Short notes
Objective questions (Answers are given below)
- The digital systems usually operate on ……..system.
(a) binary (b) decimal
(c) octal (d) hexadecimal. - The binary system uses powers of ……..for positional
values.
(a) 2 (b) 10
(c) 8 (d) 16 - After counting 0, 1, 10, 11, the next binary number
is
(a) 12 (b) 100
(c) 101 (d) 110. - The number 10002 is equivalent to decimal
number
(a) one thousand
(b) eight (c) four
(d) sixteen. - In binary numbers, shifting the binary point one
place to the right.
(a) multiplies by 2 (b) divides by 2
(c) decreases by 10 (d) increases by 10. - The binary addition 1 + 1 + 1 gives
(a) 111 (b) 10
(c) 110 (d) 11 - The cumulative addition of the four binary bits
( 1 + 1 + 1 + 1) gives
(a) 1111 (b) 111
(c) 100 (d) 1001 - The result of binary subtraction (100 − 011) is
(a) −111 (b) 111
(c) 011 (d) 001. - The 2’s complement of 10002 is
(a) 0111 (b) 0101
(c) 1000 (d) 0001 - The chief reason why digital computers use
complemental subtraction is that it
(a) simplifies their circuitry
(b) is a very simple process
(c) can handle negative numbers easily
(d) avoids direct subtraction. - The result of binary multiplication 1112 × 102
is
(a) 1101 (b) 0110
(c) 1001 (d) 1110 - The binary division 110002 ÷ 1002 gives
(a) 110 (b) 1100
(c) 11 (d) 101 - The number 128 is equivalent to decimal
(a) 12 (b) 20
(c) 10 (d) 4 - The number 1001012 is equivalent to octal
(a) 54 (b) 45
(c) 37 (d) 25. - The number 178 is equivalent to binary
(a) 111 (b) 1110
(c) 10000 (d) 1111. - Which of the following is NOT an octal number
?
(a) 19 (b) 77
(c) 15 (d) 101 - Hexadecimal number system is used as a shorthand
language for representing …….numbers.
(a) decimal (b) binary
(c) octal (d) large - The binary equivalent of A16 is
(a) 1010 (b) 1011
(c) 1000 (d) 1110. - BCD code is
(a) non-weighted
(b) the same thing as binary numbers
(c) a binary code
(d) an alphanumeric code. - Which of the following 4-bit combinations is/
are invalid in the BCD code ?
(a) 1010 (b) 0010
(c) 0101 (d) 1000.
- Octal coding involves grouping the bits in
(a) 5’s (b) 7’s
(c) 4’s (d) 3’s. - In Excess-3 code each coded number is
…….than in BCD code.
(a) four larger (b) three smaller
(c) three larger (d) much larger. - Which numbering system uses numbers and
letters as symbols ?
(a) decimal (b) binary
(c) octal (d) hexadecimal - To convert a whole decimal number into a
hexadecimal equivalent, one should divide the
decimal value by…….
(a) 2 (b) 8
(c) 10 (d) 16.
- (a) 2. (a) 3. (b) 4. (b) 5. (a) 6. (d) 7. (b) 8. (d) 9. (c) 10. (a) 11.(d) 12. (a) 13. (c) 14. (b) 15. (d) 16. (a) 17. (a) 18. (a) 19. (c) 20. (a) 19.(d) 22. (c) 23. (d) 24. (a)
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