Digital Computer Fundamentals - Questions & Answers for Competitive Exams | GkSeries

1. Which of the following binary numbers is equivalent to decimal 13?

• [A] 1000
• [B] 1101
• [C] 1101
• [D] 1001

Answer: Option [B]

2. What is the octal equivalent of the binary number 10111101?

• [A] 675.
• [B] 275.
• [C] 572
• [D] 573

Answer: Option [B]

3. What is the output state of an OR gate if the inputs are 0 and 1?

• [A] 0
• [B] 1
• [C] not defined.
• [D] 2

Answer: Option [B]

4. An OR gate has _________.

• [A] two inputs and one output.
• [B] one input and one output.
• [C] one input and two outputs.
• [D] one input and three outputs.

Answer: Option [A]

5. The output of a _________ gate is only 1 when all of its inputs are 1.

• [A] NOR
• [B] XOR
• [C] AND
• [D] NOT

Answer: Option [C]

6. A NAND gate is equivalent to an AND gate plus a __________ gate put together.

• [A] NOR
• [B] NOT
• [C] XOR
• [D] XNOR

Answer: Option [B]

7. An AND gate will function as OR if ___________.

• [A] all the inputs to the gates are 1.
• [B] all the inputs are 0.
• [C] either of the inputs is 1.
• [D] all the inputs and outputs are complemented.

Answer: Option [D]

8. By adding inverters to the inputs and output of a AND gate we can obtain ______.

• [A] OR
• [B] AND
• [C] NOT
• [D] X-OR .

Answer: Option [D]

9. Boolean Algebra obeys _________.

• [A] commutative law.
• [B] associative law.
• [C] distributive law.
• [D] commutative, associative, distributive law.

Answer: Option [D]

10. A+(B.C) =?

• [A] A.B+C
• [B] A.B+A.C
• [C] A
• [D] (A+B).(A+C)

Answer: Option [D]

11. In which function each term known as min term.

• [A] SOP
• [B] POS
• [C] Hybrid
• [D] Both SOP and POS

Answer: Option [A]

12. In which function each term known as max term.

• [A] SOP
• [B] POS
• [C] Hybrid
• [D] Both SOP and Hybrid.

Answer: Option [B]