Question

A steel bridge in a town is 200 m long. The minimum temperature in winter in the town is ${10}^{\circ }C$ and the maximum in summer is ${40}^{\circ }C$. The change in length of the bridge from winter to summer is :
(${\alpha }_{steel}=11\times {10}^{-6}{/}^{\circ }C$)

• A. 3.3 cm
• B. 6.6 cm
• C. 6.6 m
• D. 3.3 m

Answer 1

Answer: (B)

6.6 cm

Change in length $=$ 200 X 30 X 11 X ${10}^{-6}$ m
$=$ 6.6 cm