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 |
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
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
.
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