question_answer

A beaker is completely filled with water at 4°C. It will overflow if               [EAMCET 1992; BHU 1994; AFMC 2005]

A)            Heated above 4°C

B)            Cooled below 4°C

C)            Both heated and cooled above and below 4°C respectively

D) None of the above

Correct Answer: C

Solution :

                   Water has maximum density at 4°C, so if the water is heated above 4°C or cooled below 4°C density decreases i.e. volume increases. In other words, it expands so it overflows in both the cases.