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

We cannot utilize the heat contents of oceans and atmosphere because

Question # 2

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

Question # 3

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

Question # 4

The ideal gas law is

Question # 5

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 6

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

Question # 7

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 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

Question # 9

Brownian motion increases due to

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

In case of an ideal gas, the P.E associated with its molecule is

Question # 14

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 15

Which of the following is a state variable

Question # 16

A diatomic gas molecule has

Question # 17

When two objects are rubbed together, their internal energy

Question # 18

Energy gas behaves like an ideal gast at

Question # 19

The motion of molecules in gases is:

Question # 20

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

Question # 21

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

Question # 22

The volume of universal gas constant R is:

Question # 23

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 # 24

Which of the following is not an example of adiabatic process

Question # 25

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

Question # 26

Absolute temperature can be calculated by

Question # 27

The Boltzman constant has the value

Question # 28

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

Question # 29

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

Question # 30

The concept of entropy was introduced into the study of thermodynamics in

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The pressure exerted by the gas is
A. directly proportional to the P.E
B. inversely proportional to the P.E
C. inversely proportional to the K.E
D. directly proportional to the K.E
2 The nature of thermal radiation is similar to:
A. Ultraviolet rays
B. Light rays
C. Both of them
D. None of these
3 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
4 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
5 The behaviour of gases is well accounted by the kinetic theory based on
A. microscopic approach
B. macroscopic approach
C. both of them
D. none of them
6 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
7 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
8 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
9 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
10 The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. molar specific heat at constant volume

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