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

Questions
13. How many cells are there in an n-variable K-map?
• [A] 2n
• [B] 2n+a.
• [C] 2n-a.
• [D] n2

14. How many cells does a 5-variable K-map contains?
• [A] 2
• [B] 4
• [C] 32
• [D] 8

15. Which expression is basically an OR operation of AND operated variables?
• [A] Product of Sums.
• [B] Product of Products.
• [C] Sum of Sums.
• [D] Sum of Products.

16. A.1 =?
• [A] 1
• [B] A
• [C] 0
• [D] A or a.

17. A+0 =?
• [A] 1
• [B] A
• [C] 0
• [D] A or 1 .

18. Which is the commutative property?
• [A] A+B=B+A.
• [B] A+1=1+A.
• [C] B+1=1+B.
• [D] A+B+C=C+B+A.

19. What is the output state of an NOR gate if the inputs are 0 and 0?
• [A] 0
• [B] 1
• [C] 3
• [D] 2

20. By adding inverter to the EX-OR gate we can obtain __________.
• [A] OR
• [B] AND
• [C] EX-NOT.
• [D] EX-NOR.

21. A NOT gate also called as __________.
• [A] convertor
• [B] subtractor
• [C] invertor
• [D] selector

22. A group of 8 cells in K-map is called __________.
• [A] octet
• [B] pair
• [C] triple

• [A] sequential circuits.
• [B] combinational circuits.
• [C] either sequential or combinational circuits.
• [D] linear circuits.

24. The circuit that is used for parallel to serial conversion is ___________.
• [A] decoder
• [B] encoder
• [C] multiplexer
• [D] demultiplexer