Multiple choice

Consider the following statements:

  1. A body will weigh less in air than in vacuum, when weighed with a spring balance.
  2. When a barometer is taken to a mine, the height of mercury column increases.

Which of the given statements is/are correct?

  1. Only (1)

  2. Only (2)

  3. Both (1) & (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(i) Statement (1) is correct. Body will weigh more in vacuum as there is no up thrust in vacuum. In air, the air column offers an up thrust and so there is an apparent loss of weight when weighed in air. (ii) Statement (2) is correct. When a barometer is taken to a mine the pressure increases. In a mine, the gases present are denser so the pressure is more. Hence, the height of mercury column increases.

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