Computer Hardware and Devices

Correct Answer: Floppy disk

Correct option is (4). 

A daisy wheel printer is a type of impact printer that uses a rotating wheel with raised characters (like flower petals) to strike the ribbon against paper. Impact printers create characters by physical contact, unlike laser printers which use toner and heat.

ROM (Read-Only Memory) is 'essentially empty' in the sense that it contains no user-writable or changeable content - it's pre-programmed during manufacturing and cannot be modified by normal use. RAM can be written to, EPROM can be erased and reprogrammed, PROM can be programmed once. Only ROM is permanently fixed.

Computer monitors are typically connected to the system unit via a cable (such as VGA, DVI, HDMI, or DisplayPort cables). While 'wire' is physically similar, 'cable' is the correct terminology for monitor connections. A bus is internal to the computer, and line driver is an electronic component, not a connection method.

An output device displays or presents information from the computer (printer, VDU-Visual Display Unit, CRT-Cathode Ray Tube monitor). An input device sends data TO the computer. A keyboard is an input device - you type on it to send information to the computer, making it the correct answer as 'not an output device'.

The CPU (Central Processing Unit) is considered the heart of a computer as it executes instructions, performs calculations, and coordinates all other components. Without a CPU, a computer cannot process data or run programs.

A complete computer system requires all three components: a CPU for processing, memory for data storage, and input/output devices for communication with users and other systems. None of these alone constitutes a complete computer.

PROM (Programmable Read-Only Memory) can be written only once by the user using special equipment. After programming, it becomes permanent and non-volatile like ROM. RAM is volatile, ROM is pre-programmed, and EEPROM can be rewritten multiple times.

ROM (Read-Only Memory) is programmed during manufacturing and cannot be changed afterward. It contains permanent instructions and data that the computer needs to boot up. Unlike PROM, it's not user-programmable.

Cassette tapes use sequential access because data must be read in the order it was written - you must fast-forward or rewind to reach specific locations. Unlike disks, you cannot jump directly to any point on the tape.

Microfilm readers use OCR (Optical Character Recognition) technology to read text from microfilm and convert it to digital data. COM (Computer Output Microfilm) creates microfilm, and MICR (Magnetic Ink Character Recognition) is used for checks.

Impact printers work by physically striking a ribbon against paper, similar to a typewriter. This includes dot matrix, daisy wheel, and line printers. Laser and inkjet printers are non-impact because they use toner or ink without mechanical striking.

RAM is volatile memory that loses its contents when power is turned off. ROM, EPROM, and PROM are all non-volatile storage types that retain data even without power.

Disk drives require protection from dust (can cause head crashes), sunlight (heat damage), and temperature extremes (AC rooms maintain optimal operating conditions). All precautions are equally important for disk longevity.

Laser printers use a laser beam to create an electrostatic image on a drum, which attracts toner particles - no mechanical impact occurs on the paper. DMP (Dot Matrix) and daisywheel are impact printers that physically strike the paper through a ribbon.

ROM (Read-Only Memory) is non-volatile and permanently stores data that cannot be modified under normal operation. RAM, EPROM, and EROM (though EROM is an unusual term) are either volatile or erasable.

Memory is the hardware component where data and instructions are stored for processing by the computer system. Registers are temporary CPU storage, bus is a communication pathway, and control unit directs operations - none are primary data storage.

Winchester disk refers to a sealed hard disk drive with multiple platters stacked together on a spindle. It is not removable or flexible like floppy disks - the disk stack is permanently sealed inside the drive.