A bimetallic strip is made of aluminium and steel . On heating, the strip will
a) remain straight
b) get twisted
c) will bend with aluminium on the concave side
d) will bend with steel on the concave side
The answer is the option (d) Will bend with steel on the concave side.
Explanation: Initially, Aluminium and Steel are fixed together in a bimetallic strip and when you heat them, the expansion in steel will be smaller than the expansion in aluminium. Hence, the steel strip will be on the concave side, whereas the aluminium strip will be on the convex side.