Analog Electronics
The most commonly used amplifier in sample & hold circuits is

A unity gain non-inverting amplifier
A unity gain inverting amplifier
An inverting amplifiers with a gain of 100
An inverting amplifier with a gain of 10

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Analog Electronics
A working diode must have

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

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