Analog Electronics
Colpitts oscillator is also called as

 Resonant circuit oscillator
 Tank circuit oscillator
 LC oscillator
All of these

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Analog Electronics
A working diode must have

 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased

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