Question # 1

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

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

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

Choose an answer

Kinetic energy

Potential energy

Vibrational energy

Density

Hotness and coldness of an object is represented in terms:

Choose an answer

Heat

Temperature

Chemical energy

None of these

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

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

Choose an answer

positive

negative

zero

any one of them

The motion of molecules in gases is:

Choose an answer

Orderly

Random

Circular

All of these

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

If water in a closed bottle is taken up to the moon and opened, the water gets

Choose an answer

Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

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 a heat engine, heat is supplied by the

Choose an answer

cold reservoir

sink

hot reservoir

none of them

The pressure exerted by the gas is

Choose an answer

directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

While deriving the equation for pressure of a gas we consider the

Choose an answer

rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

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

The number of translation degress of freedom for a diatomic gas is

Choose an answer

2

3

5

6

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

The ideal gas law is

Choose an answer

P = nRT

V = nRT

PV =RT

PV =nRT

Which of the following is a state variable

Choose an answer

entropy

pressure

volume

all of them

When heat is removed from the system

Choose an answer

negative

positive

zero

any one of them

The relationship between Boltzmann constant k with R and N_Ais given as:

Choose an answer

k = RN_A

k =R/N_A

k = NR/N_A

None of these

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

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Choose an answer

Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

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 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

Truth of kinetic energy is confirmed by:

Choose an answer

Diffusion of gases

Brownian motion

Both A and B

None of these

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

Choose an answer

35 %

40 %

35 to 40 %

25 %

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

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

Choose an answer

Pressure

Work

Density

Force

Maximum density of H₂O is at the temperature

Choose an answer

32°F

39.2°F

42°F

4°F

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