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

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 # 2

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

Question # 3

During the whole carnot cycle

Question # 4

An isochoric process is one which take place at

Question # 5

Carnot heat engine only used

Question # 6

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

Question # 7

The internal energy of an ideal gas system is generally the

Question # 8

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

Question # 9

Absolute temperature can be calculated by

Question # 10

Good absorbers of heat are

Question # 11

The Boltzman constant has the value

Question # 12

The example of irreversible process is

Question # 13

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

Question # 14

In an ideal gas, the molecules have:

Question # 15

The second law of thermodynamics is concerned with the circumstances in which

Question # 16

In a heat engine, heat is supplied by the

Question # 17

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

Question # 18

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

Question # 19

In the formula P = N0KT, N0denotes:

Question # 20

Pressure exerted by a gas is

Question # 21

The curve representing an isothermal process is called

Question # 22

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

Question # 23

The value of E0in coulomb's law is:

Question # 24

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 # 25

A diatomic gas molecule has

Question # 26

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

Question # 27

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 28

Which of the following is not thermo dynamical function?

Question # 29

Gas constant per molecule is called:

Question # 30

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
2 Which of the following is not an example of adiabatic process
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them
3 If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then
A. Cp- Cv= R
B. Cp- Cv < R
C. Cp- Cv = 0
D. Cp- Cv > R
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 In the theory of dimensional analysis, heat may be properly represented by:
A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
6 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
7 The pressure of gas everywhere inside the vessel will be the same provided the gas is of
A. Non-uniform density
B. uniform density
C. high density
D. low density
8 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
9 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
10 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%

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