Q31. In computing, how is data typically represented?
a) Decimal system
b) Hexadecimal system
c) Binary system
d) Octal system
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Correct Answer: c) Binary system
Explanation: In computing, data is typically represented in the binary system, which uses two symbols, 0 and 1, to represent all data. Binary is the base-2 numeral system used by digital devices.
Q32. What does the term “bit” stand for?
a) Binary Information Transfer
b) Binary Integer
c) Binary Digit
d) Binary Technology
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Correct Answer: c) Binary Digit
Explanation: A “bit” stands for “binary digit,” which is the smallest unit of data in a computer. A bit can represent either a 0 or a 1 in the binary system.
Q33. How many bits make up a byte?
a) 4
b) 8
c) 16
d) 32
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Correct Answer: b) 8
Explanation: A byte is composed of 8 bits. It is a standard unit of data used in computing to represent a single character, such as a letter or a number.
Q34. What is the hexadecimal equivalent of the binary number 1010?
a) 5
b) A
c) F
d) 10
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Correct Answer: b) A
Explanation: The binary number 1010 is equivalent to the decimal number 10, which corresponds to the hexadecimal digit “A.” Hexadecimal is a base-16 numeral system.
Q35. Which of the following is a method of encoding text in computers?
a) JPEG
b) ASCII
c) MP3
d) MPEG
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Correct Answer: b) ASCII
Explanation: ASCII (American Standard Code for Information Interchange) is a character encoding standard used to represent text in computers and other devices that use text. Each character is assigned a unique numerical code.
Q36. How many bytes are in a kilobyte (KB) in the binary system?
a) 1000
b) 1024
c) 2048
d) 512
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Correct Answer: b) 1024
Explanation: In the binary system, 1 kilobyte (KB) is equal to 1024 bytes. This is because binary counting is based on powers of 2, and 2^10 equals 1024.
Q37. What is the binary equivalent of the decimal number 9?
a) 1001
b) 1010
c) 1100
d) 1111
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Correct Answer: a) 1001
Explanation: The decimal number 9 is represented as 1001 in binary. Each position in a binary number represents a power of 2, with the rightmost position being 2^0.
Q38. Which of the following is NOT a binary number?
a) 1010
b) 1101
c) 2020
d) 0110
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Correct Answer: c) 2020
Explanation: 2020 is not a binary number because it contains the digit “2,” which is not allowed in the binary system. Binary numbers only use the digits 0 and 1.
Q39. How is the number 255 represented in hexadecimal?
a) FF
b) EE
c) DD
d) CC
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Correct Answer: a) FF
Explanation: The decimal number 255 is represented as “FF” in hexadecimal. Each hexadecimal digit represents a value between 0 and 15 in the decimal system, with “F” representing 15.
Q40. What is the purpose of data representation in computing?
a) To simplify user interfaces
b) To enhance software performance
c) To store and manipulate information in a form that computers can process
d) To reduce file sizes
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Correct Answer: c) To store and manipulate information in a form that computers can process
Explanation: Data representation in computing is essential for storing, processing, and manipulating information in a way that computers can understand and efficiently handle.