Which of the following conditions are associated with atmospheric pressure 1 Nose bleeding at high a...........

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Which of the following conditions are associated with atmospheric pressure?

1. Nose bleeding at high altitude.

2. The melted wax of a candle drawn up into the wick.

3. Rise of ink in the tube of a fountain pen when the piston is pulled.

Select the correct answer from the codes given below

1 and 2 only

1 and 3 only

2 and 3 only

All of the above

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Explanation:

Air exerts enormous pressure on living organisms. This pressure is not felt because the blood exerts a slightly higher pressure from inside. At high altitudes where atmospheric pressure is less nose bleeding may occur due to greater pressure of blood.
The melted wax of a candle is drawn up into the wick due to capillarity action and not due to atmospheric pressure.
When the piston is pulled, the atmospheric pressure pushes up the liquid up the tube.