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

Triple point of water is

Question # 2

Average KE of a gas molecule has:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Which quantity is important in stating the entropy of the system

Question # 7

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

Question # 8

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

Question # 9

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Question # 10

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 11

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 12

The Boltzman constant has the value

Question # 13

When two objects are rubbed together, their internal energy

Question # 14

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

Question # 15

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 16

Efficiency of carnot engine is independent of the

Question # 17

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

Question # 18

No spark plug is needed in

Question # 19

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

Question # 20

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 # 21

The relationship between Boltzmann constant k with R and NAis given as:

Question # 22

The curve representing an isothermal process is called

Question # 23

Which of the following is not thermo dynamical function?

Question # 24

Truth of kinetic energy is confirmed by:

Question # 25

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 26

Adiabatic change occurs when the gas

Question # 27

For the working of a heat engine, there must be

Question # 28

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

Question # 29

If an amount of heat enters the system it could

Question # 30

The efficiency of diesel engine is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Which of the following does not have the same units:
A. Work
B. Heat
C. Kinetic energy
D. Power
2 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
3 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
4 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
5 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
6 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
7 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
8 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
9 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
10 The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be
A. 2.0 x 10-5/°C
B. 4.0x10-5/°C
C. 6.0x10-5/°C
D. 2.33x10-5/°C

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