Thermodynamics

Question 1

What is the equation for first law of thermodynamics?

Answer 1

∆Q=∆U+∆W

Question 2

Q is taken positive when?

Answer 2

Heat is added to the system

Question 3

Q is taken negative when ?

Answer 3

Heat leaves the system

Question 4

U is taken positive when?

Answer 4

Heat of the system increases

Question 5

U is taken negative when?

Answer 5

Temperature of the system decreases

Question 6

If it is a cyclic process then?

Answer 6

∆Q=∆W

Question 7

What is regelation?

Answer 7

Melting under pressure and freezing again

Question 8

What remains constant in isochoric process?

Answer 8

Volume, ∆W=0

Question 9

On a pressure volume graph what is the shape of isochor?

Answer 9

Isochor is a straight line parallel to the pressure axis

Question 10

What is kept constant in an isobaric process?

Answer 10

Pressure

Question 11

Isobaric process is used to convert

Answer 11

Heat into work

Question 12

What remains constant in isothermal process?

Answer 12

Temperature, ∆Q=∆W

Question 13

What happens in adiabatic process?

Answer 13

Heat doesn’t enter or leave the system. ∆Q=0

Question 14

What is the shape of an isobar

Answer 14

Isobar is parallel to the volume axis

Question 15

What is the shape of an isotherm?

Answer 15

A curve on pressure-volume graph

Question 16

What is the shape of adiabat

Answer 16

Adiabat is steeper curve than an isotherm

Question 17

Cloud formation in the atmosphere is the example of?

Answer 17

Adiabatic process

Question 18

The measure of degree of hotness or coldness is?

Answer 18

Temperature

Question 19

What is specific heat?

Answer 19

The amount of heat energy required to raise the temperature of one kg of substance by one kelvin

Question 20

What is molar specific heat?

Answer 20

To raise the temperature of one mole of a substance by 1 kelvin

Question 21

The equation for molar specific heat is?

Answer 21

∆Q = Cmn∆T

Question 22

SI unit of molar specific heat is?

Answer 22

J mol -¹k-¹