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
5141
The output of a NOR gate is 1 only when:
Answer:
All inputs are 0
A NOR gate is a "NOT OR" gate. It gives a true (1) output only when all of its inputs are false (0).
5142
Multiplying any binary number by (10)₂ has what effect?
Answer:
It shifts all bits one position to the left, adding a 0 at the end
This is the binary equivalent of multiplying by 10 in the decimal system. It's a quick way to multiply by 2.
5143
The term "parent directory" refers to:
Answer:
The directory that contains the current directory.
The parent directory is the directory immediately above the current one in the hierarchy.
5144
A "file path" is:
Answer:
The sequence of directories that leads to a specific file or folder.
A file path provides the exact location of a file within the directory structure, starting from the root.
5145
The number 258 is a valid number in which system?
Answer:
Decimal
The number contains the digit '8'. This digit does not exist in binary (0-1) or octal (0-7). It is only valid in systems with a base of 9 or higher, such as decimal (base-10).
5146
In an 8-bit system, what is (11111111)₂ + (00000001)₂?
Answer:
(00000000)₂ with a carry
Adding 1 to the largest 8-bit number causes all bits to flip to 0 and a carry bit to be generated out of the most significant position. This is an example of an overflow. (In decimal: 255 + 1 = 256). The 8 bits can only hold the 0s from the result 256.
5147
A "truth table" is used to show:
Answer:
The output of a logic gate or circuit for all possible combinations of inputs
A truth table is a systematic way to represent the logical function of a gate by listing every possible input state and the corresponding output state.
5148
A character is represented in EBCDIC by:
Answer:
Eight bits
In the EBCDIC encoding system, each character is represented using eight bits.
5149
Baudot code uses how many bits per symbol?
Answer:
5
The Baudot code is a 5-bit character code used in telegraphy.
5150
The number (101)₂ is an example of a number in which system?
Answer:
Binary
The subscript '2' indicates that the number is in base-2, which is the binary system.