Q1: In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid

ANS:A - crossover distortion

Crossover distortion is a type of distortion which is caused by switching between devices driving a load, most often when the devices (such as a transistor) are matched. It is most commonly seen in complementary, or "push-pull", Class-B amplifier stages, although it is occasionally seen in other types of circuits as well.