Question # 1

An isochoric process is one which take place at

Choose an answer

Constant internal energy

Constant entropy

Constant volume

Constant pressure

Which quantity is important in stating the entropy of the system

Choose an answer

initial entropy

final entropy

change in entropy

none of them

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

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

Choose an answer

isochoric process

isothermal process

adiabatic process

none of them

Melting point of ice

Choose an answer

Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

The only significant motion possessed by the mono-atomic gas represented is:

Choose an answer

Translatory

Rotatory

Vibratory

None of these

The curve representing an isothermal process is called

Choose an answer

adiabat

isotherm

fixed temperature

none of them

In an ideal gas, the molecules have:

Choose an answer

Kinetic energy only

Potential energy only

Both KE and PE

None of these

The internal energy of an ideal gas system is generally the

Choose an answer

translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

In a heat engine, heat is supplied by the

Choose an answer

cold reservoir

sink

hot reservoir

none of them

A carnot cycle consists of

Choose an answer

One step

two step

three steps

four steps

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

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

If the distance between two charges is doubled, the force between them will become:

Choose an answer

Double

Half

Three times

One fourth

One third

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Choose an answer

70%

100%

35%

38%

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

The nature of thermal radiation is similar to:

Choose an answer

Ultraviolet rays

Light rays

Both of them

None of these

A diatomic gas molecule has

Choose an answer

translational energy

rotaional energy

vibrational energy

all of them

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

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

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

Choose an answer

very high temperature

very low temperature

any one of them

none of them

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Choose an answer

2V

3V

0.5V

V

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

Choose an answer

adiabatic process

isothermal process

isochoric process

none of them

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:

Choose an answer

Force

Density

Work done

Pressure

Which of the following is a state variable

Choose an answer

entropy

pressure

volume

all of them

Efficiency of carnot engine is independent of the

Choose an answer

temperature of sink

temperature of source

nature of the working substances

none of them

In an adiabatic expansion, the temperature of the gas

Choose an answer

increases

becomes zero

decreases

decreases rapidly

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

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Choose an answer

546 K

273 K

546°C

273°C

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Choose an answer

-2 mv

Zero

2 mv

mv

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

Choose an answer

0°C

10°C

17°C

20°C

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