Q.

Which of these do not use a magnet?


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a

LCD TV

b

Electric fan

c

Computer and Hard disk

d

DVD 

answer is A.

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Detailed Solution

LCD TVs do not use a magnet.
Those objects which are attracted by a magnet are known as magnetic materials. On the other hand, objects which are not attracted by a magnet are known as non-magnetic materials.
Most LCD TVs use liquid pixels to form images. The full form of LCD is a Liquid crystal display. It consumes very less electricity as compared to a plasma TV. It is made by assembling a sandwich of two sheets of polarizing materials.
 
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Which of these do not use a magnet?