Which type/types of pen uses/ use capillary action in addition to gravity for flow of ink ?

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Q: 71 (CDS-I/2013)
Which type/types of pen uses/ use capillary action in addition to gravity for flow of ink ?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,71,41,71,13,4,24

keywords: 

{'fountain pen': [0, 0, 0, 1], 'capillary action': [1, 0, 0, 0], 'ballpoint pen': [0, 0, 0, 1], 'gel pen': [0, 0, 0, 1], 'pen': [0, 0, 0, 1], 'cel pen': [0, 0, 0, 1], 'ink': [0, 1, 0, 3], 'types': [11, 3, 20, 23], 'gravity': [0, 0, 0, 6], 'flow': [0, 0, 1, 0]}

The correct answer is option 1: Fountain pen.

Explanation:

- Capillary action is the ability of a liquid to flow in narrow spaces or against gravity due to the cohesive and adhesive properties of the liquid and the surface tension.

- In a fountain pen, capillary action is used in addition to gravity for the flow of ink.

- The ink reservoir in a fountain pen contains ink that is drawn into the nib through capillary action.

- The nib of a fountain pen is designed with a thin slit that allows the ink to flow onto the paper when pressure is applied.

- The capillary action in a fountain pen helps to regulate the flow of ink and prevents it from flooding the paper.

None of the other options use capillary action:

- Ballpoint pens use a different mechanism where a small ball coated in ink rolls across the paper, relying solely on gravity for the flow of ink (option 2).

- Cel pens do not rely on capillary action or gravity for ink flow. Instead, the ink is stored in a reservoir and pushed onto the paper when pressure is applied (option 3).

- Gel pens also do not use capillary action. They use a pigmented gel-based ink that flows onto the paper when pressure is applied (option 4).

Therefore

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