Input and Output Questions and Answers

Q: An equipment that looks like a printer or photocopy machine, but provides a variety of capabilities, including scanning and copying, is called

Correct answer: Multifunction DeviceA multifunction device combines printing, scanning, copying and often faxing in one unit, sharing the paper path, the scanning bar and the print engine between the functions.Copying is the clearest illustration of the sharing: it is simply a scan followed immediately by a print, requiring no new hardware once both are present. The economy of shared components is why such devices largely replaced separate machines in offices, and they are commonly called all-in-one devices.

Q: Which is the device used for converting maps, pictures and drawings into digital form for storage in computers?

Correct answer: DigitizerA digitizer is used to trace an existing drawing or map: the operator follows the lines with a stylus or cursor and the tablet reports each position, so the result is a set of coordinates - vector data.A scanner produces an image instead, a grid of pixels with no knowledge of what the lines are. That difference is the point: coordinates can be scaled, edited and measured, which is what mapping and computer-aided design need, whereas an image must first be traced or vectorised.

Q: What will be the output of the following C code? #include <stdio.h> int main() { if (~0 == 1) printf("yes\n"); else printf("no\n"); }

Correct answer: no~0 inverts every bit of zero, giving all ones - which as a signed int is \( -1 \), not 1.So the test is -1 == 1, which is false, and the else branch prints no. The identity worth remembering is \( \mathtt{\sim}x = -x-1 \), which gives \( \mathtt{\sim}0 = -1 \) immediately. The confusion is with the logical !, where !0 genuinely is 1 - one character apart and opposite in result.

Q: The most common method of entering text and numerical data into a computer system is through the use of a ____

Correct answer: KeyboardText and numbers are typed, and the keyboard is the device for typing. A scanner captures an image of a page rather than its characters, and printers and plotters are output devices.

Q: The I/O devices are sometimes called the peripheral devices because they surround the CPU and memory of the computer system.

Correct answer: TrueThe name is literal: peripheral means "at the edge", and these devices sit outside the processor and main memory, connected through controllers, buses and ports.The distinction is architectural rather than physical. A hard disk inside the case is still a peripheral, because it is reached through a controller rather than being addressed directly as memory is. What defines the core is direct access by the processor; everything else surrounds it.

Q: Trackballs are used as

Correct answer: Input DevicesA trackball is a mouse turned over: the ball is rotated directly by the fingers and the movement is reported to the computer, so data flows in and it is an input device.It belongs to the pointing device subclass along with the mouse, touchpad and touch screen. Its practical advantage is that the device itself does not move, which suits confined spaces and installations where a mouse would slide about - on ships, on aircraft flight decks and in industrial consoles.

Q: Which of these is an output device ?

Correct answer: SpeakerA speaker converts data held in the computer into sound the user can hear, so it carries information outward. Joysticks, barcode readers and webcams all capture information and send it into the machine.

Q: OMR, used to evaluate multiple-choice answer sheets, stands for ________.

Correct answer: Optical Mark ReaderAn Optical Mark Reader detects the presence or absence of a pencil mark in a defined position, which is why answer sheets ask for a bubble to be filled completely. It differs from OCR, which recognises the shapes of characters themselves.

Q: MICR character set consists of only 2 digits 0 and 1.

Correct answer: FalseThe E-13B character set used for MICR has fourteen characters: the ten digits 0 to 9 and four special symbols marking the transit, amount, on-us and dash fields on a cheque.Restricting it to two would make it useless for printing account and cheque numbers, which is its whole purpose. The characters have a deliberately distinctive shape, with thick and thin strokes, so that each produces a waveform the read head can distinguish unambiguously.

Q: Which of these is both an input and an output device ?

Correct answer: Touch screenA touch screen displays output and accepts input through the same surface, which is why it counts as both. A scanner and a light pen take input only, and a plotter produces output only.

61.

An equipment that looks like a printer or photocopy machine, but provides a variety of capabilities, including scanning and copying, is called

A.Duplicator
B.Multifunction Device
C.Special-Purpose Device
D.Scanner

Answer: B

Correct answer: Multifunction Device

A multifunction device combines printing, scanning, copying and often faxing in one unit, sharing the paper path, the scanning bar and the print engine between the functions.

Copying is the clearest illustration of the sharing: it is simply a scan followed immediately by a print, requiring no new hardware once both are present. The economy of shared components is why such devices largely replaced separate machines in offices, and they are commonly called all-in-one devices.

Discuss in Forum

62.

Which is the device used for converting maps, pictures and drawings into digital form for storage in computers?

A.Digitizer
B.Scanner
C.Image Scanner
D.MICR

Answer: A

Correct answer: Digitizer

A digitizer is used to trace an existing drawing or map: the operator follows the lines with a stylus or cursor and the tablet reports each position, so the result is a set of coordinates - vector data.

A scanner produces an image instead, a grid of pixels with no knowledge of what the lines are. That difference is the point: coordinates can be scaled, edited and measured, which is what mapping and computer-aided design need, whereas an image must first be traced or vectorised.

Discuss in Forum

63.

What will be the output of the following C code?

#include <stdio.h>
    int main()
    {
        if (~0 == 1)
            printf("yes\n");
        else
            printf("no\n");
    }

A.yes
B.no
C.compile time error
D.undefined

Answer: B

Correct answer: no

~0 inverts every bit of zero, giving all ones - which as a signed int is \( -1 \), not 1.

So the test is -1 == 1, which is false, and the else branch prints no. The identity worth remembering is \( \mathtt{\sim}x = -x-1 \), which gives \( \mathtt{\sim}0 = -1 \) immediately. The confusion is with the logical !, where !0 genuinely is 1 - one character apart and opposite in result.

Discuss in Forum

64.

The most common method of entering text and numerical data into a computer system is through the use of a ____

A.Plotter
B.Scanner
C.Printer &nb

Answer: D

Correct answer: Keyboard

Text and numbers are typed, and the keyboard is the device for typing. A scanner captures an image of a page rather than its characters, and printers and plotters are output devices.

Discuss in Forum

65.

The I/O devices are sometimes called the peripheral devices because they surround the CPU and memory of the computer system.

A.True
B.False

Answer: A

Correct answer: True

The name is literal: peripheral means "at the edge", and these devices sit outside the processor and main memory, connected through controllers, buses and ports.

The distinction is architectural rather than physical. A hard disk inside the case is still a peripheral, because it is reached through a controller rather than being addressed directly as memory is. What defines the core is direct access by the processor; everything else surrounds it.

Discuss in Forum

66.

Trackballs are used as

A.Output Devices
B.Memory Devices
C.Storage Devices
D.Input Devices

Answer: D

Correct answer: Input Devices

A trackball is a mouse turned over: the ball is rotated directly by the fingers and the movement is reported to the computer, so data flows in and it is an input device.

It belongs to the pointing device subclass along with the mouse, touchpad and touch screen. Its practical advantage is that the device itself does not move, which suits confined spaces and installations where a mouse would slide about - on ships, on aircraft flight decks and in industrial consoles.

Discuss in Forum

67.

Which of these is an output device ?

A.Joystick
B.Speaker
C.Barcode reader
D.Webcam

Answer: C

Correct answer: Speaker

A speaker converts data held in the computer into sound the user can hear, so it carries information outward. Joysticks, barcode readers and webcams all capture information and send it into the machine.

Discuss in Forum

68.

OMR, used to evaluate multiple-choice answer sheets, stands for ________.

A.Optical Mark Reader
B.Optical Memory Reader
C.Online Mark Recognition
D.Optical Mode Recorder

Answer: A

Correct answer: Optical Mark Reader

An Optical Mark Reader detects the presence or absence of a pencil mark in a defined position, which is why answer sheets ask for a bubble to be filled completely. It differs from OCR, which recognises the shapes of characters themselves.

Discuss in Forum

69.

MICR character set consists of only 2 digits 0 and 1.

A.True
B.False

Answer: B

Correct answer: False

The E-13B character set used for MICR has fourteen characters: the ten digits 0 to 9 and four special symbols marking the transit, amount, on-us and dash fields on a cheque.

Restricting it to two would make it useless for printing account and cheque numbers, which is its whole purpose. The characters have a deliberately distinctive shape, with thick and thin strokes, so that each produces a waveform the read head can distinguish unambiguously.

Discuss in Forum

70.

Which of these is both an input and an output device ?

A.Scanner
B.Touch screen
C.Plotter
D.Light pen

Answer: A

Correct answer: Touch screen

A touch screen displays output and accepts input through the same surface, which is why it counts as both. A scanner and a light pen take input only, and a plotter produces output only.

Discuss in Forum

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