11. What is the addition of (-64)10 and (80)10?
- (-64)16
- (16)16
- (110000)2
- (01000000)2
12. What is the Gray code word for the binary number 101011?
- 101011
- 110101
- 011111
- 111110
13. Which of the following is not a valid BCD code?
- 0111 1001
- 0101 1011
- 0100 1000
- 0100 1001
14. The number of bits required to represent an eight-digit decimal number BCD is
- 8
- 16
- 24
- 32
15. An example of a self-complementing code is
- 8421 code
- 7421 code
- excess-3 code
- gray code
16. The ASCII is an input code
- it is a two-bit code
- it is a four-bit code
- it is a seven-bit code
- it is an eight-bit code
17. How many bits are required to represent decimal value from -50 to 50?
- At least seven bits
- At least six bits
- At least eight bits
- At least ten bits
18. The hexadecimal representation of (657)8 is
- D78
- 1AF
- D71
- 32F
19. What is the binary subtraction of 101101 – 001011 =?
- 100010
- 010110
- 110101
- 101100
20. If (110)x = (132)4, then x=?
- 8
- 5
- 4
- 9
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