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

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

Question # 2

Which of the following is not thermo dynamical function?

Question # 3

The absolute temperature of the tripple point of water is

Question # 4

If the volume of the gas is to be increased by 4 times, then

Question # 5

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

The example of reversible process is

Question # 12

The curve representing an adiabatic process is called

Question # 13

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 # 14

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

Question # 15

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Question # 16

Average KE of a gas molecule has:

Question # 17

The motion of molecules in gases is:

Question # 18

Maximum density of H2O is at the temperature

Question # 19

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

Question # 20

The temperature of gas is produced by

Question # 21

A reversible cycle is the one in which

Question # 22

The absolute temperature for an ideal gas is

Question # 23

For the working of a heat engine, there must be

Question # 24

Hotness and coldness of an object is represented in terms:

Question # 25

Carnot heat engine only used

Question # 26

Pressure may be define as _______ per second per unit area:

Question # 27

The disorder in the system increases due to the

Question # 28

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

Question # 29

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 30

The curve representing an isothermal process is called

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them
2 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
3 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
4 Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure
A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B
5 On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
A. adiabatically
B. isothermally
C. isochorcally
D. isobarically
6 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one 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 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
9 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
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
10 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6

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