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quiz on 1's and 2's complement, number system conversions.
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QUIZ OF UNIT-12BCA
DIGITAL ELECTRONICS
Q1: 1’S COMPLEMENT OF 101101
A. 010010
B. 010011
The correct answer is: A(010010)
Q2: 2’S COMPLEMENT OF 0101101
A. 1010010
B. 1010011
The correct answer is: B(1010011)
Q3: PRODUCT OF TWO BINARY NUMBERS 0101 AND 0110 IS:
A. 11110
B. 11101
The correct answer is: A(11110){0101=5 and 0110=6,5x6=30 and 30 in binary=11110}
Q4:OCTAL EQUIVALENT OF 101101 IS:
A. (55)8
B. (15)8
The correct answer is: (55)8
Q5: 1’S AND 2’S COMPLEMENT OF 110010111A. (001101111) and (001101000)
B. (001101000) and (001101001)
The correct answer is: (001101000) and (001101001)
Q6: Binary equivalent of (86)10 is:
A. (1010110)2
B. (1001100)2
The correct ans is: (1010110)2
Q6: BCD ADDITION OF 56 AND 21 IS:
A. (01110111)2
B. (1001101)2
The correct ans is: A (01110111)2
56 IN BCD=0101 0110 AND 21 IN BCD=0010 0001(56+21=77)=>77 IN BCD =01110111
Q7: Octal and Hexadecimal equivalent of (10101101010)2
A. (1552)8 and (19A)16
B. (2552)8 and (56A)16
The correct answer is: (2552)8 and (56A)16
Q8: BCD equivalent code of (589)10
A. (010110001001)
B. (011001111001)
The correct answer is: A (010110001001) {In BCD code, we write 4 bit binary equivalent of each
digit, so 5=0101,8=1000,9=1001}
Q9: SUM OF 15 AND 24 IN BINARY
A. (0001101)
B. (100111)
The correct answer is: B (100111) {15+24=39, 39 in binary=100111}
Q:Find excess-3 code for the decimal number 564
A. 100010010111B. 100101100100
The correct answer is A(100010010111) {5+3=8=1000,6+3=9=1001,4+3=7=0111=>564
=100010010111}
Q10: (101)2 X (1010)2 is:
A. (110010)
B. (100101)
The correct answer is: A (110010) {101=5 and 1010=10, 5*10=50, 50 in
binary=110010}
Q11 Number of 1’s present in the binary equivalent of 5x5 is:
A. 2
B. 3
The correct answer is: B(3) {5x5=25, 25 in binary=11001 so total no of 1’s =3}
Q: Find the decimal equivalent of excess-3 code 110010010101.1100
A. (962.9)
B. (965.5)
The correct answer is: A(962.9){1100=12-3=9,
1001=9-3=6 ,
0101=5-3=2
1100=12-3=9}
Q12: Hexadecimal equivalent of (86)10
A. (56)16
B. (9A)16
The correct answer is: (56)16
Q13: what is the binary equivalent of Gray code 11100?A. (01011)
B. (10111)
The correct answer is: B (10111) {gray code retain first bit but takes X-OR of
consecutive bits of given binary value 1 SAME,0 1=1,1 0=1,1 1=0,1 1=0}++ + +
Q13:Total number of 1’s in the 2’s complement of 11000100
A. 4
B. 5
The correct answer is: A (4) {2’S COMPLEMENT OF 11000100=00111100}
Q14: Binary representation of hexadecimal number (125)16 IS:
A. (0000000111011010)2
B. (0000000100100101)2
The correct answer is: B (0000000100100101)2