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?

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]}

The correct answer is option 4: All of the above.

Magnet plays an essential role in all the mentioned household appliances.

In the case of a calling bell, a magnet is used to create an electromagnet. When the doorbell button is pressed, the circuit gets completed, and the electromagnet attracts a metal strip, causing the bell to ring.

In a fan, magnets are used in the motor. The motor has electromagnets that interact with permanent magnets to create the rotational motion required for the fan blades to spin.

In a washing machine, magnets are employed in the motor as well. The motor uses magnets to create the rotating motion needed to agitate the clothes inside the machine.

Therefore, a magnet is an essential part of these household appliances, as it enables the functioning of key components like electromagnets and motors.