Match the item in column I and in column II.
 
Column I Column II
a. No heat is absorbed by the system from the surroundings, but work (w) is done on the system. i. ∆U = q – w, closed system.
b. No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. ii. ∆U = wad, a wall is adiabatic
c.  w amount of work is done by the system and q amount of heat is supplied to the system. iii. ∆U  = –q, thermally conducting walls
 
1. a = i; b=ii; c=iii
2. a = ii; b=i; c=iii
3. a = ii; b=iii; c=i
4. a = iii; b=ii; c=i
Subtopic:  First Law of Thermodynamics |
 82%
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Two litres of an ideal gas at a pressure of 10 atm expands isothermally at 25 °C into a vacuum until its total volume is 10 litres. The amount of heat absorbed during expansion is-

1. 80 J

2. -80 J

3. Zero

4. 50 J

Subtopic:  First Law of Thermodynamics |
 63%
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Two litres of an ideal gas at a pressure of 10 atm expands isothermally at 25 °C against a constant external pressure of 1 atm until its total volume is 10 litres. The amount of heat absorbed during expansion is-

1. 80 atm L

2. -80 atm L

3. -8 atm L

4. 8 atm L

 

.

Subtopic:  First Law of Thermodynamics |
From NCERT
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Two litres of 1 mol an ideal gas at a pressure of 10 atm expands isothermally at 25 °C into a vacuum until its total volume is 10 litres. The amount of heat absorbed during expansion is:
(Given: log 5 = 0.699)

1. 51. 39 atm L

2. 39.36 atm L

3. 37. 34 atm ml

4. 26. 49 atm L

Subtopic:  First Law of Thermodynamics |
 59%
From NCERT
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