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Electronics and Communications


1. 

Which of the following electronic devices is used for digital displays in electronic calculators?

Answer : C. LCDs

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2. 

Given below are two statements, an Assertion (A) and Reason(R ).
Assertion (A) : Transformer is useful for stepping up or stepping down voltages.
Reason(R ): Transformer is a device used in D.C. circuits.

Answer : C. A is true, but R is false

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3. 

Pure silicon is used in

Answer : A. Electronics industry

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4. 

An antenna

Answer : D. converts radio waves into electrical signals and vice versa

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5. 

Analyse the statements and choose the correct answer:
Assertion (A): A particle moves along a circle.
Resertion (R-I ): speed is uniform. (R-II ): Velocity is changing

Answer : D. Both are correct

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6. 

A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct?

Answer : C. It must have a low melting point

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