ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Question # 1

The percentage of available heat energy converted into work by a petrol engine is roughly

Question # 2

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 3

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

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

A diatomic gas molecule has

Question # 6

The temperature scale approved in SI units is:

Question # 7

Brownian motion increases due to

Question # 8

In an ideal gas, the molecules have:

Question # 9

The efficiency of diesel engine is

Question # 10

A reversible cycle is the one in which

Question # 11

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

Question # 12

One kilogram of different substances contain

Question # 13

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 14

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 15

In thermodynamics, internal energy is the function of

Question # 16

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

Question # 17

Which of the following is not thermo dynamical function?

Question # 18

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 19

The example of irreversible process is

Question # 20

The bicycle pump provides a good example of

Question # 21

In the formula P = N0KT, N0denotes:

Question # 22

Internal energy is the sum of all the forms of

Question # 23

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

Question # 24

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

Question # 25

Generally a temperature scale is established by

Question # 26

If an amount of heat enters the system it could

Question # 27

Maximum density of H2O is at the temperature

Question # 28

The curve representing an isothermal process is called

Question # 29

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 # 30

The work done on the system by the environment is considered as

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 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 %
3 On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
A. adiabatically
B. isothermally
C. isochorically
D. isobarically
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
During the whole carnot cycle
A. Thermal equilibrium is maintained
B. mechanical equilibrium is maintained
C. both the thermal and mechanical equilibriumis maintained
D. both the thermal and mechanical equilibrium is not maintained
6 One kilogram of different substances contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
7 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
8 Generally a temperature scale is established by using certain physical properties of a material which varies
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
9 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
10 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv

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  • Bilal A Munir

    Bilal A Munir

    20 Jun 2018

    Nice

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