Input and Output Questions and Answers

Q: 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); }

Correct answer: -3The 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.

Q: The most common type of device for producing hard copy output is the

Correct answer: PrinterHard 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.

Q: Which of these is an impact printer ?

Correct answer: Dot matrix printerA 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.

Q: Bar Code and Optical Readers are

Correct answer: Input DevicesBoth 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.

Q: The part of a computer that coordinates all of its functions is called its

Correct answer: Control UnitThe 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.

Q: Input Devices that use a special ink that contains magnetizable particles of iron oxide are ____

Correct answer: MICRMagnetic 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.

Q: A computer mouse is another _________ device

Correct answer: Input DeviceA 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.

Q: Which of the following is not an output device?

Correct answer: ScannerA 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.

Q: Each program can have ___________.

Correct answer: All of TheseAll three are ordinary parts of a program. Input is the data it operates on, output is what it produces, and functions are how its instructions are organised into reusable units.The word "can" is doing the work: none is compulsory. A program may compute a constant result with no input, or produce no output at all, or be written as one block without functions. The option is correct because it asserts possibility rather than necessity.

Q: The wheel located between the two standard buttons on a mouse is used to ____

Correct answer: ScrollThe wheel between the two buttons rolls the view up and down a document or page. Clicking and selecting are done with the buttons on either side of it.

41.

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);
    }

A.-3
B.-5
C.4
D.Undefined

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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42.

The most common type of device for producing hard copy output is the

A.Plotter
B.Monitor
C.Speaker
D.Printer

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.

Discuss in Forum

43.

Which of these is an impact printer ?

A.Laser printer
B.Inkjet printer
C.Dot matrix printer
D.Thermal 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.

Discuss in Forum

44.

Bar Code and Optical Readers are

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

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.

Discuss in Forum

45.

The part of a computer that coordinates all of its functions is called its

A.Control Unit
B.System Board
C.ROM program
D.Arithmetic/ Logic Unit

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.

Discuss in Forum

46.

Input Devices that use a special ink that contains magnetizable particles of iron oxide are ____

A.Optical disks
B.Magnetic disks
C.MICR
D.Magnetic drives

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.

Discuss in Forum

47.

A computer mouse is another _________ device

A.Input Device
B.Output Device
C.Touch Device
D.Pointer 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.

Discuss in Forum

48.

Which of the following is not an output device?

A.Plotter
B.Printer
C.Scanner &nb

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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49.

Each program can have ___________.

A.Functions
B.Output
C.Input
D.All of These

Answer: D

Correct answer: All of These

All three are ordinary parts of a program. Input is the data it operates on, output is what it produces, and functions are how its instructions are organised into reusable units.

The word "can" is doing the work: none is compulsory. A program may compute a constant result with no input, or produce no output at all, or be written as one block without functions. The option is correct because it asserts possibility rather than necessity.

Discuss in Forum

50.

The wheel located between the two standard buttons on a mouse is used to ____

A.Click on web pages
B.Shutdown
C.Click and select items
D.Scroll

Answer: D

Correct answer: Scroll

The wheel between the two buttons rolls the view up and down a document or page. Clicking and selecting are done with the buttons on either side of it.

Discuss in Forum

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