NEET Physics: Thermal Properties of Matter — Practice Set 2

Q1. How much heat is needed to convert \( 0.1 \, \text{kg} \) of mercury at \( -39^\circ \text{C} \) to liquid at \( 357^\circ \text{C} \)? (Specific heat of solid mercury = \( 140 \, \text{J kg}^{-1} \text{K}^{-1} \), latent heat of fusion = \( 0.12 \times 10^5 \, \text{J kg}^{-1} \), specific heat of liquid mercury = \( 140 \, \text{J kg}^{-1} \text{K}^{-1} \))

Q2. A copper rod of length \( 80 \, \text{cm} \) at \( 40^\circ \text{C} \) is cooled until its length decreases by \( 0.0136 \, \text{cm} \). What is the final temperature? (\( \alpha_l = 1.7 \times 10^{-5} \, \text{K}^{-1} \))

Q3. A \( 0.15 \, \text{kg} \) mercury block at \( 400^\circ \text{C} \) is placed in \( 0.5 \, \text{kg} \) water at \( 20^\circ \text{C} \) in a \( 0.05 \, \text{kg} \) aluminium calorimeter at \( 20^\circ \text{C} \). Find the final temperature. (Specific heat of mercury = \( 140 \, \text{J kg}^{-1} \text{K}^{-1} \), water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \), aluminium = \( 900 \, \text{J kg}^{-1} \text{K}^{-1} \))

Q4. During the melting of ice at \( 0^\circ \text{C} \), why does the temperature remain constant despite heat being supplied?

Q5. Which temperature scale uses absolute zero as its starting point?

Q6. A gas at \( 2.4 \, \text{atm} \) and \( 87^\circ \text{C} \) occupies \( 7 \, \text{L} \). If the temperature is lowered to \( 37^\circ \text{C} \) and pressure adjusted to \( 3 \, \text{atm} \), what is the percentage change in volume?

Q7. Which of the following correctly relates the coefficients of linear and area expansion?

Q8. How much heat is required to raise \( 0.8 \, \text{kg} \) of aluminium from \( 25^\circ \text{C} \) to \( 75^\circ \text{C} \) if its specific heat capacity is \( 900 \, \text{J kg}^{-1} \text{K}^{-1} \)?

Q9. How much heat is required to convert \( 0.25 \, \text{kg} \) of ice at \( -30^\circ \text{C} \) to steam at \( 120^\circ \text{C} \)? (Specific heat of ice = \( 2100 \, \text{J kg}^{-1} \text{K}^{-1} \), latent heat of fusion = \( 3.35 \times 10^5 \, \text{J kg}^{-1} \), specific heat of water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \), latent heat of vaporization = \( 2.256 \times 10^6 \, \text{J kg}^{-1} \))

Q10. How much heat is required to raise \( 0.4 \, \text{kg} \) of water from \( 15^\circ \text{C} \) to \( 85^\circ \text{C} \) and then convert \( 0.25 \, \text{kg} \) to steam at \( 100^\circ \text{C} \) in a \( 0.2 \, \text{kg} \) silver calorimeter initially at \( 15^\circ \text{C} \)? (Specific heat of water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \), silver = \( 236 \, \text{J kg}^{-1} \text{K}^{-1} \), latent heat of vaporization = \( 2.256 \times 10^6 \, \text{J kg}^{-1} \))

Physics — Thermal Properties of Matter

Set 2 of 13

15:00

Sign in to save your score and view detailed explanations

Sign In Free
1Question 1 of 10
Medium

How much heat is needed to convert \( 0.1 \, \text{kg} \) of mercury at \( -39^\circ \text{C} \) to liquid at \( 357^\circ \text{C} \)? (Specific heat of solid mercury = \( 140 \, \text{J kg}^{-1} \text{K}^{-1} \), latent heat of fusion = \( 0.12 \times 10^5 \, \text{J kg}^{-1} \), specific heat of liquid mercury = \( 140 \, \text{J kg}^{-1} \text{K}^{-1} \))