Generally a temperature scale is established by using certain physical properties of a material which varies
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
6 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
7 In the formula P = N0KT, N0denotes:
A. Number of molecules per unit per volume
B. Number of moles
C. Number of molecules
D. None of these
8 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
9 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
10 The second law of thermodynamics is concerned with the circumstances in which
A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them

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