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

We cannot utilize the heat contents of oceans and atmosphere because

Question # 2

Triple point of water is

Question # 3

Internal energy is the sum of all the forms of

Question # 4

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Question # 5

The motion of molecules in gases is:

Question # 6

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 7

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

Question # 8

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

Question # 9

According to the second law, which is must to produce work

Question # 10

A carnot cycle consists of

Question # 11

Boyle's law is applicable in

Question # 12

If the formula PV = nRT, n denotes:

Question # 13

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 14

The temperature of gas is produced by

Question # 15

Which of the following is not thermo dynamical function?

Question # 16

Pressure exerted by a gas is

Question # 17

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

Question # 18

Generally a temperature scale is established by

Question # 19

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

Question # 20

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

Question # 21

The relationship between Boltzmann constant k with R and NAis given as:

Question # 22

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

Question # 23

Rice takes longest to cook

Question # 24

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 25

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

Question # 26

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

Question # 27

The unit of thermodynamical scale is

Question # 28

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

Question # 29

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

Question # 30

A succession of events which bring the system back to its initial condition is called

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
3 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
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
4 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
5 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
6 The absolute temperature for an ideal gas is
A. directly proportional to the rotational K.E of gas molecules
B. directly proportional to the vibrational K.E of gas molecules
C. directly proportional to the average translational K.E.of gas molecules
D. directly proportional to the P.E. of gas molecules
7 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
8 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
9 In the reverse process, the working substance passes through the same stages as in the direct process and
A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C. thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
10 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:
A. Double
B. Remains constant
C. Half
D. None of these

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