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Direction: Choose the correct alternative from the following options as given below for the Assertion (A) and Reason (R) given in each of the questions.

  1. Assertion (A)
    Alcohol rather than mercury is used in a thermometer to measure a temperature of - 60 C.
    Reason (R)
    Alcohol has a lower freezing point than mercury.
    1. if both A and R are true and R is the correct explanation of A
    2. if both A and R are true and R is not the correct explanation of A
    3. if A is true but R is false
    4. if A is true but R is true
Correct Option: A

We know that, mercury freezes at -39 C, while alcohol freezes at a point far below - 100 C. So, alcohol is used to measure lower temperatures. Similarly, mercury boils at 357 C, while alcohol boils at 78 C. So, mercury is used to measure high temperature.



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