Q.1 What is the smallest unit of data in a computer?
Byte
Bit
Nibble
Word
Explanation - A bit (binary digit) is the smallest unit of data and can have a value of 0 or 1.
Correct answer is: Bit
Q.2 How many bits are there in a byte?
4
8
16
32
Explanation - A byte consists of 8 bits.
Correct answer is: 8
Q.3 Which of the following is used to represent negative numbers in binary?
Sign-magnitude
1's complement
2's complement
All of the above
Explanation - Sign-magnitude, 1's complement, and 2's complement are all methods to represent negative numbers in binary.
Correct answer is: All of the above
Q.4 A nibble consists of how many bits?
2
4
6
8
Explanation - A nibble is half a byte and consists of 4 bits.
Correct answer is: 4
Q.5 Which numbering system is base 16?
Decimal
Binary
Octal
Hexadecimal
Explanation - Hexadecimal numbering system is base 16, using digits 0-9 and letters A-F.
Correct answer is: Hexadecimal
Q.6 What is the decimal equivalent of binary 1011?
10
11
12
13
Explanation - Binary 1011 = (1×2³ + 0×2² + 1×2¹ + 1×2⁰) = 8 + 0 + 2 + 1 = 11 in decimal.
Correct answer is: 11
Q.7 Which data type is commonly used to store a single character?
Integer
Float
Char
Boolean
Explanation - A 'Char' data type is used to store a single character, typically using 1 byte.
Correct answer is: Char
Q.8 What is the binary representation of decimal number 5?
101
110
111
100
Explanation - Decimal 5 = 1×2² + 0×2¹ + 1×2⁰ = 101 in binary.
Correct answer is: 101
Q.9 Which storage device is considered volatile memory?
Hard Disk
ROM
RAM
Flash Memory
Explanation - RAM is volatile memory, which loses its data when power is turned off.
Correct answer is: RAM
Q.10 ASCII is used for which type of data representation?
Images
Text
Audio
Video
Explanation - ASCII (American Standard Code for Information Interchange) encodes textual characters into binary numbers.
Correct answer is: Text
Q.11 How many bytes are in a kilobyte (KB)?
512
1024
1000
2048
Explanation - 1 KB = 1024 bytes (2¹⁰ bytes).
Correct answer is: 1024
Q.12 Which of the following represents unsigned binary numbers?
Numbers with a sign bit
Only positive numbers
Negative numbers only
Decimal numbers
Explanation - Unsigned binary numbers can represent only non-negative values (0 and positive integers).
Correct answer is: Only positive numbers
Q.13 Floating point numbers are used to represent which type of numbers?
Integers
Decimal numbers
Characters
Binary digits
Explanation - Floating point representation is used to store real numbers with fractional parts.
Correct answer is: Decimal numbers
Q.14 Which coding system is used to represent non-text data such as images and audio?
ASCII
BCD
Unicode
Binary data formats
Explanation - Non-text data like images and audio are represented using specific binary data formats.
Correct answer is: Binary data formats
Q.15 What is the main advantage of 2's complement over 1's complement?
Simpler subtraction
Unique zero representation
Smaller memory
Faster multiplication
Explanation - 2's complement has a unique representation for zero, unlike 1's complement which has two zeros.
Correct answer is: Unique zero representation
Q.16 What is the hexadecimal equivalent of binary 110111?
1B
3B
1D
2F
Explanation - Binary 110111 = 6-bit group → split as 0001 1011 = 1B in hexadecimal.
Correct answer is: 1B
Q.17 Which of the following is a non-volatile memory?
RAM
Cache
ROM
Registers
Explanation - ROM retains its data even when the power is turned off, making it non-volatile.
Correct answer is: ROM
Q.18 BCD stands for:
Binary Coded Decimal
Binary Character Data
Basic Code Digit
Bit Control Data
Explanation - BCD represents each decimal digit using its 4-bit binary equivalent.
Correct answer is: Binary Coded Decimal
Q.19 Which data representation method is most commonly used in computers for real numbers?
Integer
Floating point
BCD
ASCII
Explanation - Floating point format allows computers to represent real numbers with fractional parts efficiently.
Correct answer is: Floating point
Q.20 How many bits are used in a standard ASCII code?
7
8
16
32
Explanation - Standard ASCII uses 7 bits to represent 128 characters.
Correct answer is: 7
Q.21 Which of the following is used to represent text in most modern computers?
ASCII
Unicode
EBCDIC
BCD
Explanation - Unicode is widely used to represent text in modern computers, supporting many languages and symbols.
Correct answer is: Unicode
Q.22 The process of converting analog signals to digital form is called:
Digitization
Quantization
Sampling
Encoding
Explanation - Digitization is the process of converting continuous analog signals into discrete digital form.
Correct answer is: Digitization
Q.23 Which of the following memory types is fastest?
RAM
Cache
ROM
Hard Disk
Explanation - Cache memory is the fastest type of memory used to store frequently accessed data for quick retrieval.
Correct answer is: Cache
Q.24 Which binary number represents decimal 0 in 8-bit 2's complement?
00000000
11111111
10000000
01111111
Explanation - In 8-bit 2's complement, 00000000 represents decimal 0.
Correct answer is: 00000000
Q.25 How many distinct values can be represented by 3 bits?
4
6
8
16
Explanation - 3 bits can represent 2³ = 8 distinct values, from 0 to 7.
Correct answer is: 8