Question # 1

The percentage of available heat energy converted into work by a diesel engine is roughly

Choose an answer

35 %`

40 %

35 - 40 %

25 %

Generally a temperature scale is established by using certain physical properties of a material which varies

Choose an answer

nonlinearly with temperature

linearly with temperature

either of them

none of them

The temperature of gas is produced by

Choose an answer

At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

The example of irreversible process is

Choose an answer

slowly liquification

slowly evaporation

an explosion

all of them

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 a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

Choose an answer

second law thermodynamics

first law of thermodynamics

third law of thermodynamics

none of them

When heat is removed from the system

Choose an answer

negative

positive

zero

any one of them

The curve representing an adiabatic process is called

Choose an answer

isotherm

adiabat

adiable

none of them

When heat is added into the system then change in entropy is

Choose an answer

negative

positive

zero

any one of them

The nature of thermal radiation is similar to:

Choose an answer

Ultraviolet rays

Light rays

Both of them

None of these

While deriving equation of pressure by kinetic theory of gases, we take into account:

Choose an answer

Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

Which of the following does not have the same units:

Choose an answer

Work

Heat

Kinetic energy

Power

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Choose an answer

1 : 2

2 : 3

3 : 4

8 : 9

Energy gas behaves like an ideal gast at

Choose an answer

High temperature and low pressure

Low temperature and high pressure

Both A and B

None

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

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

At O° K which of the following properties of a gas will be zero?

Choose an answer

Kinetic energy

Potential energy

Vibrational energy

Density

Triple point of water is

Choose an answer

273.16°F

372.16K

273.16°F

273.16

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

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Choose an answer

adiabatically

isothermally

isochorically

isobarically

The heat required to raise the temperature of one mole of the substance through 1 K is called

Choose an answer

heat capacity

specific heat capacity

molar specific heat

all of them

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

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Choose an answer

100 K

273 K

0 K

-273 K

Internal energy is the sum of all the forms of

Choose an answer

K.E

P.E

both of them

none 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

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

Choose an answer

Change in force

Change in momentum

Change in energy

Work done

A carnot cycle consists of

Choose an answer

One step

two step

three steps

four steps

The second law of thermodynamics is concerned with the circumstances in which

Choose an answer

heat can be converted into work

direction of flow of heat

none of them

both of them

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

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

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

More Classes

Other Links

ECAT Pre General Science 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

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