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 $1.2 \times 10^{-5} \, \text{K}^{-1}$?