Q1. What happens to the temperature of a gas during an isothermal expansion? (2021)
Solution:
During an isothermal expansion, the temperature of the gas remains constant as the system absorbs heat to do work.
⏱ Time: 0s
Q2. In a Carnot engine operating between temperatures T1 and T2, what is the efficiency (η) of the engine? (2023)
Solution:
The efficiency of a Carnot engine is given by η = 1 - T2/T1.
⏱ Time: 0s
Q3. In a Carnot engine, the efficiency depends on which of the following? (2023)
Solution:
The efficiency of a Carnot engine is determined by the temperatures of the hot and cold reservoirs, given by the formula η = 1 - (T_c/T_h).
⏱ Time: 0s
Q4. Which of the following statements is true for an adiabatic process? (2022) 2022
Solution:
In an adiabatic process, there is no heat exchange with the surroundings, and the temperature of the system changes due to work done on or by the system.
⏱ Time: 0s
Q5. In a cyclic process, the net work done is equal to: (2020)
Solution:
In a cyclic process, the net work done is equal to the net heat added to the system, as the internal energy returns to its initial state.
⏱ Time: 0s
Q6. In an isothermal process, the temperature of the system remains: (2023)
Solution:
In an isothermal process, the temperature of the system remains constant.
⏱ Time: 0s
Q7. Which of the following statements is true for an isochoric process? (2023)
Solution:
In an isochoric process, the volume of the system remains constant.
⏱ Time: 0s
Q8. Which of the following processes is irreversible? (2022)
Solution:
Free expansion is an irreversible process as it occurs without any external pressure acting on the gas.
⏱ Time: 0s
Q9. What is the specific heat capacity of water at constant pressure (C_p)? (2020)
Solution:
The specific heat capacity of water at constant pressure is approximately 4.18 J/g°C.
⏱ Time: 0s
Q10. What is the change in internal energy of an ideal gas when it is heated at constant volume? (2021) 2021
Solution:
At constant volume, the change in internal energy (ΔU) is equal to the heat added (Q). Therefore, ΔU = Q.
