Question # 1

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

Choose an answer

rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

The efficiency of diesel engine is

Choose an answer

25%

25 - 30%

35%

35 - 40%

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

Choose an answer

increases

decreases

remains constant

none of them

Pressure exerted by a gas is

Choose an answer

Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

In which process the condition for the application of Boyle's law on the gas is fulfilled

Choose an answer

isochoric process

adiabatic process

isothermal process

none of them

At constant temperature, if the density of the gas is increased, its pressure will:

Choose an answer

One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

In a heat engine, heat is supplied by the

Choose an answer

cold reservoir

sink

hot reservoir

none of them

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

Choose an answer

adiabatic process

isothermal process

isochoric process

none of them

Boyle's law is applicable in

Choose an answer

Isochoric process

Isothermal process

Isobaric process

Isotonic process

One kilogram of different substances contain

Choose an answer

same number of molecules

different number of molecules

may be same or different

none of them

One mole of any substance contain

Choose an answer

same number of molecules

different number of molecules

may be same or different

none of them

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

Choose an answer

thermal effects at each stage are exactly reversed

mechanical effects at each stage are exactly reversed

thermal and mechanical effects at each stage remain the same

thermal and mechanical effects at each stage are exactly reversed

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

Choose an answer

2 : 1

4 : 1

1 : 4

3 : 4

Triple point of water is

Choose an answer

273.16°F

372.16K

273.16°F

273.16

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

Choose an answer

Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

At constant volume temperature is increased. Then

Choose an answer

Collision on walls will be less

Number of collisions per unit time will increase

Collision will be in straight lines

Collision will not change

Electromagnetic waves emitted by hot bodies are called:

Choose an answer

Photoelectrons

Alpha rays

Thermal radiation

None of these

We cannot utilize the heat contents of oceans and atmosphere because

Choose an answer

there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

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

Choose an answer

a reversible process

an irreversible process

any one of them

both of them

Truth of kinetic energy is confirmed by:

Choose an answer

Diffusion of gases

Brownian motion

Both A and B

None of these

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Choose an answer

heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

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

Choose an answer

microscopic approach

macroscopic approach

both of them

none of them

According to the second law, which is must to produce work

Choose an answer

a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

In an ideal gas, the molecules have:

Choose an answer

Kinetic energy only

Potential energy only

Both KE and PE

None of these

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

Choose an answer

N = nN_Am = MN_A

n = N N_A, M = mN_A

M = N_A/N , N_A= m/n

N = nN_A, M = mN_A

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

Choose an answer

Change in force

Change in momentum

Change in energy

Work done

The ideal gas law is

Choose an answer

P = nRT

V = nRT

PV =RT

PV =nRT

The Boltzman constant has the value

Choose an answer

1.38 x 10^-23JK^-1

1.28 x 10^-23JK^-1

1.38 x 10^-26JK^-1

1.28 x 10^-26JK^-1

At what temperature the adiabatic change is equivalent to the isothermal change?

Choose an answer

Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

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

Choose an answer

Ideal gas

Inert gas

Real gas

None of these

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

Choose an answer

Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

More Classes

Other Links

Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer