Computer Hardware : MCQs & PYQs with Explanation

Option D

An input device is a hardware device used to provide data and control signals to a computer. It allows users to enter information into the computer system for processing.

Input Devices and Their Functions:

Output Devices and Their Functions:

Devices with Both Input and Output Functions:

Option B

An input device is a hardware device used to provide data and control signals to a computer. It allows users to enter information into the computer system for processing.

Input Devices and Their Functions:

Output Devices and Their Functions:

Devices with Both Input and Output Functions:

Option C

Dot Matrix Printers are Impact Printers that use tiny pins to strike an ink ribbon, forming characters or images as a pattern of dots on paper.
They are called Serial Printers because they print one character at a time, moving horizontally across the page.
In contrast, line printers print one entire line at a time, and page printers (laser printers) print a full page at once.

Option B

A Joystick is an input device used to control the movement or actions of a device or object in a graphical environment or machine. It typically consists of a stick that can move in multiple directions, often accompanied by buttons for performing additional actions.

Joysticks are commonly employed in situations where precise, real-time control of movement is required, such as operating industrial robots, playing computer games, or training with flight simulators.

Option B

In Computer Graphics, a CRT (Cathode Ray Tube) display forms images by using an electron beam to illuminate points called pixels or picture elements on the screen.
Resolution refers to the maximum number of distinct points (pixels) that can be displayed on the screen without overlap. It determines the level of detail that can be displayed.
For example, a display resolution of 1024 × 768 means that the screen can represent, 1024×768 = 786,432 distinct picture elements (pixels), arranged as 1024 columns and 768 rows.

Option A

The Keyboard is the primary text input device of a computer, enabling users to enter alphanumeric and special characters directly.

Option D

Sensors are specialized input devices that measure physical conditions such as, temperature, humidity / moisture, pressure, and light intensity. The sensor convert these measurements into electrical signals that a computer can process.

Option A

A QR Code (Quick Response Code) has three position-detection squares that help scanners identify the orientation of the code.

• Two squares are located at the top-left and top-right corners.
• The third square is located at the bottom-left corner.

These position markers allow QR readers to quickly detect, align, and decode the information, regardless of the code’s angle or rotation.

Option C

Hardware refers to the physical components of a computer system, the parts that you can see and touch, such as the keyboard, monitor, printer, and motherboard. Hardware performs tasks based on the instructions given by software.

Software refers to the set of programs or instructions that tell the hardware how to perform specific tasks. It cannot be touched physically and includes applications like MS Word, Web Browser (Chrome, Firefox, Edge), and the operating system.

Option C

A Pointing Device is input device that allows a user to interact with a computer by controlling the movement of a pointer on the screen.