ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Question # 1

The curve representing an isothermal process is called

Question # 2

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

Question # 3

If an amount of heat enters the system it could

Question # 4

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 5

The internal energy of an ideal gas system is generally the

Question # 6

In the formula P = N0KT, N0denotes:

Question # 7

In thermodynamics, internal energy is the function of

Question # 8

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 9

Electromagnetic waves emitted by hot bodies are called:

Question # 10

The motion of molecules in gases is:

Question # 11

One mole of any substance contain

Question # 12

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

Question # 13

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 # 14

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 15

Absolute zero is considered as that temperature at which:

Question # 16

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

Question # 17

Maximum density of H2O is at the temperature

Question # 18

For the working of a heat engine, there must be

Question # 19

A reversible cycle is the one in which

Question # 20

The second law of thermodynamics is concerned with the circumstances in which

Question # 21

Real gases strictly obey gas law at:

Question # 22

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

Question # 23

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

Question # 24

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 25

The disorder in the system increases due to the

Question # 26

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

Question # 27

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 28

The internal energy of a system does not depend upon the

Question # 29

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

Question # 30

A real gas can be approximated to an ideal gas at

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. molar specific heat at constant volume
3 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
4 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
A. 0 J
B. 2 J
C. 5 J
D. 10 J
5 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
6 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
7 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
8 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
9 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
10 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
A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>

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