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

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 2

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 # 3

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

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

The volume of universal gas constant R is:

Question # 6

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

Question # 7

Pressure of a gas at constant volume is proportion to

Question # 8

In the formula P = N0KT, N0denotes:

Question # 9

The ideal gas law is

Question # 10

The unit of thermodynamical scale is

Question # 11

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 # 12

Maximum density of H2O is at the temperature

Question # 13

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

Question # 14

One kilogram of different substances contain

Question # 15

The Boltzman constant has the value

Question # 16

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

Question # 17

The bicycle pump provides a good example of

Question # 18

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

Question # 19

A reversible cycle is the one in which

Question # 20

The process which is carried out at constant temperature is known as

Question # 21

The motion of molecules in gases is:

Question # 22

The percentage of available heat energy converted into work by a diesel engine is roughly

Question # 23

Which quantity is important in stating the entropy of the system

Question # 24

The temperature scale approved in SI units is:

Question # 25

The temperature of gas is produced by

Question # 26

Carnot heat engine only used

Question # 27

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

Question # 28

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

Question # 29

Gas constant per molecule is called:

Question # 30

The absolute temperature of the tripple point of water is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Maximum density of H2O is at the temperature
A. 32°F
B. 39.2°F
C. 42°F
D. 4°F
2 In an ideal gas, the molecules have:
A. Kinetic energy only
B. Potential energy only
C. Both KE and PE
D. None of these
3 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
4 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
5 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>
6 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
7 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
8 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
9 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
10 Rice takes longest to cook
A. In a submarine 100 m below the surface of the sea
B. At sea level
C. At Murree
D. At Mount Everest

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