Question # 1

In all natural processes where heat flows from one system to another, there is always a net

Choose an answer

decrease in entropy

increase in entropy

decrease or increase in entropy

none of them

Heat travels through vacuum by

Choose an answer

Conduction

Convection

Radiation

Both A and B

Which of the following is not an example of adiabatic process

Choose an answer

the rapid escape of air from a burst type

the rapid expansion and compression of air through which a sound wave is passing

cloud formation in the atmosphere

none of them

Carnot heat engine only used

Choose an answer

isothermal processes

adiabatic processes

both of them

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

The temperature scale approved in SI units is:

Choose an answer

Celsius scale

Kelvin scale

Fehrenheit scale

None of these

Absolute temperature can be calculated by

Choose an answer

Means squares velocity

Motion of the molecule

Both A and B

None of these

Truth of kinetic energy is confirmed by:

Choose an answer

Diffusion of gases

Brownian motion

Both A and B

None of these

On colliding in a closed container, the gas molecules

Choose an answer

Transfer momentum to the walls

Momentum becomes zero

Move in opposite directions

Perform Brownian motion

No spark plug is needed in

Choose an answer

petrol engine

diesel engine

both of them

none of them

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

Choose an answer

Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

The efficiency of diesel engine is

Choose an answer

25%

25 - 30%

35%

35 - 40%

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

A diatomic gas molecule has

Choose an answer

translational energy

rotaional energy

vibrational energy

all of them

The value of E₀in coulomb's law is:

Choose an answer

9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

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

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

Choose an answer

positive

negative

zero

any one of them

Which quantity is important in stating the entropy of the system

Choose an answer

initial entropy

final entropy

change in entropy

none of them

For the working of a heat engine, there must be

Choose an answer

a source of heat at high temperature

a sink at low temperature

both of them

none 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

The example of irreversible process is

Choose an answer

slowly liquification

slowly evaporation

an explosion

all of them

The state in which ice, water and vapour coexists in equilibrium is called

Choose an answer

zero degree celsius

zero degree fahrenheit

absolute zero

373 K

Triple point of water is

Choose an answer

273.16°F

372.16K

273.16°F

273.16

The rate of change of momentum of a molecule is equal to:

Choose an answer

Pressure

Work

Density

Force

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

Choose an answer

A greater than than of B

A is equal to that of B

A is less than that of B

A is twice the pressure of B

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 kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Choose an answer

1.7 x 10³J

10.2 x 10³J

3..4 x 10³J

6.8 x 10³J

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Choose an answer

adiabatically

isothermally

isochorcally

isobarically

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

In the theory of dimensional analysis, heat may be properly represented by:

Choose an answer

ML²T^-2

MT^-2

ML^-1T^-1

None of these

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

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