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

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 2

A carnot cycle consists of

Question # 3

At O° K which of the following properties of a gas will be zero?

Question # 4

For the working of a heat engine, there must be

Question # 5

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

Question # 6

The pressure exerted by the gas is

Question # 7

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

Question # 8

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 # 9

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

Question # 10

Which of the following is not an assumption of kinetic energy

Question # 11

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

Question # 12

The temperature of gas is produced by

Question # 13

The value of E0in coulomb's law is:

Question # 14

Truth of kinetic energy is confirmed by:

Question # 15

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

Question # 16

When two objects are rubbed together, their internal energy

Question # 17

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

Question # 18

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

Question # 19

At absolute temperature, the kinetic energy of the molecules

Question # 20

In an adiabatic process the work is done at the expense of the

Question # 21

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

Question # 22

Pressure exerted by a gas is

Question # 23

A real gas can be approximated to an ideal gas at

Question # 24

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

The nature of thermal radiation is similar to:

Question # 29

The motion of molecules in gases is:

Question # 30

The work done on the system by the environment is considered as

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A succession of events which bring the system back to its initial condition is called
A. reversible process
B. irreversible process
C. a cycle
D. none of them
2 At O° K which of the following properties of a gas will be zero?
A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
3 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
4 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
5 If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
A. 2 : 1
B. 4 : 1
C. 1 : 4
D. 3 : 4
6 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
7 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
8 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
9 The internal energy of an ideal gas system is generally the
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
10 For making cooking utensils, which of the following pairs of properties is most suited?
A. Low specific heat and high conductivity
B. Low specific heat and low conductivity
C. High specific heat and high conductivity
D. High specific heat and low conductivity

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