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

Brownian motion increases due to

Question # 2

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 3

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 # 4

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

Question # 5

No spark plug is needed in

Question # 6

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 # 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

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

Question # 9

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

Question # 10

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 # 11

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

Question # 12

First law of thermodynamics is consequence of conservation of

Question # 13

The unit of thermodynamical scale is

Question # 14

The internal energy of an ideal gas system is generally the

Question # 15

If the formula PV = nRT, n denotes:

Question # 16

The concept of entropy was introduced into the study of thermodynamics in

Question # 17

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 18

The volume of universal gas constant R is:

Question # 19

A carnot cycle consists of

Question # 20

In thermodynamics, internal energy is the function of

Question # 21

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 # 22

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 # 23

Maximum density of H2O is at the temperature

Question # 24

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

Question # 25

Absolute temperature can be calculated by

Question # 26

The ideal gas law is

Question # 27

Good absorbers of heat are

Question # 28

The temperature of gas is produced by

Question # 29

According to kinetic theory of gases, molecules of a gas behave like

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 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
2 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
3 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
4 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure
5 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
6 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
7 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
8 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
9 The behaviour of gases is well accounted by the kinetic theory based on
A. microscopic approach
B. macroscopic approach
C. both of them
D. none of them
10 For making cooking utensils, which of the following pairs of properties is most suited?
A. Low specific heat and high conductivity
B. Low specific heat and low conductivity
C. High specific heat and high conductivity
D. High specific heat and low conductivity

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