Part – A (Employability Skills)

Unit -III (Information and Communication Technology Skills)

Chapter-9

                                                            Peripheral Devices

I. Fill in the Blanks.

1.      A speaker converts an alternating electrical current into sound.

2.      Laser printers use a laser beam and powdered ink to produce fine print.

3.      A Plotter is a vector graphic printing device.

4.      Hard disk is made up of a collection of disks known as platters.

5.      Flash drive is plugged into the computer USB ports.

 II. State True or False:

1. A joystick is a small instrument shaped like a pen used to provide input to mobiles, monitors and tablets. (False)

2. A bar code is a computer readable representation of information, present in visual format. (True)

3. A monitor is called Visual Display Unit (VDU). (True)

4. The picture on a monitor is made up of thousands of small coloured dots called Pixars. (False)

5. LED monitors offer better colour quality, and display than the LCD monitors. (True)

III. Answer the following Questions:

1.     What are peripheral Devices? Give some examples.

Ans A computer system is made up of three major units that carry out its primary functions- Input, Output and Storage units. There are many other internal and external devices that connect to the computer directly and ad functionality to it. These devices are called Peripheral devices. The term peripheral device refers to all hardware components that are attached to a computer and are controlled by the computer system, but they are not the core components of the computer like the CPU, motherboard and power supply etc. Peripherals, in other words can also be defined as the devices which can be easily removed and plugged into a computer system.

For example: Digital Camera, Modem, Bluetooth, Monitor, Printer

2.     What is scanner? What are its types?

Ans It is an input device that scans text, images and objects optically. The scanned data is then converted into a digital image and displayed on the computer screen.

Types of Scanner:

1.      Drum Scanner

2.      Flatbed Scanner

3.       Handheld Scanner

3.     What do you understand by a Monitor? Define Pixels.

Ans Monitor is the most common output device. It is called Visual Display Unit (VDU) an electronic visual display for computers. Just like a television, a monitor also displays the output on the screen.

Pixels – Monitor display pictures by dividing the display screen into thousands of minute dots called pixels, arranged in rows and columns. The pixels are so close together that they appear connected.

4.      What is HDD? Briefly explain its configuration.

Ans It is the most common storage device for storing a large amount of data. It is called HD or HDD (Hard Disk Drive) or Winchester Disk. It was introduced in 1954 by an IBM team led by Rey Jhonson.

Hard Disk is made up of a collection of disks known as platters. Each platter requires two read/ write heads one for each side. All the read/ write heads are attached to a single access arm so that they do not move independently. Each platter has the same number of tracks to store data. A track location that cuts across all platters is called a cylinder.