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# Logic Gates – 1 – 2

6. Which of the Boolean expression correctly represents the relation between P,Q,R and M ?

(a) M = (P OR Q) XOR R
(b) M = (P AND Q) XOR R
(c) M = (P NOR Q) XOR R
(d) M = (P XOR Q) XOR R

Explanation
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7. A lamp is controlled from two position A and B (e.g., stair case circuit). The Boolean expression for the above circuit is :

(a) AB’+A’B
(b) AB+A’B’
(c) A’B+A’B’
(d) AB’+AB

Explanation
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8. In all NAND combination circuit realization all ODD number of gates behave like :

(a) NAND gates
(b) AND gates
(c) OR gates
(d) None of these

Explanation
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9. If the negative logic is used, the diode gate in the circuit below represents an :

(a) OR gate
(b) AND gate
(c) NOR gate
(d) NAND gate

Explanation
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10. A NAND gate is called a universal logic element because :

(a) It is used by everybody
(b) Any logic function can be realized by NAND gates alone
(c) All the minization techniques are applicable for optimum NAND gate realization
(d) Many digital computers use NAND gates