Question

Railway tracks expand in winters and contract in summers.

• A. True
• B. False

Answer 1

The correct option is B False

1. The property of the substance due to which it expands on heating is called thermal expansion.
2. The expansion of a solid also depends upon temperature.
3. If we increase the temperature of solids, the internal energy of the molecules increases and so is the internal molecular vibration.
4. Hence, there is a linear expansion of the solid.
5. In summer temperature increases and hence railway tracks expand.
6. While in winter, temperature decreases and hence railway tracks contract.
   Hence, the given statement is false.