Q81. What is the binary representation of the decimal number 15?
a) 1111
b) 1010
c) 1001
d) 1101
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Correct Answer: a) 1111
Explanation: The decimal number 15 is represented as 1111 in binary. Each binary digit represents a power of 2, and 1111 equals (12^3) + (12^2) + (12^1) + (12^0) = 15.
Q82. Which character encoding standard is commonly used to represent text in computers and the internet?
a) MP4
b) ASCII
c) JPEG
d) MPEG
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Correct Answer: b) ASCII
Explanation: ASCII (American Standard Code for Information Interchange) is a widely used character encoding standard that represents text in computers and the internet, using numerical codes for each character.
Q83. What is the octal equivalent of the binary number 101011?
a) 53
b) 25
c) 52
d) 33
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Correct Answer: c) 52
Explanation: The binary number 101011 is equivalent to 52 in octal. Octal is a base-8 numbering system, and binary digits are grouped in sets of three to convert to octal.
Q84. How many bits are in a nibble?
a) 2
b) 4
c) 8
d) 16
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Correct Answer: b) 4
Explanation: A nibble consists of 4 bits. It is half of a byte and can represent 16 different values (2^4).
Q85. What is the hexadecimal representation of the binary number 1101?
a) A
b) B
c) D
d) F
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Correct Answer: c) D
Explanation: The binary number 1101 is equivalent to the hexadecimal digit “D.” Hexadecimal is a base-16 numbering system, and “D” corresponds to the decimal number 13.
Q86. In computing, which number system is most commonly used for data storage and processing?
a) Decimal
b) Binary
c) Hexadecimal
d) Octal
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Correct Answer: b) Binary
Explanation: The binary number system, which uses only two digits (0 and 1), is the most commonly used system in computing for data storage, processing, and communication.
Q87. What is the decimal equivalent of the binary number 1001?
a) 7
b) 9
c) 11
d) 13
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Correct Answer: b) 9
Explanation: The binary number 1001 is equivalent to the decimal number 9. It is calculated as (12^3) + (02^2) + (02^1) + (12^0) = 8 + 0 + 0 + 1 = 9.
Q88. Which of the following is a valid binary number?
a) 1021
b) 0101
c) 1234
d) 5678
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Correct Answer: b) 0101
Explanation: 0101 is a valid binary number as it only contains the digits 0 and 1. The other options contain digits not allowed in binary representation.
Q89. How many different values can be represented by a byte?
a) 16
b) 128
c) 256
d) 512
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Correct Answer: c) 256
Explanation: A byte, consisting of 8 bits, can represent 256 different values (2^8 = 256), ranging from 0 to 255 in decimal notation.
Q90. What is the primary advantage of using hexadecimal notation in computing?
a) Easier to understand than binary
b) Requires fewer digits to represent large numbers
c) Directly readable by computers
d) Can only represent numbers
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Correct Answer: b) Requires fewer digits to represent large numbers
Explanation: Hexadecimal notation is advantageous because it can represent large numbers using fewer digits compared to binary, making it more compact and easier for humans to read.