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 ?
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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]}