XII Physics Solved Numericals | Ch# 16 First Law of Thermodynamics 

Board: Sindh Boards
Class : 12, Second Year
Subject: Physics
Unit #16 First Law of Thermodynamics
Numericals:
1 A gas undergoes isothermal expansion at a constant temperature of 300 K. If the gas absorbs 500 J of heat during the process, calculate the work done by the gas. (500 J)
2. A piston compresses a gas adiabatically. If the initial volume is 0.02 m3 and the final volume is 0.01 m3, and the initial pressure is 200 kPa, determine the final pressure. Assume the gas behaves ideally. (400 kPa)
3. A system undergoes an isobaric process where the pressure is kept constant at 150 kPa. If the volume increases from 0.05 m3 to 0.08 m3,calculate the heat added to the system. (600J)
4. During an isochoric process, the internal energy of a gas increases by 300 J. If no work is done, determine the heat added to the system. (300 J)
5. A gas undergoes a cyclic process, starting at point A with a volume of 0.02 m3, going to B (isochoric heating), then to C (isothermal expansion), and finally back to A. If the heat added during isothermal expansion is 1000 J and the heat rejected during isochoric heating is 500 J, calculate the net work done by the system. (500 J)
6. A gas expands from 0.03 m3 to 0.06 m3 against a constant pressure of 100 kPa. Calculate the work done in both a reversible and an irreversible process, and compare the results. (300 J and 600 J)
7. A 50 g piece of copper at 100°C is placed in 200 g of water at 20°C. If the final temperature of the system is 30°C, calculate the specific heat capacity of copper. (Specific heat capacity of water = 4.18 J/g°C) (0.39 Jiff)
8. How much heat is required to raise the temperature of 1 kg of lead from 25°C to 100°C? (Specific heat capacity of lead = 0.128 J/g°C). (0240J).