1.

At room temperature (30^(@)C) a student sets up an apparatus to determine the melting point of ice. He takes a beater half filled with ice and dips a mercury thermometer in it. The correct observation is……………………

Answer»

mercury in the thermometer KEEPS on falling till it reads `-1^(@)C`. it remains CONSTAT thereafter.
TEMPERATURE falls, reached `0^(@)C`, then it remains constnat even after the whole of the ice has melted.
temperature falls, REACHES `0^(@)C` and remains constnat only as long as both ice and WATER present in it.
temperature falls in the beginning but start rising as soon as the ice starts melting.

Answer :C


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