1. In full wave rectifier, input a.c. current has a frequency v. The output frequency of current is :

2. Winch of the following gate is not an universal gate?

3. Zener diode is used for:

4. In semi conductor, at room temperature :

5. Crystal diode is:

6. The part of a transistor which is heavily doped to produce a large number of majority carriers is :

7. A p-type semiconductor is:

8. The material most commonly used to manufacture electronic solid state devices is :

9. What is the number of possible crystal systems?

10. A forward biased diode is: