Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
4951
The Associative Law of Boolean algebra states that:
Answer:
A + (B + C) = (A + B) + C
The associative law says that the grouping of variables in a series of OR operations (or AND operations) does not matter.
4952
What is the decimal equivalent of the octal number (23)₈?
Answer:
19
(2 \* 8¹) + (3 \* 8⁰) = 16 + 3 = 19.
4953
Which gate's output is represented by the Boolean expression (A+B)'?
Answer:
NOR
The expression A+B represents an OR gate. The prime symbol (') represents a NOT operation. Therefore, (A+B)' is a NOT OR, or NOR gate.
4954
What is the binary representation of the decimal number 255?
Answer:
(11111111)₂
255 is equal to 2⁸ - 1, which in binary is a string of eight 1s. (128 + 64 + 32 + 16 + 8 + 4 + 2 + 1 = 255).
4955
UTF-8 is a popular encoding for which character set?
Answer:
Unicode
UTF-8 (Unicode Transformation Format - 8-bit) is the most common method for encoding Unicode characters. It is a variable-width encoding that is backward-compatible with ASCII.
4956
A folder located inside another folder is called a:
Answer:
Subfolder
A subfolder, or subdirectory, is a directory that is nested within another directory.
4957
What is the decimal equivalent of the hexadecimal number (A2)₁₆?
Answer:
162
'A' in hexadecimal is 10. So, (10 \* 16¹) + (2 \* 16⁰) = 160 + 2 = 162.
4958
Which Unicode encoding uses a fixed width of 4 bytes (32 bits) for every character?
Answer:
UTF-32
UTF-32 is a fixed-length encoding where every single Unicode code point is represented by 4 bytes. This makes it simple to work with but often wastes space.
4959
The process of restoring a compressed file to its original state is called:
Answer:
Extraction
Extraction, or decompression, reverses the compression process.
4960
Turning analog signals into digital for computer processing is termed:
Answer:
Digitising
Digitising is converting analog signals to a format suitable for computer processing.