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Q85 (NDA-I/2012) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

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

Result
Your answer: —  Â·  Correct: D
Explanation

Magnets, specifically electromagnets and permanent magnets, are essential components in various household appliances. In a calling bell (electric bell), an electromagnet is used to pull a clapper against a gong to produce sound [1]. Fans and washing machines rely on electric motors to function [1]. These motors operate through the interaction of magnetic fields, often utilizing electromagnets or permanent magnets to convert electrical energy into mechanical motion. Specifically, in a washing machine, motors drive the drum, while in fans, they rotate the blades. While some appliances like heaters and irons rely on the heating effect of current [2], devices involving motion or sound signaling typically require magnets as a core functional element [1]. Therefore, magnets are essential parts of calling bells, fans, and washing machines, making 'All of the above' the correct choice.

Sources

  1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 4: Electricity: Magnetic and Heating Effects > Be a scientist > p. 49
  2. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 4: Electricity: Magnetic and Heating Effects > Think like a scientist > p. 53
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