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

4 K

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277 K

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277^{0}

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- 277^{0}

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Solution

The correct option is B 277 K
Water has anomalous expansion from $4^{0}$ C( $277^{0}$ K) to $0^{0}$ C( $273^{0}$ K).
Water expands when heated from $4^{0}$ C( $277^{0}$ K) onwards.
Since water overflows both the tumblers, the temp at which they are fully filled is $277^{0}$ K

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