Analog Electronics
The expression for frequency of oscillations of a RC phase shift oscillator is

 f = 1 / (2π RC√6)
 f = 1 / (2π√RC)
None of these
 f = 1 / (2π√R(C1 + C2))

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Analog Electronics
A working diode must have

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

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