Communication Systems
Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is wrong but R is correct
A is correct but R is wrong

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Communication Systems
DVD uses

Laser beam for both recording and playback
None of these
Laser beam for recording and video head for playback
Video head for recording and laser beam for playback

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