Thermodynamics

Question 1

Reversible process entropy

Answer 1

Entropy remains constant

Question 2

Irreversible process entropy

Answer 2

Entropy of system increases

Question 3

Boltzman constant same unit as

Answer 3

Entropy and boltzman constant equal to R/Na

Question 4

Triple point of water

Answer 4

273.16K

Question 5

Net entropy is

Answer 5

Always positive

Question 6

Efficiency of carnot engine depends on

Answer 6

Temperature of hot and cold reservoirs and is independent of nature of working substance

Question 7

Efficiency always less than one

Answer 7

Cuz absolute temperature not attainanble and no engine is more efficient than carnot engine

Question 8

Refrigerator is

Answer 8

A heat engine operating in reverse order it transfers heat from low temperature compartment to high temperature surroundings with help of external work

Question 9

The reason for inability to use heat reservoir of oceans and atmosphere

Answer 9

There is no reservoir at a temperature lower than any of two

Question 10

Evaporation and liquefaction perdormed slowly are

Answer 10

Practically reversible and isothermal

Question 11

Changes involving friction and dissipation of energy through convection conduction and radiation are

Answer 11

Irreversible

Question 12

Molar specific heat at constant pressure is ______ than at constant volume

Answer 12

More

Question 13

Adiabat ______ isotherm

Answer 13

Lower

Question 14

At constant pressure

Answer 14

Isobaric process

Question 15

At constant volume

Answer 15

Isochoric process

Question 16

Slow process like evaporation and liquefaction

Answer 16

Isothermal

Question 17

Cloud formation

Answer 17

Adiabatic process

Question 18

For ideal gas potential energy is

Answer 18

Zero thus internal energy only depends on temperature

Question 19

Heat added is

Answer 19

Positive

Question 20

Heat lost is

Answer 20

Negative

Question 21

Work done by the system is

Answer 21

Positive

Question 22

Work done on the system is

Answer 22

Negative

Question 23

Both heat and work correspond to

Answer 23

Transfer of energy

Question 24

For monoatomic gas the potential energy

Answer 24

Is zero

Question 25

For diatomic gas

Answer 25

Translational, vibrational and rotational kinetic energy

Question 26

Thermal equilibrium

Answer 26

Same temperature

Question 27

Internal energy can be changed by

Answer 27

Adding heat and doing work on substance

Question 28

Energy in transit

Answer 28

Heat

Question 29

In cyclic process

Answer 29

All heat energy is used to do useful work as there is no change in internal energy