NEET Physics: Thermal Properties of Matter — Practice Set 10

Q1. How much heat is required to raise the temperature of \( 2 \, \text{kg} \) of water from \( 20^\circ \text{C} \) to \( 50^\circ \text{C} \)? (Specific heat capacity of water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \))

Q2. A brass rod of length \( 2 \, \text{m} \) at \( 25^\circ \text{C} \) is heated to \( 125^\circ \text{C} \). Calculate the increase in length. (Coefficient of linear expansion of brass = \( 1.8 \times 10^{-5} \, \text{K}^{-1} \))

Q3. A silver ring has an inner circumference of \( 31.4 \, \text{cm} \) at \( 15^\circ \text{C} \). What temperature must it be heated to for the circumference to increase by \( 0.0597 \, \text{cm} \)? (\( \alpha_l = 1.9 \times 10^{-5} \, \text{K}^{-1} \))

Q4. A copper block of mass \( 0.5 \, \text{kg} \) at \( 100^\circ \text{C} \) is dropped into \( 1 \, \text{kg} \) of water at \( 20^\circ \text{C} \). Find the final temperature. (Specific heat of copper = \( 386 \, \text{J kg}^{-1} \text{K}^{-1} \), water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \))

Q5. A silver wire of length \( 1.2 \, \text{m} \) at \( 25^\circ \text{C} \) is cooled until its length decreases by \( 0.0228 \, \text{cm} \). What is the final temperature? (\( \alpha_l = 1.9 \times 10^{-5} \, \text{K}^{-1} \))

Q6. Which temperature scale uses \( 32^\circ \) and \( 212^\circ \) as the freezing and boiling points of water at standard pressure?

Q7. A brass ring has an inner diameter of \( 10 \, \text{cm} \) at \( 40^\circ \text{C} \). What temperature must it be cooled to for the diameter to decrease by \( 0.009 \, \text{cm} \)? (\( \alpha_l = 1.8 \times 10^{-5} \, \text{K}^{-1} \))

Q8. A \( 0.15 \, \text{kg} \) aluminium block at \( 280^\circ \text{C} \) is placed in \( 0.7 \, \text{kg} \) water at \( 22^\circ \text{C} \) in a \( 0.05 \, \text{kg} \) lead calorimeter at \( 22^\circ \text{C} \). What is the final temperature? (Specific heat of aluminium = \( 900 \, \text{J kg}^{-1} \text{K}^{-1} \), water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \), lead = \( 127.7 \, \text{J kg}^{-1} \text{K}^{-1} \))

Q9. Why do gases expand more than solids for the same temperature increase?

Q10. What happens to the boiling point of a liquid when external pressure decreases?

Physics — Thermal Properties of Matter

Set 10 of 13

15:00

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1Question 1 of 10
Medium

How much heat is required to raise the temperature of \( 2 \, \text{kg} \) of water from \( 20^\circ \text{C} \) to \( 50^\circ \text{C} \)? (Specific heat capacity of water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \))