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 rate of change of momentum of a molecule is equal to:

Question # 2

A carnot cycle consists of

Question # 3

The earliest heat engine was

Question # 4

A reversible cycle is the one in which

Question # 5

When two objects are rubbed together, their internal energy

Question # 6

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 7

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 # 8

A heat engine is that which converts

Question # 9

The pressure exerted by the gas is

Question # 10

Which quantity is important in stating the entropy of the system

Question # 11

Efficiency of carnot engine is independent of the

Question # 12

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 13

The volume of universal gas constant R is:

Question # 14

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 # 15

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 16

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

Question # 17

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 18

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 19

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

Question # 20

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

Question # 21

First law of thermodynamic is special case of

Question # 22

The example of irreversible process is

Question # 23

The absolute temperature for an ideal gas is

Question # 24

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

Question # 25

If the formula PV = nRT, n denotes:

Question # 26

The internal energy of an ideal gas system is generally the

Question # 27

The absolute temperature of the tripple point of water is

Question # 28

In a heat engine, heat is supplied by the

Question # 29

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Question # 30

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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ECAT Class Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
2 The pressure exerted by the gas is
A. directly proportional to the P.E
B. inversely proportional to the P.E
C. inversely proportional to the K.E
D. directly proportional to the K.E
3 While deriving the equation for pressure of a gas we consider the
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them
4 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
5 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
A. -20°C
B. 6.67°C
C. 5°C
D. 0°C
6 The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at
A. 546 K
B. 273 K
C. 546°C
D. 273°C
7 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
8 Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called
A. heat capacity
B. specific heat capacity
C. specific heat at constant volume
D. specific heat at constant pressure
9 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
10 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

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