Question

7.explain the following:
(a) Why are gaps left in between rails, while
(b) Why are electric transmission lines kept
slightly loose, when they are laid in summer?
(C) Why is the concrete floor made in small slabs, rather than a single block?
(d) Why are iron bridges mounted on steel
rollers?
(e) Why is a small gap left behind the walls while
mounting a girder for roofing?​

Answer 1

Answer:

hey we to yes food do we on to is

Answer 2

Answer:

because they need to expand and contract in summer and winters

Explanation:

for all the question the same answer ....