MCQ
Bonds in semiconductors are :
- Aionic
- Bmetallic
- CVan der Waals
- ✓covalent
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The combination of gates shown below produces

| (a) AND gate | (b) XOR gate | (c) NOR gate | (d) NAND gate |
A man wearing glasses of focal length +1m cannot clearly see beyond 1m:
A person can see clearly only upto a distance of 25 cm. He wants to read a book placed at a distance of 50 cm. What kind of lens does he require for his spectacles and what must be its power
|
(a) Concave, – 1.0 D |
(b) Convex, + 1.5 D |
(c) Concave, – 2.0 D |
(d) Convex, + 2.0 D |