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

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 # 2

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 3

A reversible cycle is the one in which

Question # 4

The Boltzman constant has the value

Question # 5

The efficiency of diesel engine is

Question # 6

In the theory of dimensional analysis, heat may be properly represented by:

Question # 7

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

Question # 8

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

Question # 9

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

Question # 10

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 11

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Question # 12

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

Question # 13

Adiabatic change occurs when the gas

Question # 14

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

Question # 15

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 16

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

Question # 17

Boyle's law is applicable in

Question # 18

In a heat engine, heat is supplied by the

Question # 19

Heat travels through vacuum by

Question # 20

Maximum density of H2O is at the temperature

Question # 21

Pressure exerted by a gas is

Question # 22

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 23

The temperature scale approved in SI units is:

Question # 24

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

Question # 25

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 26

Efficiency of carnot engine is independent of the

Question # 27

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

Question # 28

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

Question # 29

Which of the following is a state variable

Question # 30

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

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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 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
3 The heat required to raise the temperature of one mole of the substance through 1 K is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. all of them
4 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
5 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
6 Amount of heat required to raise the temperature of a body through 1 K is called its
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
7 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
8 In the theory of dimensional analysis, heat may be properly represented by:
A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
9 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
10 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them

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