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

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

Question # 2

A process in which no heat enters or leaves the system is called

Question # 3

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 4

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

Question # 5

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

Question # 6

The motion of molecules in gases is:

Question # 7

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

Question # 8

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 9

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 # 10

The state in which ice, water and vapour coexists in equilibrium is called

Question # 11

Rice takes longest to cook

Question # 12

The efficiency of diesel engine is

Question # 13

When heat is removed from the system

Question # 14

During the whole carnot cycle

Question # 15

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 16

In thermodynamics, internal energy is the function of

Question # 17

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

Question # 18

The basis to define a temperature scale that is independent of material properties is provided by

Question # 19

A heat engine is that which converts

Question # 20

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

Question # 21

The work done on the system by the environment is considered as

Question # 22

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

Question # 23

A reversible cycle is the one in which

Question # 24

The process which is carried out at constant temperature is known as

Question # 25

The earliest heat engine was

Question # 26

In a heat engine, heat is supplied by the

Question # 27

In an adiabatic expansion, the temperature of the gas

Question # 28

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

Question # 29

The internal energy of an ideal gas system is generally the

Question # 30

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 On colliding in a closed container, the gas molecules
A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
2 The absolute temperature of the tripple point of water is
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
3 The only significant motion possessed by the mono-atomic gas represented is:
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
4 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
5 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
6 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
7 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
8 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
A. 0 J
B. 2 J
C. 5 J
D. 10 J
9 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
10 What temperature is the same on Celsius scale as well as on Fahrenheit scale?
A. 32°C
B. -32°C
C. -40°C
D. -212°C

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