Computer & IT

note!Answer: D) transport layer
The transport layer provides end-to-end (host-to-host) connectivity and reliable delivery between processes.

note!Answer: A) broad cast
Broadcast is the simultaneous transmission of data to multiple stations.

note!Answer: A) OCR
OCR (Optical Character Recognition) scans printed text and converts it into editable digital text.

note!Answer: B) plotter
A plotter draws continuous lines with pens, which makes it suitable for engineering and architectural drawings.

note!Answer: D) optical disk
Optical disks such as CDs and DVDs store data as tiny pits burned or pressed onto a circular disk and read with a laser.

note!Answer: D) laser printer
Laser printers use a light beam to form an electrostatic image on a drum, which attracts toner powder onto the paper.

note!Answer: A) to make the most efficient use of the computer hardware
An operating system manages hardware and software resources so that the computer is used efficiently.

note!Answer: D) all of the above
An operating system manages memory, the processor, and disk and I/O devices together.

note!Answer: A) allowing job to use the processor
Scheduling is the OS function that decides which job or process gets to use the processor and when.

note!Answer: A) assembler
An assembler translates assembly language source code into machine-level object code.

note!Answer: C) execute more jobs in the same time period
Multiprogramming keeps several jobs in memory so the CPU switches between them, increasing the number of jobs completed in a given time.

note!Answer: A) strike a ribbon against the paper to produce character images.
Impact printers form characters by striking a ribbon against paper, while inkjet, thermal, and laser printers are non-impact.

note!Answer: C) thick and thin lines
Barcodes encode data in patterns of thick and thin parallel lines and spaces.

note!Answer: B) slower and less expensive
Secondary storage such as tape or disk is slower than main memory but cheaper per unit of storage.

note!Answer: C) 2^n locations
With n address lines, there are 2^n distinct binary addresses, so 2^n memory locations can be addressed.

note!Answer: A) DMA
Direct Memory Access (DMA) transfers large blocks of data between devices and memory with little CPU involvement.

note!Answer: C) fetch-decode-execute sequence
The CPU repeatedly fetches an instruction from memory, decodes it, and then executes it.

note!Answer: B) bit-byte-field-record-file-database
The data hierarchy goes from bit to byte, then field, record, file, and database.

note!Answer: B) memory unit
A basic microcomputer needs input, output, a processor, and a memory unit to store data and instructions.

note!Answer: A) mathematical intensive scientific applications
Supercomputers are used for heavy numerical computation such as scientific simulations.