STLD
FIRST MID JNTUH ONLINE BITS
UNIT-1(Number systems and codes)
Section-I : choose the correct answer
1. The fraction (0.68)10 is equal
to [ ]
a) (0.010101)2 b) (0.101)2 c)
(0.10101)2
d) (0.10111)2
2.
The Hexadecimal number A0 has the decimal value [ ]
a)80 b) 256 c) 100 d) 160
3.
Given two numbers A & B in sign magnitude representation in an eight bit
format A=00011110 & B=10011100, A XOR
B gives [ ]
a)10000010
b) 00011111 c) 10011101 d) 11100001
4.
The value of binary 1111 is [ ]
a) 23-1 b) 24-1 c) 24 d)
none of these
5. The minimum number of bits required to
represent negative numbers in the range of -1 to -11 using 2’s complement
arithmetic is [ ]
(a)2 (b) 3 (c) 4 (d) 5
6. The
following code is not a BCD code. [ ]
a)Gray code (b) Xs-3 code (c) 8421 code (d) All of these
7. A 15-bit
hamming code requires [ ]
(a)4 parity bits
(b) 5 parity bits (c) 15 parity bits (d) 7 parity bits
8.If=5,the
base(radix) of the number system is [ ]
a)5 (b) 6 (c) 7 (d) 8
9. The
hexadecimal number system is used in digital computers and digital systems to [
]
(a) Perform arithmetic operations (b) Perform logic
operations (c) Perform
arithmetic and logic operations (d) Input binary data into the sys
10. Determine the value of base x if : (211)x = (152)8 [ ]
(a) 2 (b) 10 (c) 8
(d) 7
11. Determine the value of base x, if (193)x =
(623)8 [
]
(a)16 (b)4 (c)2
(d)5
12. Which of the following are called Universal
gates [ ]
(a) NAND,NOR (b)
AND,OR (c) XOR XNOR (d) OR,XOR
Section-II: Fill in the blanks
18. Cyclic
codes are also called ________________codes
19. The basic
two types of BCD codes are _______________and________ codes.
20. The
distance between code words 10010 & 10101 is ________.
21. Convert the
binary code (110110)2 to Gray code_____________.
22. Conversion
of 0.1289062 decimal number to its hexa equivalent is ________.
23. In b’s complement method, the carry
is ______ and in(b-1)’s complement method the carry is _______
24. The MSB of a binary number has a
weight of 512,the number consists of _________ bits.
25. __________ are codes which represent
letters of the alphabets and decimal numbers as a sequence of
0s and 1s.
Prepared
by
Srilatha & Sowmya