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21. The maximum number of bits sufficient to represent a hexadecimal number in binary _____.
A. 4
B. 7
C. 3
D. 8
ANSWER:A
SOLUTION : 4 bits are the maximum number of bits sufficient to represent a hexadecimal number in binary Because each hexadecimal digit corresponds to exactly 4 bits (log 2(16) = 4) and each byte is two hexadecimal digits, converting from binary to hexadecimal is fairly simple.
22. Convert (52)16 into its decimal equivalent ______.
A. 28
B. 83
C. 80
D. 82
ANSWER: D
SOLUTION:Convert the hexadecimal number to decimal by multiplying each digit by its corresponding power of \(16\) and adding the results. \((52)_{16}=5\cdot 16^{1}+2\cdot 16^{0}\) \((52)_{16}=5\cdot 16+2\cdot 1\) \((52)_{16}=80+2\) \((52)_{16}=82\)The decimal equivalent of \((52)_{16}\) is \(82\).
23. Convert (6532)8 to hexadecimal _______.
A. (A01)16
B. (A02)16
C. (D5A)16
D. (C01)16
ANSWER:C
SOLUTION:The hexadecimal equivalent of (6532)8 is (D5A)16.
To convert an octal number to a hexadecimal number, we first convert the octal number to a binary number. Then, we group the binary digits into groups of four, starting from the right. Each group of four binary digits represents a hexadecimal digit.
The binary equivalent of (6532)8 is 1101 0101 0011 0110. Grouping the binary digits into groups of four, we get 1101 0101 0011 0110. The hexadecimal digits corresponding to these groups are D, 5, A, and E. Therefore, the hexadecimal equivalent of (6532)8 is (D5AE)16.
24. Which of the following is not a type of computer code?
A. EBCDIC
B. BCD
C. ASCII
D. EDIC
ANSWER:D
SOLUTION:There is no coding scheme like EDIC. EBCDIC stands for Extended Binary Coded Decimal Interchange Code. BCD stands for Binary Coded Decimal.
25. What does EBCDIC stand for?
A. Extended Binary Converted Decimal Intermediate Code
B. Extended Binary Coded Decimal Intermediate Code
C. Extended Binary Coded Decimal Interchange Code
D. Extended Binary Converted Decimal Interchange Code
ANSWER:C
SOLUTION:Extended Binary Coded Decimal Interchange Code is an eight-bit character encoding used mainly on IBM mainframe and IBM midrange computer operating systems.
26. What does ASCII stand for?
A. American Standard Code for Information Interchange
B. American Scientific Code for Information Interchange
C. American Scientific Code for Interchanging Information
D. American Standard Code for Interchanging Information
ANSWER: A
SOLUTION:ASCII (American Standard Code for Information Interchange) is the most common character encoding format for text data in computers and on the internet.
27. Which of the following is a valid encoding format?
A. UTF-1
B. UTF-8
C. UTF-A
D. UTF-4
ANSWER: B
SOLUTION: UTF-8 is a valid encoding format. It is the most widely used way to represent Unicode text in web pages, accounting for 98.2% of all web pages as of 2024. UTF-8 is an encoding standard that translates numbers into binary.
28. The octal system______.
A. Needs less digits to represent a number that in the binary system
B. Needs more digits to represent a number the binary system
C. Needs the same number of digits to represent a number as in the binary system
D. Needs the same number of digits to represent a number as in the decimal system
ANSWER:B
SOLUTION: Needs more digits to represent a number the binary system
29. Decimal equivalent of (1111)2 is ___________.
A. 11
B. 10
C. 15
D. 13
ANSWER: C
SOLUTION:1510 is the equivalent decimal system representation for the binary number 11112.