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

Efficiency of carnot engine is independent of the

Question # 2

Brownian motion increases due to

Question # 3

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 4

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

Question # 5

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

Question # 6

The concept of entropy was introduced into the study of thermodynamics in

Question # 7

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

Question # 8

A carnot cycle consists of

Question # 9

If the formula PV = nRT, n denotes:

Question # 10

When heat is added into the system then change in entropy is

Question # 11

When heat is removed from the system

Question # 12

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

Question # 13

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

Question # 14

Truth of kinetic energy is confirmed by:

Question # 15

Heat travels through vacuum by

Question # 16

Sadi carnot described an ideal heat engine in

Question # 17

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 # 18

When two objects are rubbed together, their internal energy

Question # 19

In an adiabatic expansion, the temperature of the gas

Question # 20

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

Question # 21

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 22

One kilogram of different substances contain

Question # 23

The Boltzman constant has the value

Question # 24

The motion of molecules in gases is:

Question # 25

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 # 26

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 # 27

One mole of any substance contain

Question # 28

The temperature of gas is produced by

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 The product of the pressure and volume of an ideal gas is
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature
3 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
4 We cannot utilize the heat contents of oceans and atmosphere because
A. there is no reservoir at the same temperature
B. there is no reservoir at the temperature lower than any one of two
C. there is no reservoir at the temperature higher than any one of two
D. none of them
5 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
6 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
7 On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
A. adiabatically
B. isothermally
C. isochorcally
D. isobarically
8 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
9 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
10 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy

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