Railway Science (Computer – Input / Output Devices)

Total Questions: 11

1. Which of the following is an input device ? [RRB NTPC CBT - I (16/01/2021) Morning]

Correct Answer: (b) Optical character reader
Solution:

It detects pencil marks or any printed text and converts them into computer -readable codes. An inkjet printer (Output device) is a computer peripheral that produces hard copies of a text document or photo by spraying droplets of ink onto paper.
A projector (Output device) or image projector is an optical device that projects an image onto a surface, commonly a projection screen. Headphones are a type of hardware output device that can be connected to a computer's line-out or speakers port, as well as wirelessly using Bluetooth.

2. Which among the following units is used to count the speed of modern Printers ? [RRB NTPC CBT - I (02/02/2021) Morning]

Correct Answer: (d) PPM
Solution:

Pages Per Minute is the measurement standard for a page. A printer is a device that accepts text and graphics output from a computer, and it transfers this information to paper, sheets.

3. Which of the following is a hardware input device in a computer? [RRB NTPC CBT - I (12/02/2021) Morning]

Correct Answer: (c) Scanners
Solution:

It is a device that captures images from photographic prints, posters, magazine pages, and similar sources for computer editing and display. VDU is an output device that displays text and graphics on a screen.
A speech synthesizer (output unit) is a computerized device that accepts input, interprets data, and produces audible language. Plotters (Output device) are used to print graphical output on paper.

4. Which of the following is NOT an internal part of the computer ? [RRB NTPC CBT - I (27/02/2021) Evening]

Correct Answer: (b) Flash drive
Solution:

Internal parts of the computer are CPU, Drive (e.g., Blu-ray, CD-ROM, DVD, Floppy Drive, Hard Drive, and SSD), Fan (heat sink), Modem, Motherboard, Network card, Power supply, RAM. A motherboard is the main printed circuit board (PCB) in a computer.

5. Which of the following groups consists of only output devices? [RRB NTPC CBT - I (12/03/2021) Evening]

Correct Answer: (d) Plotter, printer and monitor
Solution:

Examples of Output Devices, Monitor, Plotter, Printer, Headphones, Computer Speakers, Projector, GPS (Global Positioning System), Sound Card, Video Card.

6. How many colours are available in a computer monitor with 16 bits per pixel depth ? [RRB NTPC CBT - I (21/3/2021) Evening]

Correct Answer: (a) 65536
Solution:

8 bits per pixel- 256, 24 bits per pixel- 16777216.

7. ‘Track Ball’ falls into which of the following categories ? [RRB NTPC CBT - I (01/04/2021) Evening]

Correct Answer: (a) Input Device
Solution:

Examples of Input devices are keyboard, joystick, mouse, light pen, scanner, graphics tablet, microphone, barcode reader.

8. The line, daisy wheel, laser and drum are of the following types: [RRB NTPC CBT - I (07/04/2021) Morning]

Correct Answer: (a) Printers
Solution:

Johannes Gutenberg invented the first printing machine. A Daisy Wheel Printer is a type of impact printer that uses a rotating wheel (called the daisy wheel) to print characters.
A laser printer is a popular type of computer printer that uses a non-impact photocopier technology where there are no keys striking the paper.
A drum printer is an early type of impact printer that uses a revolving drum with engraved characters on its surface.

9. A typewriter-like tool, which is used to send data or commands to the computer is called: [RRB NTPC CBT - I (08/04/2021) Evening]

Correct Answer: (d) Keyboard
Solution:

A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling.

10. A pixel is : [RRB NTPC CBT - I (31/07/2021) Evening]

Correct Answer: (c) the smallest resolvable part of a picture
Solution:

The pixel (a word invented from "picture element") is the basic unit of programmable color on a computer display or in a computer image.