Computer Science

Magnetic tape is generally the cheapest memory device among the options listed due to its low cost per unit of storage, especially for archival and backup purposes. Compact disks and flash memory tend to be more expensive per unit of storage, and magnetic disks are typically more costly than magnetic tape.

Programs stored in ROM are called firmware because firmware is a type of software permanently programmed into read-only memory (ROM) to control hardware devices.

A buffer acts as a holding area that temporarily stores data, allowing the CPU to manipulate or process it before transferring it to a device. ROM is read-only memory, a compiler is a program, and a tabulator is an old device for data processing, so these options are incorrect.

ROM (Read-Only Memory) stores data permanently in a computer, retaining information even when the power is off. RAM is temporary memory, CPU processes data but does not store it permanently, and 'None of these' is incorrect.

A computer device can read from and write to all the listed storage types: hard disk, RAM, and flash drive. Therefore, 'All of these' is the correct answer.

A Blu-ray Disc stores significantly more data than a DVD, typically up to 25 GB per layer compared to a DVD's 4.7 GB. Floppy disks, Green-ray Discs (which is not a standard term), and Compact Discs store much less data than DVDs.

PROM (Programmable Read-Only Memory) chips are programmed using devices called ROM burners, which write data onto the chip before it is permanently set. Other options like 'Chip Kits' or 'PROM Reader' do not accurately describe the programming device.

Cache memory is designed to store temporary data to speed up access to frequently used information. It does not store system files, cookies, browser history, or permanent data.

Cache memory is a small, fast memory located close to the CPU that stores frequently accessed data to speed up processing. It is faster and smaller than other memory types outside the CPU, making option C correct.

DVD+RW discs are rewritable DVDs that allow data to be erased and rewritten multiple times, unlike DVD+R which are write-once discs. Therefore, the correct answer is DVD+RW.