| Textbook | Kips Information Technology Class 9 |
| Part | A |
| Unit | Unit-3 Information and Communication Technology Skills |
| Chapter | 9 Peripheral Devices |
| Other Chapters Solutions | Kips IT Class 9 Solutions |
Contents
A. 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 port.
B. State True or False:
1. A joystick is a small instrument shaped like a pen used to provide input to mobiles, monitors and tables. – FALSE
2. A bar code is a computer readable representation of information, present in visual format. – TRUE
3. A monitor is also 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, clarity, and display than the LCD monitors. – TRUE
C. Answer the Following Questions:
What are peripheral devices? Give some examples.
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 add functionality to it. These devices are called Peripheral devices. Some Examples of Peripheral Devices are Optical disk drive, Modern, Bluetooth, Memory card reader, Digital Camera, Monitor, Printer, and CD ROM Drive.
What is a Scanner? What are its types?
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. Scanners are of three types Drum Scanner, Flatbed Scanner, Handheld Scanner.
What do you understand by a Monitor? Define pixels.
Monitor is the most common output device. It is also called Visual Display Unit (VDU), an electronic visual display for computers. Just like a television, a monitor also displays the output on the screen. Monitors display pictures by dividing the display screen into thousands (or millions) of minute dots called pixels, arranged in rows and columns. The pixels are so close together that they appear connected. The output displayed on the monitor is called soft copy.
What is HDD? Briefly explain its configuration.
It is the most common storage device for storing a large amount of data. It is also called HD or HDD (Hard Disk Drive) or Winchester Disk. It was introduced in 1954 by an IBM team led by Rey Johnson.
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. It has the following properties:
• Coated with magnetic material, it is hard and inflexible.
• It has a large storage capacity. It can store up to 8 TB of data.
• The disk rotates at a very high speed, varying from 5400 to 15,000 rpm (rotations per minute).
