1. A semiconductor has ___ valence electrons.
(A) 2 (B)3
(04 (D) 5
2. ൩൭ the energy gap between the conduction band and valence band of a
substance is of the order of 0.7 eV
(A) conductor (B) semiconductor
(C) insulator (D) none of the above
3. Ina Zener regulator, change in load current produces change in പ
(A) Zener current (B) Zener voltage
(©) ^ & 8 (0) None of the above
4. Maximum efficiency of a half wave rectifier is
(A) 50% (B) 25%
(....
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