Question

Which one of the following statements with regard to expansion of materials due to heating is not correct?

• A. As ice melts, it expands uniformly up to $4^{\circ }C$.
• B. Mercury thermometer works using the principle of expansion due to heating.
• C. Small gap is kept between two rails to allow for expansion due to heating.
• D. The length of metallic wire increases when its temperature is increased.

Answer 1

The correct option is A As ice melts, it expands uniformly up to $4^{\circ }C$.

Ice occupies more volume than water having same mass. Thus as ice melts, it contracts up to $4^{o}C$, after that it starts to expand.
Thus statement A is false.