Which number system is used internally by computers? MCQ with Answer and Explanation

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Which number system is used internally by computers?

A. Hexadecimal

B. Decimal

C. Octal

D. Binary

Answer: Option D

Solution (By JKSSB Mock Tests)

Computers use binary (base-2) because electronic switches can represent two states: on/off.

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Question #1

What is the basic unit of data in a computer?

A. Byte

B. Bit

C. Word

D. Nibble

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Correct Answer: Option B

Explanation:
The bit (binary digit) is the smallest unit of data in a computer, representing a 0 or 1.

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Question #2

A type of small computer that is designed to fit entirely onto a single circuit board, containing a microprocessor, RAM, and basic I/O interfaces for hobbyists is a:

A. Single-board Microcomputer

B. Mainframe

C. Analog Controller

D. Supercomputer

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Correct Answer: Option A

Explanation:
Single-board computers (like the Raspberry Pi) are full microcomputers built on a lone circuit board, widely used for embedded projects.

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Question #3

What is the full form of EBCDIC?

A. Extended Binary Code Decimal Interchange Code

B. External Binary Coded Decimal Interchange Code

C. Extended Binary Coded Decimal Interchange Code

D. Efficient Binary Coded Decimal Interchange Code

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Correct Answer: Option C

Explanation:
EBCDIC stands for Extended Binary Coded Decimal Interchange Code, used in IBM mainframes.

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