For which among the following house appliances, magnet is an essential part?

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Q: 85 (NDA-I/2012)
For which among the following house appliances, magnet is an essential part?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,13,7,4,0,3,13

keywords: 

{'house appliances': [0, 0, 0, 1], 'magnet': [0, 0, 2, 6], 'washing machine': [0, 1, 0, 0], 'essential part': [1, 0, 0, 1], 'bell': [1, 0, 1, 1], 'fan': [0, 0, 2, 1]}