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

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

Question # 2

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

Question # 3

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 4

A carnot cycle consists of

Question # 5

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

Question # 6

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

Question # 7

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 8

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 9

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

Question # 10

First law of thermodynamics is consequence of conservation of

Question # 11

Gas constant per molecule is called:

Question # 12

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 13

Average KE of a gas molecule has:

Question # 14

Absolute zero is considered as that temperature at which:

Question # 15

Energy gas behaves like an ideal gast at

Question # 16

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

Question # 17

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 # 18

The unit of thermodynamical scale is

Question # 19

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

Question # 20

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

Question # 21

The Boltzman constant has the value

Question # 22

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 # 23

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 # 24

The nature of thermal radiation is similar to:

Question # 25

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

Question # 26

Pressure exerted by a gas is

Question # 27

The second law of thermodynamics is concerned with the circumstances in which

Question # 28

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

Question # 29

The pressure exerted by the gas is

Question # 30

In an ideal gas, the molecules have:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
2 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
3 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
4 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
5 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
6 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
7 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
8 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
9 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
10 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2

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