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 highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 2

Which quantity is important in stating the entropy of the system

Question # 3

A process is a reversible process, if the entropy of the system

Question # 4

In all natural processes where heat flows from one system to another, there is always a net

Question # 5

The disorder in the system increases due to the

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

When two objects are rubbed together, their internal energy

Question # 10

Gas constant per molecule is called:

Question # 11

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

Question # 12

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

Question # 13

Which of the following is not an example of adiabatic process

Question # 14

The state in which ice, water and vapour coexists in equilibrium is called

Question # 15

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

Question # 16

We can express the work in term of

Question # 17

In an adiabatic expansion, the temperature of the gas

Question # 18

Pressure of a gas at constant volume is proportion to

Question # 19

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

Question # 20

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 21

According to the second law, which is must to produce work

Question # 22

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

Question # 23

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

Question # 24

Efficiency of carnot engine is independent of the

Question # 25

At absolute temperature, the kinetic energy of the molecules

Question # 26

Carnot heat engine only used

Question # 27

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 # 28

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

Question # 29

Sadi carnot described an ideal heat engine in

Question # 30

At constant volume temperature is increased. Then

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The absolute temperature for an ideal gas is
A. directly proportional to the rotational K.E of gas molecules
B. directly proportional to the vibrational K.E of gas molecules
C. directly proportional to the average translational K.E.of gas molecules
D. directly proportional to the P.E. of gas molecules
2 A carnot cycle consists of
A. One step
B. two step
C. three steps
D. four steps
3 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
4 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids
5 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
6 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
7 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
8 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
9 It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of
A. Clausius statement of second law
B. Kelvin'sstatement of second law
C. Clausius statement of first law
D. Kelvin's statement of first law
10 If an amount of heat enters the system it could
A. decrease the internal energy
B. not change the internal energy
C. increase the internal energy
D. none of them

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