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

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 # 2

Hotness and coldness of an object is represented in terms:

Question # 3

If the formula PV = nRT, n denotes:

Question # 4

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 # 5

According to the second law, which is must to produce work

Question # 6

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

Question # 7

Which of the following is not an example of adiabatic process

Question # 8

For the working of a heat engine, there must be

Question # 9

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 # 10

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

Question # 11

The volume of universal gas constant R is:

Question # 12

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

Question # 13

One mole of any substance contain

Question # 14

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 # 15

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 16

Which of the following does not have the same units:

Question # 17

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

Question # 18

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 # 19

Pressure exerted by a gas is

Question # 20

The efficiency of diesel engine is

Question # 21

A real gas can be approximated to an ideal gas at

Question # 22

The motion of molecules in gases is:

Question # 23

Maximum density of H2O is at the temperature

Question # 24

The absolute temperature of the tripple point of water is

Question # 25

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

Question # 26

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

Question # 27

Which of the following is a state variable

Question # 28

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 29

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

Question # 30

The temperature of gas is produced by

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
2 Pressure may be define as _______ per second per unit area:
A. Change in force
B. Change in momentum
C. Change in energy
D. Work done
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 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
5 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
6 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
7 The heat required to raise the temperature of one mole of the substance through 1 K is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. all of them
8 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
9 On a cold morning a metal surface will fell colder to touch than a wooden surface, because
A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
10 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly

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