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 example of irreversible process is

Question # 2

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

Question # 3

Hotness and coldness of an object is represented in terms:

Question # 4

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

Question # 5

The bicycle pump provides a good example of

Question # 6

The curve representing an adiabatic process is called

Question # 7

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 # 8

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

Question # 9

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

Question # 10

Absolute zero is considered as that temperature at which:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The Boltzman constant has the value

Question # 15

The value of E0in coulomb's law is:

Question # 16

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

Question # 17

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

Question # 18

Generally a temperature scale is established by

Question # 19

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 # 20

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 21

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 22

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

Question # 23

Rice takes longest to cook

Question # 24

First law of thermodynamic is special case of

Question # 25

Maximum density of H2O is at the temperature

Question # 26

At constant volume temperature is increased. Then

Question # 27

A real gas can be approximated to an ideal gas at

Question # 28

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 29

The absolute temperature for an ideal gas is

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 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
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
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
3 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
4 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
5 On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
A. adiabatically
B. isothermally
C. isochorically
D. isobarically
6 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
7 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
8 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
9 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
10 The product of the pressure and volume of an ideal gas is
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature

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