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

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

Question # 2

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Question # 3

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

Question # 4

Good absorbers of heat are

Question # 5

The internal energy of a system does not depend upon the

Question # 6

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

Question # 7

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 8

The earliest heat engine was

Question # 9

The unit of thermodynamical scale is

Question # 10

The absolute temperature for an ideal gas is

Question # 11

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

Question # 12

The internal energy of an ideal gas system is generally the

Question # 13

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

Question # 14

At absolute temperature, the kinetic energy of the molecules

Question # 15

The number of translation degress of freedom for a diatomic gas is

Question # 16

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 # 17

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

Question # 18

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

Question # 19

Which of the following is not an assumption of kinetic energy

Question # 20

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

Question # 21

The curve representing an adiabatic process is called

Question # 22

The temperature of gas is produced by

Question # 23

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

Question # 24

The disorder in the system increases due to the

Question # 25

Energy gas behaves like an ideal gast at

Question # 26

According to kinetic theory of gases, molecules of a gas behave like

Question # 27

Real gases strictly obey gas law at:

Question # 28

The nature of thermal radiation is similar to:

Question # 29

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

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 Class Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
2 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
3 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
4 While deriving equation of pressure by kinetic theory of gases, we take into account:
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these
5 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
6 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
7 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
8 Efficiency of carnot engine is independent of the
A. temperature of sink
B. temperature of source
C. nature of the working substances
D. none of them
9 If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then
A. Cp- Cv= R
B. Cp- Cv < R
C. Cp- Cv = 0
D. Cp- Cv > R
10 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

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