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 example of reversible process is

Question # 2

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

Question # 3

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

Question # 4

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

Question # 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

Question # 6

The volume of universal gas constant R is:

Question # 7

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

Question # 8

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

Question # 9

The efficiency of diesel engine is

Question # 10

In a heat engine, heat is supplied by the

Question # 11

One kilogram of different substances contain

Question # 12

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

Question # 13

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

Question # 14

The basis to define a temperature scale that is independent of material properties is provided by

Question # 15

Which of the following does not have the same units:

Question # 16

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

Question # 17

For the working of a heat engine, there must be

Question # 18

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 19

The ideal gas law is

Question # 20

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 21

Gas constant per molecule is called:

Question # 22

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 23

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

Question # 24

A succession of events which bring the system back to its initial condition is called

Question # 25

If the distance between two charges is doubled, the force between them will become:

Question # 26

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 # 27

An isochoric process is one which take place at

Question # 28

Good absorbers of heat are

Question # 29

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 # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
2 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
3 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
4 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
5 According to kinetic theory of gases, molecules of a gas behave like
A. Inelastic spheres
B. Perfectly elastic rigid sphere
C. Perfectly elastic non-rigid spheres
D. Inelastic non-rigid spheres
6 The bicycle pump provides a good example of
A. first law of thermodynamics
B. second law of thermodynamics
C. third law of thermodynamics
D. none of them
7 The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :
A. 1.7 x 103J
B. 10.2 x 103J
C. 3..4 x 103J
D. 6.8 x 103J
8 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
9 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
10 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these

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