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

Which of the following is not an assumption of kinetic energy

Question # 2

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 # 3

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

Question # 4

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 5

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

Question # 6

Rice takes longest to cook

Question # 7

Energy gas behaves like an ideal gast at

Question # 8

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 9

The nature of thermal radiation is similar to:

Question # 10

The temperature of gas is produced by

Question # 11

A carnot cycle consists of

Question # 12

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 # 13

If the formula PV = nRT, n denotes:

Question # 14

Real gases strictly obey gas law at:

Question # 15

The curve representing an isothermal process is called

Question # 16

When two objects are rubbed together, their internal energy

Question # 17

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

Question # 18

The value of E0in coulomb's law is:

Question # 19

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 # 20

Generally a temperature scale is established by

Question # 21

First law of thermodynamic is special case of

Question # 22

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

Question # 23

In an adiabatic process the work is done at the expense of the

Question # 24

The volume of universal gas constant R is:

Question # 25

The unit of thermodynamical scale is

Question # 26

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

Question # 27

The earliest heat engine was

Question # 28

Which of the following is a state variable

Question # 29

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 30

The Boltzman constant has the value

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
2 The basis to define a temperature scale that is independent of material properties is provided by
A. carbon cycle
B. nitrogen cycle
C. Carnot cycle
D. irreversible cycle
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 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
5 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
6 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
7 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
8 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
9 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
10 10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
A. Each have same number of molecules
B. Don't have same number of molecules
C. Can't be predicted
D. None

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