9. In the diagram, the input is across the terminals A and C and the output is across B and D. Then the output is ?

8. A piece of copper and other of germanium are cooled from the room temperature to 80 K, then ?

7. Diamond is very hard because ?

6. Which one of the following is the weakest kind of bonding in solids ?

5. For an electronic valve, the plate current I and plate voltage V in the space charge limited region are related as ?

4. The depletion layer in the p−n junction region is caused by ?

3. When n-type semiconductor is heated _ ?

2. p − n junction is said to be forward biased, when ?

1. At absolute zero, Si acts as :