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

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

Question # 2

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 3

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

Question # 4

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

Question # 5

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 6

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

Question # 7

At absolute temperature, the kinetic energy of the molecules

Question # 8

Which of the following does not have the same units:

Question # 9

Boyle's law is applicable in

Question # 10

The internal energy of an ideal gas system is generally the

Question # 11

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

Question # 12

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 13

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

Question # 14

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 # 15

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

Question # 16

We can express the work in term of

Question # 17

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

Question # 18

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

Question # 19

If the formula PV = nRT, n denotes:

Question # 20

First law of thermodynamic is special case of

Question # 21

The ideal gas law is

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

Gas constant per molecule is called:

Question # 26

The behaviour of gases is well accounted by the kinetic theory based on

Question # 27

Truth of kinetic energy is confirmed by:

Question # 28

Absolute temperature can be calculated by

Question # 29

The example of irreversible process is

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
2 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
3 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
4 On a cold morning a metal surface will fell colder to touch than a wooden surface, because
A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
5 Adiabatic change occurs when the gas
A. expands
B. compressed
C. expands or compressed
D. expands or compressed rapidly
6 In thermodynamics, internal energy is the function of
A. temperature
B. pressure
C. state
D. none of them
7 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
8 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
9 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
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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