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

00:00
Question # 1

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

Question # 2

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

Question # 3

Rate of diffusion is

Question # 4

Good absorbers of heat are

Question # 5

On colliding in a closed container, the gas molecules

Question # 6

The internal energy of a system does not depend upon the

Question # 7

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

Question # 8

We cannot utilize the heat contents of oceans and atmosphere because

Question # 9

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

Question # 10

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 11

In thermodynamics, internal energy is the function of

Question # 12

Which quantity is important in stating the entropy of the system

Question # 13

While deriving the equation for pressure of a gas we consider the

Question # 14

First law of thermodynamics is consequence of conservation of

Question # 15

At absolute temperature, the kinetic energy of the molecules

Question # 16

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 17

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 # 18

The process which is carried out at constant temperature is known as

Question # 19

The behaviour of gases is well accounted by the kinetic theory based on

Question # 20

The nature of thermal radiation is similar to:

Question # 21

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 22

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 # 23

In the formula P = N0KT, N0denotes:

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

Adiabatic change occurs when the gas

Question # 30

The pressure exerted by the gas is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Efficiency of carnot engine is independent of the
A. temperature of sink
B. temperature of source
C. nature of the working substances
D. none of them
2 Which of the following is not an assumption of kinetic energy
A. a finite volume of gas consists of very large number of molecules
B. the gas molecules are in random motion
C. collision between the gas molecules are inelastic
D. the size of the gas molecules is much smaller than the separation between molecules
3 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
4 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
5 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
6 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
7 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
8 The product of the pressure and volume of an ideal gas is
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature
9 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
10 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them

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