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

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

Question # 2

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 # 3

The curve representing an isothermal process is called

Question # 4

The earliest heat engine was

Question # 5

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

Question # 6

A diatomic gas molecule has

Question # 7

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 8

When two objects are rubbed together, their internal energy

Question # 9

A process in which no heat enters or leaves the system is called

Question # 10

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 11

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

Question # 12

The Boltzman constant has the value

Question # 13

The motion of molecules in gases is:

Question # 14

At absolute temperature, the kinetic energy of the molecules

Question # 15

The bicycle pump provides a good example of

Question # 16

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

Question # 17

One kilogram of different substances contain

Question # 18

In an ideal gas, the molecules have:

Question # 19

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

Question # 20

On colliding in a closed container, the gas molecules

Question # 21

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

Question # 22

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 # 23

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

Question # 24

Pressure exerted by a gas is

Question # 25

Maximum density of H2O is at the temperature

Question # 26

When two objects come to common temperature, the body is said to be in:

Question # 27

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 # 28

Brownian motion increases due to

Question # 29

Rice takes longest to cook

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2
2 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
3 The pressure of gas everywhere inside the vessel will be the same provided the gas is of
A. Non-uniform density
B. uniform density
C. high density
D. low density
4 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
5 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
6 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
7 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
8 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
9 The only significant motion possessed by the mono-atomic gas represented is:
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
10 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them

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