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

Absolute zero is considered as that temperature at which:

Question # 2

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

Question # 3

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 4

The absolute temperature for an ideal gas is

Question # 5

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

Question # 6

A process in which no heat enters or leaves the system is called

Question # 7

In a heat engine, heat is supplied by the

Question # 8

The curve representing an isothermal process is called

Question # 9

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 10

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 # 11

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

Question # 12

The product of the pressure and volume of an ideal gas is

Question # 13

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

Question # 14

Boyle's law is applicable in

Question # 15

The internal energy of a system does not depend upon the

Question # 16

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 17

Gas constant per molecule is called:

Question # 18

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

Question # 19

A carnot cycle consists of

Question # 20

The Boltzman constant has the value

Question # 21

Efficiency of carnot engine is independent of the

Question # 22

Rice takes longest to cook

Question # 23

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

Question # 24

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

Question # 25

The number of translation degress of freedom for a diatomic gas is

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

Pressure exerted by a gas is

Question # 30

If the formula PV = nRT, n denotes:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
2 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
3 The second law of thermodynamics is concerned with the circumstances in which
A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them
4 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
5 The internal energy of an ideal gas system is generally the
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
6 At O° K which of the following properties of a gas will be zero?
A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
7 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
8 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
9 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
10 Absolute temperature can be calculated by
A. Means squares velocity
B. Motion of the molecule
C. Both A and B
D. None of these

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