A plotter is best suited to producing ________.
Answer: D
Correct answer: large engineering and architectural drawings
A plotter draws continuous lines, so it renders vector artwork such as maps and building plans at large sizes without the stepped edges a dot-based printer would produce. This makes it standard in design and surveying offices.
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A type of printer that produces quality output using technology similar to that of a photocopy machine is
Answer: A
Correct answer: Laser Printer
The similarity to a photocopier is exact rather than approximate: both charge a photosensitive drum, discharge it selectively to form a latent image, develop it with toner and fuse the toner to the paper with heat.
The difference is only in how the latent image is made - a laser scanning the drum against a reflected optical image. An ink-jet works quite differently, spraying droplets, and "non-impact printer" is the wider class both belong to rather than the particular technology.
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What will be the output of the following C code?
#include <stdio.h>
void main()
{
int a = -5;
int k = (a++, ++a);
printf("%d\n", k);
}
Answer: A
Correct answer: -3
The comma operator evaluates its left operand, discards the result, then evaluates the right and yields that value.
So a++ runs first, taking a from −5 to −4 and yielding −5, which is thrown away. Then ++a takes a to −3 and yields −3, which is assigned to k. The comma also introduces a sequence point, so the two modifications of a are properly ordered and the behaviour is defined.
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The most common type of device for producing hard copy output is the
Answer: D
Correct answer: Printer
Hard copy means output on a physical medium that persists when the power is removed, and the printer is by far the most common device producing it.
A monitor produces soft copy, which vanishes when the display changes, and a speaker produces sound rather than any copy at all. A plotter does produce hard copy, but it is a specialised device for large drawings and is nothing like as common as the printer.
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Which of these is an impact printer ?
Answer: C
Correct answer: Dot matrix printer
A dot matrix printer strikes an inked ribbon against the paper with pins, which is what makes it an impact printer. That physical contact is also why it can print carbon copies, something laser and inkjet printers cannot do.
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Bar Code and Optical Readers are
Answer: C
Correct answer: Input Devices
Both convert something physical into data for the computer: a bar code reader senses the pattern of bars with a light source and photodetector, and an optical reader senses marks or characters on a page.
The direction of the data settles the classification - into the machine, therefore input. Their value is speed and accuracy: reading a bar code avoids the keying errors that manual entry of the same number would introduce, which is why retail and logistics adopted them so completely.
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The part of a computer that coordinates all of its functions is called its
Answer: D
Correct answer: Control Unit
The control unit directs the operation of the whole machine: it fetches each instruction, decodes it, and issues the timing and control signals that make the other components act on it in the right order.
The arithmetic and logic unit is directed rather than directing - it performs the calculations and comparisons the control unit tells it to. The two together make up the CPU. The system board carries the components and provides the interconnections, and ROM holds firmware rather than coordinating anything.
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Input Devices that use a special ink that contains magnetizable particles of iron oxide are ____
Answer: C
Correct answer: MICR
Magnetic ink character recognition prints characters in ink containing iron oxide, which is magnetised before reading so that each character produces a distinctive waveform in the read head.
The advantage over optical reading is robustness: the characters can still be read through an overprinted signature, a stamp or a smudge, because it is the magnetic signal rather than the visible image that is sensed. Banks adopted it for cheque processing for exactly that reason.
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A computer mouse is another _________ device
Answer: A
Correct answer: Input Device
A mouse sends data to the computer - movement and button states - which makes it an input device by definition, the same category as the keyboard.
"Pointing device" is a true description too, but it names a subclass rather than the category the question asks for: the word "another" invites the classification that also covers the keyboard. Touch screens and trackballs belong to the same subclass, all of them input devices supplying position rather than characters.
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Which of the following is not an output device?
Answer: C
Correct answer: Scanner
A scanner reads a document and sends the image into the computer, so it is an input device. Plotters, printers and monitors all present results to the user and are therefore outputs.
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