NEET Thermodynamics — Set 19

Question 1

A gas at $ 8 \, \text{atm} $ and $ 60^\circ \text{C} $ in a $ 7 \, \text{L} $ container is heated isochorically to $ 120^\circ \text{C} $. What is the final pressure?

Accepted Answer

For isochoric: $ \frac{P_1}{T_1} = \frac{P_2}{T_2} $. $ P_1 = 8 \, \text{atm} $, $ T_1 = 60 + 273 = 333 \, \text{K} $, $ T_2 = 120 + 273 = 393 \, \text{K} $. $ \frac{8}{333} = \frac{P_2}{393} \Rightarrow P_2 = \frac{8 \times 393}{333} \approx 9.44 \, \text{atm} $.

Question 2

Which process is characterized by no heat exchange between the system and its surroundings?

Accepted Answer

An adiabatic process is defined by no heat transfer ($ \Delta Q = 0 $) between the system and surroundings. This occurs when the system is insulated or the process is too rapid for heat exchange.

Question 3

Which of the following statements is incorrect about irreversible processes?

Accepted Answer

Irreversible processes (e.g., free expansion) involve non-equilibrium states or dissipation, preventing restoration without external effects. Option C is incorrect; they do not occur in equilibrium.

NEET Physics: Thermodynamics — Practice Set 19

Q1. A gas at \( 8 \, \text{atm} \) and \( 60^\circ \text{C} \) in a \( 7 \, \text{L} \) container is heated isochorically to \( 120^\circ \text{C} \). What is the final pressure?

Q2. Which process is characterized by no heat exchange between the system and its surroundings?

Q3. Which of the following statements is incorrect about irreversible processes?

Q4. Which of the following statements is correct about extensive variables?

Q5. How much heat is required to vaporize \( 1.2 \, \text{g} \) of water at \( 100^\circ \text{C} \) and \( 1 \, \text{atm} \)? (Latent heat = \( 2256 \, \text{J/g} \))

Q6. Why are most natural processes irreversible?

Q7. Which of the following statements is correct regarding the Kelvin-Planck statement?

Q8. What is the molar specific heat capacity at constant volume for a monatomic gas if \( R = 8.3 \, \text{J mol}^{-1} \text{K}^{-1} \)?

Q9. A system releases 700 J of heat and does 250 J of work. What is the change in internal energy?

Q10. Why is the work done path-dependent in thermodynamic processes?