Question

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

• A. heated above $4^{\circ} C$
• B. cooled below $4^{\circ} C$
• C. both heated and cooled above and below $4^{\circ} C$ respectively
• D. none of the above

Answer 1

Answer: (C)

both heated and cooled above and below $4^{\circ} C$ respectively

Answer 2

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