Computer MCQ (Multiple Choice Questions)

The correct answer is C) Mainframe computers.

EBCDIC (Extended Binary Coded Decimal Interchange Code) is an 8-bit character encoding used mainly on IBM mainframe computers and AS/400 systems. EBCDIC is an older character encoding standard that was widely used in the mid-20th century, but has largely been replaced by more modern encoding standards, such as ASCII and Unicode.
Option A (Minicomputers), Option B (Microcomputers), and Option D (Supercomputers) are incorrect because EBCDIC is not commonly used on these types of computers.
Therefore, the correct answer is C) Mainframe computers.

The correct answer is B) binary codes.
Instructions and memory addresses are represented by binary codes. Binary code is a digital code that represents information using only two digits: 0 and 1.
Option A (“character codes”) is incorrect because character codes represent characters, such as letters, numbers, and symbols, using binary codes.
Option C (“binary word”) is incorrect because a binary word is a fixed number of bits that are processed as a unit by a computer.
Option D (“parity bit”) is incorrect because a parity bit is a binary digit that is added to data to check for errors in transmission.
Therefore, the correct answer is B) binary codes.

The correct answer is C) Microcomputer.
IBM-PC (International Business Machines Personal Computer) is an example of a microcomputer. A microcomputer is a small, relatively inexpensive computer that is designed for personal or small-scale use.
Option A (The mainframe) is incorrect because a mainframe is a large, powerful computer that is used for processing massive amounts of data in a centralized manner.
Option B (Machine-in-built) is unclear and does not describe a specific type of computer.
Option D (Special purpose) is incorrect because a special purpose computer is a computer that is designed for a specific task or set of tasks, such as controlling a machine or instrument, and is not intended for general-purpose computing.
Therefore, the correct answer is C) Microcomputer.

The correct answer is C) It will erase the previous content.
When data is entered into a memory location, it will overwrite or replace the previous content of that location. Therefore, option C (“It will erase the previous content”) is the correct answer.
Option A (“It will add to the content of the location”) is incorrect because entering data into a memory location will replace the previous content, not add to it.
Option B (“It will change the address of the memory location”) is incorrect because the address of a memory location is fixed and does not change when data is entered into it.
Option D (“It will not be fruitful if there is already some data at that location”) is incorrect because data can be entered into a memory location that already contains data, but it will overwrite or replace the previous content.

The correct answer is B) AND gate.
The statement “All inputs must be in ON position to have an output” is true for an AND gate. An AND gate is a digital logic gate that produces an output that is only “true” (or “on”) when all of its inputs are “true” (or “on”). If any input is “false” (or “off”), the output will also be “false” (or “off”).
Option A (NOT gate) is incorrect because a NOT gate produces an output that is the opposite of its input. If the input is “true”, the output is “false”, and vice versa.
Option C (OR gate) is incorrect because an OR gate produces an output that is “true” (or “on”) if any of its inputs are “true” (or “on”). The output is only “false” (or “off”) if all of the inputs are “false” (or “off”).
Option D (XOR gate) is incorrect because an XOR gate produces an output that is “true” (or “on”) if the inputs are different. If both inputs are the same, the output is “false” (or “off”).

The correct answer is C) Cell.
The intersection of a column and row in a spreadsheet is called a cell. A cell is the basic unit of data storage in a spreadsheet and can contain text, numbers, or formulas that perform calculations based on other cells.
Option A (Key) is incorrect because it refers to a physical or virtual input device used to enter data into a computer system.
Option B (Field) is incorrect because it typically refers to a unit of data storage in a database that contains a single data value, such as a name or a date.
Option D (Menu) is incorrect because it typically refers to a graphical user interface element that displays a list of options or commands that a user can select.
Therefore, option C (Cell) is the correct answer.

The correct answer is D) Drum.
A magnetic storage device on which data is stored on a cylindrical drum, subdivided into tracks, is known as a drum. The drum was one of the earliest magnetic storage devices and was widely used in the 1950s and 1960s for data storage and processing.
Option A (Punched card) is a type of data storage medium that uses cards with holes punched in them to represent data.
Option B (Magnetic disk) is a magnetic storage device that uses spinning disks to store data. Magnetic disks are used in hard disk drives and floppy disk drives.
Option C (Magnetic tape) is a long, narrow strip of plastic or other material coated with a magnetic material on which data can be stored. Magnetic tape is commonly used for data backup and archival storage.
Therefore, options A (Punched card), B (Magnetic disk), and C (Magnetic tape) are incorrect.

The correct answer is A) the same.
The number of bits that are typically stored on each track of a magnetic disk is usually the same. Each track is divided into a fixed number of sectors, and each sector contains the same number of bytes or bits, depending on the disk’s formatting.
Option B (different) is incorrect because the number of bits stored on each track is typically the same, as explained above.
Option C (depend on the program to be stored) is also incorrect because the number of bits stored on each track is determined by the disk’s formatting and is not dependent on the program being stored.
Therefore, option D (All of the above) is also incorrect.

The correct answer is C) Microprocessor.
A microprocessor is a silicon chip that contains a central processing unit (CPU), which is responsible for executing instructions and performing data processing tasks in a computer. Microprocessors are commonly used in personal computers, smartphones, and other electronic devices.
RAM chips (Random Access Memory) are used for temporary data storage in a computer system.
ROM chips (Read-Only Memory) are used for permanent data storage and are typically used to store the computer’s firmware or operating system.
PROM chips (Programmable Read-Only Memory) are a type of ROM chip that can be programmed by the user after manufacture.
Therefore, options A (RAM chips), B (ROM chips), and D (PROM chips) are incorrect.

The correct answer is A) Register.
A register is a basic unit within a computer store capable of holding a single unit of data, typically a word or a small integer. Registers are located within the central processing unit (CPU) and are used to store temporary data, intermediate results, and memory addresses during the execution of machine instructions.
The arithmetic logic unit (ALU) is a digital circuit that performs arithmetic and logical operations on binary numbers.
The control unit is a component of the CPU that manages the execution of instructions by directing the flow of data and control signals between the CPU, memory, and input/output devices.
A store location refers to a specific location in a computer’s memory where data can be stored or retrieved.
Therefore, options B (ALU), C (Control unit), and D (Store location) are incorrect.