The coil in a heater is made of

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Q: 4 (CDS-I/2010)
The coil in a heater is made of

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,28,26,28,17,8,1

keywords: 

{'coil': [0, 0, 1, 1], 'copper': [1, 0, 1, 1], 'heater': [0, 0, 2, 1], 'iron': [0, 0, 1, 1], 'nichrome': [0, 1, 1, 1]}

The correct answer to the question is option 1: nichrome.

Nichrome is a type of resistance wire that is commonly used for heating elements in heaters. It is an alloy made of nickel and chromium.

Option 2, tungsten, is also a heat-resistant metal that is used in certain types of heating elements, such as incandescent light bulbs. However, it is less commonly used in heaters compared to nichrome.

Option 3, copper, is a good conductor of electricity and heat, but it does not have the high resistance required for heating elements in heaters.

Option 4, iron, is a ferromagnetic metal that is mainly used for its magnetic properties. It is not commonly used as a heating element in heaters.

Overall, the correct answer is option 1 because nichrome is specifically designed to provide the high resistance needed for heating elements in heaters.