# Two identical tumblers are fully filled with water at a certain temperature . One of the tumbler is warmed up and the other cooled . But it is formed that water overflows from both the tumblers . The temperature at which they are fully filled is

$(a)\;4\;K\qquad(b)\;277\;K\qquad(c)\;277^{0}C\qquad(d)\;277^{0}F$

Answer : $\;277\;K$
Explanation :
$277\;K=4^{0}C$
Water expands when heated above $\;4^{0}C\;$ and also when cooled below $\;4^{0}C\;$ . water has maximum density at $\;4^{0}C$