Question

B. Statements given below are incorrect. Writethe correct statements :
1. The increase in area of a solid when heated,is called cubical expansion.
2. On heating, the bimetallic strip (brass and iron) bends in such a way that the brass is
on the inner side while iron is on outer side of the bend.
3. To avoid derailment of train, the rails arefixed tightly, leaving no space for expansion or contraction.
4. The girders supporting the bridge are fixed.
in the walls of the pillars.
5. The metallic wires contract during summer
and can break.​

Answer 1

Answer:

d) none of the above is true−it is not yet known why heat causes expansion.  On heating, the movement of molecules increases; this increases the average A bimetallic strip consists of two metal strips, one of iron and the other of brass,

Explanation: