Question

A beaker is completely filled with water at $4^o\text{C}.$ It will overflow if

• A. Heated above $4^{\circ }\text{C}$
• B. Cooled below $4^{\circ }\text{C}$
• C. Both heated and cooled above and below $4^{\circ }\text{C},$ respectively
• D. None of these

Answer 1

The correct option is C Both heated and cooled above and below $4^{\circ }\text{C},$ respectively

Water has maximum density at $4^{\circ }\text{C},$ so if the water is heated above $4^{\circ }\text{C}$ or cooled below $4^{\circ }\text{C}$ density decreases i.e., volume increases. In other words, it expands so it overflows in both the cases.
Curve between density of water and temperature.