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

Electromagnetic waves emitted by hot bodies are called:

Question # 2

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

Question # 3

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 4

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

Question # 5

In an ideal gas, the molecules have:

Question # 6

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

Question # 7

The unit of thermodynamical scale is

Question # 8

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

Question # 9

The internal energy of an ideal gas system is generally the

Question # 10

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

Question # 11

A reversible cycle is the one in which

Question # 12

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

Question # 13

Which of the following does not have the same units:

Question # 14

A diatomic gas molecule has

Question # 15

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

Question # 16

The curve representing an isothermal process is called

Question # 17

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

Question # 18

Which of the following is not an example of adiabatic process

Question # 19

Pressure of a gas at constant volume is proportion to

Question # 20

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

Question # 21

Hotness and coldness of an object is represented in terms:

Question # 22

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

Question # 23

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 # 24

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

Question # 25

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

Question # 26

No spark plug is needed in

Question # 27

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

Question # 28

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

Question # 29

Generally a temperature scale is established by

Question # 30

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>
2 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
3 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
4 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
5 In the theory of dimensional analysis, heat may be properly represented by:
A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
6 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
7 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
8 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
A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B
9 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
10 Real gases strictly obey gas law at:
A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these

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