NEET Physics — Thermal Properties of Matter

A \( 0.2 \, \text{kg} \) aluminium block at \( 120^\circ \text{C} \) is placed in \( 0.8 \, \text{kg} \) of water at \( 20^\circ \text{C} \) in a \( 0.1 \, \text{kg} \) copper calorimeter at \( 20^\circ \text{C} \). What is the final temperature? (Specific heat of aluminium = \( 900 \, \text{J kg}^{-1} \text{K}^{-1} \), water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \), copper = \( 386 \, \text{J kg}^{-1} \text{K}^{-1} \))

A silver sphere of radius \( 8 \, \text{cm} \) at \( 70^\circ \text{C} \) is cooled to \( 20^\circ \text{C} \). What is the decrease in its volume? (\( \alpha_l = 1.9 \times 10^{-5} \, \text{K}^{-1} \))

What is the key difference between Celsius and Fahrenheit scales at the boiling point of water?

How much heat is required to convert \( 0.5 \, \text{kg} \) of ice at \( -20^\circ \text{C} \) to water at \( 10^\circ \text{C} \)? (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 = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \))

A steel rod has a length of \( 1 \, \text{m} \) at \( 20^\circ \text{C} \). What will be its length at \( 120^\circ \text{C} \) if the coefficient of linear expansion of steel is \( 1.2 \times 10^{-5} \, \text{K}^{-1} \)?