Assertion (A): Diamond and carborudum are both very hard materials.

Reason (R): Valence band can be extremely strong.

Match the following:

1. Tellegen's theorem is applicable to any lumped networks.
2. The reciprocity theorem is applicable to linear bilateral networks.
3. Thevenin's theorem is applicable to two- terminal linear active networks.
4. Norton's theorem is applicable to two-terminal linear active networks.

1. To increase gain for weak signals
2. To decrease gain for strong signals
3. To change the contrast when we switch from one channel to other
4. To reduce flutter

Match the following: