Question # 1

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

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

During the whole carnot cycle

Choose an answer

Thermal equilibrium is maintained

mechanical equilibrium is maintained

both the thermal and mechanical equilibriumis maintained

both the thermal and mechanical equilibrium is not maintained

Electromagnetic waves emitted by hot bodies are called:

Choose an answer

Photoelectrons

Alpha rays

Thermal radiation

None of these

The ideal gas law is

Choose an answer

P = nRT

V = nRT

PV =RT

PV =nRT

The bicycle pump provides a good example of

Choose an answer

first law of thermodynamics

second law of thermodynamics

third law of thermodynamics

none of them

If an amount of heat enters the system it could

Choose an answer

decrease the internal energy

not change the internal energy

increase the internal energy

none of them

If the formula PV = nRT, n denotes:

Choose an answer

Number of molecules per unit volume

Number of moles

Number of molecules

None of these

In an ideal gas, the molecules have:

Choose an answer

Kinetic energy only

Potential energy only

Both KE and PE

None of these

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

Choose an answer

2.0 x 10^-5/°C

4.0x10^-5/°C

6.0x10^-5/°C

2.33x10^-5/°C

According to kinetic theory of gases, molecules of a gas behave like

Choose an answer

Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

The work done by the system on its environment is considered as

Choose an answer

positive

negative

zero

any one of them

The curve representing an isothermal process is called

Choose an answer

adiabat

isotherm

fixed temperature

none of them

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

Choose an answer

friction

heat losses

both of them

none of them

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

Choose an answer

Zero

Max

Min

-ve

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

Choose an answer

C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

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