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Chapter 1 - Unit 2

Peripheral Devices

Class 7 - APC Understanding Computer Studies


State whether the following statements are True/False

Question 1

Input devices are used to feed the data and instructions in the computer system.
True

Question 2

A mouse is popularly known as a pointing device.
True

Question 3

You cannot receive or send a fax through an all-in-one printer.
False

Question 4

A cordless mouse or a keyboard works within a short range of distance from your computer system.
True

Question 5

A scanner can be compared to a photocopy machine.
True

Question 6

A light pen is used in computer aided designing (CAD).
True

Question 7

A scanned image cannot be sent to an e-mail editor.
False

Question 8

Digital photographs have low resolutions as compared to other photographs.
False

Question 9

A touchscreen is a menu-driven input device.
True

Question 10

A liquid crystal display (LCD) screen consumes less power and also radiates less heat.
True

Name the following

Question 1

Four input devices

Answer

  1. Mouse
  2. Keyboard
  3. Joystick
  4. Scanner

Question 2

Four output devices

Answer

  1. Speaker
  2. Monitor
  3. Printer
  4. LCD Projector

Question 3

Two types of impact printers

Answer

  1. Dot Matrix Printers
  2. Daisy Wheel Printers

Question 4

Two types of non-impact printers

Answer

  1. Inkjet Printers
  2. Laser Printers

Question 5

Two pointing devices

Answer

  1. Mouse
  2. Light Pen

Question 6

Two secondary storage devices

Answer

  1. Hard disk
  2. DVD

Define the following terms

Question 1

SD card

Answer

Secure Digital card is an ultra small flash memory or a non-volatile memory card designed to provide high capacity memory in a small size. It measures 32 X 24 X 2.1 mm and weighs approximately 2 grams.

SD cards are used in many small portable devices and the storage capacity varies from 1 GB to 16 GB.

Question 2

Mouse

Answer

A mouse is a pointing device. It is connected to the CPU. It consists of a roller at the bottom on which the upper part rolls. An optical mouse may not contain a roller but has a light source at the base to detect the position of the cursor.

A mouse has two or three buttons and a scroller. It moves on a soft rubber pad. With the movement of the mouse, a pointed arrow moves on the screen. The arrow on the screen is used to select items from the menu. The mouse cursor is taken to the desired place and then clicked to get the task done.

Question 3

Scanner

Answer

It is an input device which allows the user to take the images of the text and photographs from the source. The images can be saved on to the disks for further processing.

The document is placed on the glass scanning surface and a mechanically-driven scan head passes beneath it. The scanner captures high resolution images with outstanding quality that can automatically be sent for further processing.

Question 4

Visual Display Unit

Answer

A Visual Display Unit is an output device. It is similar to television screen having a cathode ray tube. A CRT consists of three main parts — electron gun, deflecting plates and a fluorescent screen.

A CRT converts electrical signals into visual signals. A computer screen receives digital signals and the resolution in a computer screen can be changed as per requirement. The size of the monitors varies from 8 inches to 21 inches.

Question 5

LCD Projector

Answer

A Liquid Crystal display projector is an output device used to magnify the presentations prepared on a computer. It accepts data/information from the CPU.

With the help of a small LCD panel, the data is fed and then passes through a convex lens. The presentations are then received on the screen in a magnified form.

These projectors are widely used in seminars, for demonstrations, in classrooms and in cinemas for showing movies.

Differentiate between the following

Question 1

Impact printers and Non-impact printers

Answer

Impact PrintersNon-Impact Printers
It forms characters by striking a print hammer against an inked ribbon.It forms characters without making direct contact with the paper.
It uses either ribbon or carbon paper.It uses ink cartridges.
It makes noise while printing.It prints smoothly on the paper.

Question 2

Input devices and Output devices

Answer

Input DevicesOutput Devices
Input devices are used to accept data and instructions by the computer.Output devices are used to get the results of any processed data.
For example — Mouse, Keyboard.For example — Speaker, Printer.

Question 3

Keyboard and Mouse

Answer

KeyboardMouse
It is similar to a typewriter that enables the user to enter data into the computer.It is a pointing device which is used to move the cursor all over the screen.
It has more than 104 keys on it.It has two or more buttons on it.
It is used for typing.It is used for selecting objects, playing games, making drawings etc.

Long Answer Questions

Question 1

What is a printer? What are its types?

Answer

Printers are common output devices used to get the results on paper. They provide information in a permanent and readable form. The data/information is transferred from the main memory of the computer to the printer and then printed on the paper.

Printers are of two types:

  1. Impact printers
  2. Non-impact printers

Question 2

Explain the three functions of a scanner.

Answer

The three functions of a scanner are-

  1. Scan — It captures the images that can be saved as a file or sent to an image editing application.

  2. Copy — It scans the images and sends it to the printer to get a hard copy at the same time.

  3. E-Mail — It scans the images and delivers it directly to the e-mail editor.

Question 3

How is a web camera useful to us?

Answer

Web cameras are the most common video capturing devices connected to computers. They can be used for video chatting over the internet. Webcams allow real-time communication from anywhere in the world. They can also be used for security purposes and to reach millions of mainstream PC users worldwide.

Question 4

Explain the working principle of recording and accessing data of a hard disk.

Answer

A hard disk pack consists of a number of rigid circular metallic plates coated with iron oxide. These circular plates are mounted on a common spindle and this pack is rotated at a high speed. The disk surface contains circular paths called tracks. Each track is further divided into sectors and form clusters when combined.

The data is recorded on the disks through the read-write head, which resembles a record player. The information that comes from the CPU is recorded digitally on the disk surface through the read-write head. Also, the information is retrieved digitally from the disk through the read-write head to the computer system for further processing.

Question 5

What is meant by a flash drive? Why is it so popular?

Answer

A flash drive is a portable data storage device. It is re-writable and holds the data in memory without power supply. It fits into any USB port of a computer. The drive is small, of the size of a human thumb and is a very stable memory storage device.

We can save text, music, documents and photos in this drive. The storage capacity of a flash drive is 32 GB or more. It is an ideal data storage device because at a low price, it offers long-term storage.

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