Thermodynamics

Question 1

Thermodynamics

Answer 1

Is the branch dealing with transformation of heat energy into other forms of energy

Question 2

Zeroth law of thermodynamics

Answer 2

States that if body A is in equilibrium with body B
And body B is in equilibrium with body C
Then body A is in equilibrium with body C

Question 3

First law of thermodynamics states that

Answer 3

/\U = /\Q - /\W

It’s based on the law of conservation of energy

Question 4

Second Law of thermodynamics

Answer 4

(This law gives direction of heat flow)

1. Claudia Statement : it’s impossible to construct a machine that transfers heat from low temp. Body to a higher temp. Without any external source
2. Kelvin statement : Its impossible to obtain work continuously by cooling an object below the temp. of its surroundings
3. Kelvin-Planck Statement : It’s impossible to construct a machine that works on a cyclic process -absorbs heat from source, converts it into work and rejects no heat to the sink. In short it’s impossible to construct a perfect Carnot engine

Question 5

A perfect Carnot engine can’t be obtained because

Answer 5

It’s impossible to achieve absolute temperature

Question 6

W=?

Answer 6

P/\V

When V increases W is +ve

When V decrease W is -ve

Question 7

In case of gases work is done due to

Answer 7

Pressure of gas

Question 8

Work =

Answer 8

Area of P-V curve

If a cyclic process
Clockwise -> W is +ve
Anti-clockwise -> W is -ve