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

Average KE of a gas molecule has:

Question # 2

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 # 3

When two objects come to common temperature, the body is said to be in:

Question # 4

According to kinetic theory of gases, molecules of a gas behave like

Question # 5

When heat is added into the system then change in entropy is

Question # 6

When two objects are rubbed together, their internal energy

Question # 7

For the working of a heat engine, there must be

Question # 8

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

Question # 9

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Maximum density of H2O is at the temperature

Question # 15

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

Question # 16

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

Question # 17

While deriving the equation for pressure of a gas we consider the

Question # 18

The temperature scale approved in SI units is:

Question # 19

The example of irreversible process is

Question # 20

Electromagnetic waves emitted by hot bodies are called:

Question # 21

The internal energy of an ideal gas system is generally the

Question # 22

The unit of thermodynamical scale is

Question # 23

In all natural processes where heat flows from one system to another, there is always a net

Question # 24

At constant volume temperature is increased. Then

Question # 25

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

Question # 26

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 27

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 # 28

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 29

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 # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Sadi carnot described an ideal heat engine in
A. 1820
B. 1840
C. 1860
D. 1880
2 If an amount of heat enters the system it could
A. decrease the internal energy
B. not change the internal energy
C. increase the internal energy
D. none of them
3 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
4 At O° K which of the following properties of a gas will be zero?
A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
5 If water in a closed bottle is taken up to the moon and opened, the water gets
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
6 The work done on the system by the environment is considered as
A. positive
B. negative
C. zero
D. any one of them
7 A real gas can be approximated to an ideal gas at
A. Low density
B. High pressure
C. High density
D. Low temperature
8 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
9 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
10 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process

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