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

Gas constant per molecule is called:

Question # 2

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 # 3

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 4

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 5

According to kinetic theory of gases, molecules of a gas behave like

Question # 6

The internal energy of a system does not depend upon the

Question # 7

Which of the following is not an assumption of kinetic energy

Question # 8

The only significant motion possessed by the mono-atomic gas represented is:

Question # 9

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

Question # 10

Adiabatic change occurs when the gas

Question # 11

The curve representing an adiabatic process is called

Question # 12

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

Question # 13

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

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

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

Question # 16

The curve representing an isothermal process is called

Question # 17

For the working of a heat engine, there must be

Question # 18

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 19

We cannot utilize the heat contents of oceans and atmosphere because

Question # 20

In a heat engine, heat is supplied by the

Question # 21

A reversible cycle is the one in which

Question # 22

We can express the work in term of

Question # 23

Which of the following is not an example of adiabatic process

Question # 24

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 # 25

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 26

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

Question # 27

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

Question # 28

Pressure may be define as _______ per second per unit area:

Question # 29

In the formula P = N0KT, N0denotes:

Question # 30

First law of thermodynamics is consequence of conservation of

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
2 If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
A. 2 : 1
B. 4 : 1
C. 1 : 4
D. 3 : 4
3 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
4 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
5 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
6 The curve representing an adiabatic process is called
A. isotherm
B. adiabat
C. adiable
D. none of them
7 When two objects come to common temperature, the body is said to be in:
A. Static equilibrium
B. Dynamic equilibrium
C. Thermal equilibrium
D. None of these
8 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
9 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids
10 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

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