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

00:00
Question # 1

Electromagnetic waves emitted by hot bodies are called:

Question # 2

The internal energy of an ideal gas system is generally the

Question # 3

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

Question # 4

The curve representing an adiabatic process is called

Question # 5

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 6

Which of the following is a state variable

Question # 7

Carnot heat engine only used

Question # 8

At O° K which of the following properties of a gas will be zero?

Question # 9

Melting point of ice

Question # 10

During the whole carnot cycle

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The unit of thermodynamical scale is

Question # 15

Pressure of a gas at constant volume is proportion to

Question # 16

The example of reversible process is

Question # 17

Sadi carnot described an ideal heat engine in

Question # 18

Rate of diffusion is

Question # 19

No spark plug is needed in

Question # 20

A process is a reversible process, if the entropy of the system

Question # 21

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

Question # 22

A real gas can be approximated to an ideal gas at

Question # 23

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 # 24

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 25

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

Question # 26

When heat is added into the system then change in entropy is

Question # 27

The absolute temperature for an ideal gas is

Question # 28

The volume of universal gas constant R is:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
2 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
3 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
4 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
5 The relationship between Boltzmann constant k with R and NAis given as:
A. k = RNA
B. k =R/NA
C. k = NR/NA
D. None of these
6 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
7 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
8 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
9 In case of an ideal gas, the P.E associated with its molecule is
A. maximum
B. zero
C. minimum
D. not fixed
10 According to the second law, which is must to produce work
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy

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