Question # 1

Good absorbers of heat are

Choose an answer

Poor emitters

Non emitters

Good emitters

Highly polarized

In the formula P = N₀KT, N₀denotes:

Choose an answer

Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

The volume of universal gas constant R is:

Choose an answer

8.314 J/K mole K

8314 J/K mole K

8.314 J/mole K

None of these

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Choose an answer

how heat is absorbed

how heat extracted

how this conversion takes place

none of them

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

The efficiency of diesel engine is

Choose an answer

25%

25 - 30%

35%

35 - 40%

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

Choose an answer

Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

Brownian motion increases due to

Choose an answer

Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

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

Choose an answer

A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Choose an answer

Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

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

Choose an answer

300°C

573°C

600°C

743°C

A real gas can be approximated to an ideal gas at

Choose an answer

Low density

High pressure

High density

Low temperature

Which of the following is not an assumption of kinetic energy

Choose an answer

a finite volume of gas consists of very large number of molecules

the gas molecules are in random motion

collision between the gas molecules are inelastic

the size of the gas molecules is much smaller than the separation between molecules

Hotness and coldness of an object is represented in terms:

Choose an answer

Heat

Temperature

Chemical energy

None of these

Absolute zero is considered as that temperature at which:

Choose an answer

All liquid become gases

All gases become liquid

Water freezes

None of these

In a heat engine, heat is supplied by the

Choose an answer

cold reservoir

sink

hot reservoir

none of them

More Classes

Other Links

ECAT Physics 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