1) A metallic bar is heated from 0° C to 100° C. The coefficient of linear expansion is $10^{-5}K^{-1}$. What will be the percentage increase in length A) 0.01% B) 0.1% C) 1% D) 10% Answer: Option BExplanation:$\frac{\triangle l}{l}=\alpha \triangle T=10^{-5}\times 100=10^{-3}$ $\frac{\triangle l}{l}\times 100$ % $=10^{-3}\times 100=10^{-1}=0.1$ %
