Input and Output Questions and Answers

Answer: A

Correct answer: All-in-one devices

The two names describe the same product: a single unit combining printing, scanning, copying and often faxing.

"All-in-one" is the marketing term and "multifunction device" the technical one, and both point at the reason such units exist - the functions share a print engine, a scanning bar and a paper path, so combining them costs far less than separate machines. The device is neither purely input nor purely output, since it performs both.

Answer: A

Correct answer: Data Scanning devices

Data scanning devices read the source document itself, so the data never has to be transcribed - optical mark readers, optical character readers, bar code readers and magnetic ink character readers all belong to the class.

The gain is accuracy as much as speed: manual keying introduces errors at a rate that matters when the volume is large, and reading the original removes that step entirely. The other three options are not established categories.

Answer: A

Correct answer: Input Device

A touch screen reports where it was touched, so data flows into the computer and it is an input device - the same category as the mouse and the keyboard.

The confusion arises because it is physically combined with a display, which is an output device. The two functions are separate: the panel senses touch and the screen behind it shows the image. Combining them in one assembly is a packaging decision, not a change of category.

Answer: B

Correct answer: -1

\( -2 \) in two's complement is ...11111110. Right-shifting a signed negative value is implementation-defined, and every common compiler performs an arithmetic shift, propagating the sign bit into the vacated position.

That gives ...11111111, which is \( -1 \). The result is also what integer division would give with truncation towards negative infinity, which is why the arithmetic shift is chosen. A logical shift would bring in a zero at the top and give a large positive number instead.

Answer: A

Correct answer: Non-Impact Printer

A laser printer forms the image electrostatically: a laser writes a charge pattern on a drum, toner adheres to it, and heat fuses the toner to the paper. Nothing strikes the page.

Impact printers - dot matrix, daisy wheel, line printers - press a type element against a ribbon and the paper, which is what lets them print through carbon copies and what makes them noisy. The distinction explains both the quiet operation and the inability of a laser printer to produce multi-part forms.

Answer: C

Correct answer: Striping

Striping divides a file into blocks and writes consecutive blocks to different disks, so several drives transfer at once and the effective throughput multiplies.

The cost is reliability: with the data spread across every disk, the failure of any one of them loses the file, so striping alone - RAID 0 - is less reliable than a single drive. Combining it with mirroring or parity restores redundancy, which is what the higher RAID levels do.

Answer: D

Correct answer: 6 -6 0 1

Work left to right with the short-circuit rules. ++a makes a 6, which is non-zero and therefore true; ++b makes b −6, also non-zero and true, so the && yields 1.

The || then has a true left operand, so it short-circuits: ++c is never evaluated and c stays 0. The result d is 1. The trap is −6, which is true because it is non-zero - truth in C is non-zero, not positive.

Answer: C

Correct answer: Video Card

A CRT is driven by an analogue signal, and the video card is what produces it: the frame buffer holds digital pixel values and a digital-to-analogue converter turns them into the varying voltages that control the beam intensity.

That conversion is why the classic VGA connector carries analogue signals. Flat panels are digital devices, so DVI, HDMI and DisplayPort omit the conversion and send the pixel values directly - a change of interface following from a change of display technology.

Answer: B

Correct answer: Drum

A drum printer carries a cylinder engraved with a complete set of characters in a band for every print position. The drum spins continuously and a hammer strikes the paper as the wanted character passes, so a whole line is committed in one revolution.

That is what makes it a line printer with a fixed character set: nothing can be printed that is not engraved on the drum, so graphics are impossible. The speed was the attraction, and impact printing let it produce multi-part forms.

Answer: D

Correct answer: View or print data

Output devices present results: the monitor displays them and the printer puts them on paper. Entering, storing and scanning are the work of input and storage devices.