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

Which of the following is not an assumption of kinetic energy

Question # 2

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

Question # 3

One mole of any substance contain

Question # 4

Energy gas behaves like an ideal gast at

Question # 5

The volume of universal gas constant R is:

Question # 6

At constant volume temperature is increased. Then

Question # 7

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 # 8

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

Question # 9

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 # 10

Electromagnetic waves emitted by hot bodies are called:

Question # 11

If the formula PV = nRT, n denotes:

Question # 12

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

Question # 13

In the formula P = N0KT, N0denotes:

Question # 14

An isochoric process is one which take place at

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

For the working of a heat engine, there must be

Question # 19

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

Question # 20

Internal energy is the sum of all the forms of

Question # 21

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 22

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 # 23

Pressure of a gas at constant volume is proportion to

Question # 24

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 25

At absolute temperature, the kinetic energy of the molecules

Question # 26

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

Question # 27

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

Question # 28

In the study of thermodynamics, which gas is considered as the working substance

Question # 29

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv
2 Real gases strictly obey gas law at:
A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these
3 A carnot cycle consists of
A. One step
B. two step
C. three steps
D. four steps
4 It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of
A. Clausius statement of second law
B. Kelvin'sstatement of second law
C. Clausius statement of first law
D. Kelvin's statement of first law
5 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
A. 300°C
B. 573°C
C. 600°C
D. 743°C
6 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
7 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
8 A process in which no heat enters or leaves the system is called
A. isochoric process
B. isothermal process
C. adiabatic process
D. none of them
9 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
10 Brownian motion increases due to
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium

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  • Bilal A Munir

    Bilal A Munir

    20 Jun 2018

    Nice

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