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

Real gases strictly obey gas law at:

Question # 2

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

Question # 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

Question # 4

At constant volume temperature is increased. Then

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

Question # 7

When two objects are rubbed together, their internal energy

Question # 8

Which of the following is a state variable

Question # 9

If an amount of heat enters the system it could

Question # 10

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

Question # 11

In case of an ideal gas, the P.E associated with its molecule is

Question # 12

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 13

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

Question # 14

Rate of diffusion is

Question # 15

A diatomic gas molecule has

Question # 16

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

Question # 17

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

Question # 18

The example of irreversible process is

Question # 19

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 20

Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure

Question # 21

A reversible cycle is the one in which

Question # 22

Which quantity is important in stating the entropy of the system

Question # 23

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

Question # 24

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

Question # 25

The ideal gas law is

Question # 26

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

Question # 27

Which of the following is not thermo dynamical function?

Question # 28

We cannot utilize the heat contents of oceans and atmosphere because

Question # 29

The curve representing an adiabatic process is called

Question # 30

The absolute temperature of the tripple point of water is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 In an adiabatic process the work is done at the expense of the
A. energy supplied to the system
B. energy gained from the surroundings
C. internal energy
D. none of them
2 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them
3 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
4 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
5 The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. molar specific heat at constant volume
6 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
7 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
8 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
9 In thermodynamics, internal energy is the function of
A. temperature
B. pressure
C. state
D. none of them
10 Which of the following is not an example of adiabatic process
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them

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