Question

why one end of the iron grides is placed on rollers in construction of bridges

Answer 1

Answer:

idk to stringhtining

Explanation:

Answer 2

$\huge\boxed{\displaystyle \rm \red {Answer:}}$

When we have rollers at one end then it is allowed to expand freely without any thermal stress.in summers the bridges may expand due to the increase in the temperature and in winters the bridges may compress due to decrease in the temperature.