Q.1. Main Gate (Baisc Gate) is
(A) AND, OR
(B) NAND, NOR
(C) OR, NOT
(D) AND, OR, NOT
Ans :- (D)
Q.2. Write the decimal number 25 in binary
(A) (1100)₂
(B) (1001)₂
(C) (11001)₂
(D) (11101)₂
Ans :- (C)
Q.3. How many transistor are used for NOT – gate ?
(A) 1
(B) 3
(C) 2
(D) None of these
Ans :- (A)
Q.4. Write the crease of temperature, the resistance of a semiconductor
(A) increases
(B) decreases
(C) sometime increases and sometime decreases
(D) remains unchanged
Ans :- (B)
Q.5. How many semiconductor diodes are used for OR-gate ?
(A) 2
(B) 3
(C) 1
(D) None of these
Ans :- (A)
Q.6. Which of the following are the universal gate
(A) NOR- gate
(B) NAND- gate
(C) AND- gate
(D) Both ‘A’ and ‘B’
Ans :- (D)
Q.7. If the current constant for a transistor are α and β then
(A) αβ = 1
(B) β>1 , α<1
(C) α=β
(D) β<1 ,α>1
Ans :- (B)
Q.8. Which of the following logic gate is a universal gates ?
(A) OR- gate
(B) NOR- gate
(C) AND- gate
(D) NOT- gate
Ans :- (B)
Q.9. A semiconductor is cooled from T₁K to T₂K then its resistance will
(A) increase
(B) decrease
(C) remain constant
(D) first decrease then increase
Ans :- (B)
Q.10. Which of the following gate not contains transistor
(A) NOR- gate
(B) AND- gate
(C) NOT- gate
(D) None of these
Ans :- (B)
Q.11. How many semiconductor diodes are used for AND- gate ?
(A) 1
(B) 3
(C) 2
(D) 4
Ans :- (C)
Q.12. For a transistor β is 24, the value of α is
(A) 1
(B) 0.96
(C) 0.50
(D) 0.25
Ans :- (B)
Q.13. In n-p-n transistor the relation between emitter current iE , base current iB , and collector current iC , is
(A) Ic = Ie – Ib
(B) Ib = Ie + Ic
(C) Ie = Ic + Ib
(D) None of these
Ans :- (C)
Q.14. At absolute zero, Si acts as
(A) Non- metal
(B) Metal
(C) Insulator
(D) None of these
Ans :- (C)
Q.15. Transistor is a/an
(A) Chip
(B) insulator
(C) Semiconductor
(D) metal
Ans :- (C)
Q.16. Transistor are made of
(A) Copper
(B) Sillicon
(C) aluminium
(D) Constantan
Ans :- (B)
Q.17. Drift current in a p-n junction is due to
(A) electric field
(B) Charge carriers density
(C) Collision of electrons
(D) None of the above
Ans :- (B)
Q.18. The ratio of power gain and resistance in case of common base amplifier is
(A) α
(B) α²
(C) α³
(D) α⁴
Ans :-(B)
Q.19. In boolean algebra if A=B=1 then the value of (A·B+A) is
(A) A
(B) B
(C) A+B
(D) all of above
Ans :- (D)