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Solutions for Computer Applications, Class 9, CBSE
Kartik is applying for a graduate engineering program in a university. He wants to email his application along with the copies of his certificates. Which device will he prefer to create a digital copy of his certificates to attach with his application?
Kartik can use a scanner.
Meenu wants to create a high quality drawing in a variety of colours. Which device should she use for the same?
Meenu can use a light pen to create a high quality drawing in a variety of colours.
A Model school requires 1000 copies of high quality black and white printouts quickly. It requires the output to be printed quietly since an important meeting is being conducted in the office. Specify the type of printer for the above assignment.
Laser printer will be ideal for the above assignment.
I am a printer which operates like a typewriter. Identify me.
Daisy Wheel Printer operates like a typewriter.
Rita wants to enter numbers at a fast pace to perform mathematical calculations. Which type of keys will you suggest her to input data from the keyboard?
Rita can use the numeric keypad present on the right side of the keyboard.
Little Scholars Public School wants to take a backup of its school management information software for record purpose. Which storage device is the most suitable for this large amount of information?
A hard disk is the most suitable storage device for storing this large amount of information.
Mohit requires a black and white print out of his presentation on 'Reduction of Waste in the Environment'. He needs two copies of the presentation. Which printer is best suited for this work?
He can use laser printer.
The printed information on the paper is called ............... .
The printed information on the paper is called hardcopy.
The first scanner was the ............... scanner introduced in 1957.
The first scanner was the Drum scanner introduced in 1957.
............... printers produce images by spraying tiny droplets of ink onto the paper.
Ink-jet printers produce images by spraying tiny droplets of ink onto the paper.
............... is a type of scanner that can detect marks made with ink or pencil.
Optical Mark Reader (OMR) is a type of scanner that can detect marks made with ink or pencil.
............... is the light sensitive pointing device.
Light pen is the light sensitive pointing device.
............... is used to read characters from a printed page to the computer.
Optical Character Reader (OCR) is used to read characters from a printed page to the computer.
A CD can hold up to ............... MB of data whereas a DVD can hold upto ............... GB of data.
A CD can hold up to 900 MB of data whereas a DVD can hold upto 17 GB of data.
Memory stick was launched by ............... in October 1993.
Memory stick was launched by Sony in October 1993.
............... is a new optical disk format that is rapidly replacing DVD.
Blu-ray Disk is a new optical disk format that is rapidly replacing DVD.
The ............... prints its output on special heat sensitive paper.
The Thermal Printer prints its output on special heat sensitive paper.
List the different types of mouse. Explain them.
The different types of mouse are as follows:
Differentiate between Impact and Non Impact printers.
Impact Printers | Non 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. |
Discuss the features and applications of an MICR.
MICR stands for Magnetic Ink Character Recognition. This technology allows computers to read information from the printed documents.
MICR is used mainly by the banking industry to:
Write the difference between a DVD and a CD.
CD | DVD |
---|---|
CD stands for Compact Disc. | DVD stands for Digital Versatile Disc. |
The storage capacity varies from 650 MB to 900 MB. | A DVD can hold 4.7 GB to 17 GB of data. |
CDs are made of a polycarbonate disc with a reflective aluminum layer on one side. | DVDs are made of a polycarbonate disc with a reflective aluminum layer on both sides. |
CDs are more likely to be scratched or damaged, which can cause data loss. | DVDs are more durable than CDs as they have a protective layer on both sides of the disc. |
Explain the functions and usage of a bar code reader.
A barcode reader is an input device that scans barcodes and decodes the information they contain. A bar code is a combination of dark and light stripes. It is a computer readable representation of information, present in visual format. A bar code reader consists of a light source, a lens, and a light sensor for translating the optical impulses into electrical signals.
Barcode readers are used for a variety of purposes such as :
Explain the three main types of Non Impact printers.
The three main types of Non Impact printers are:
Write the types of monitors? Explain their features.
The different types of monitors are:
Cathode Ray Tube (CRT) Monitors — The features of a CRT monitor are:
Liquid Crystal Display (LCD) Monitors — The features of LCD monitors are :
Light Emitting Diode (LED) Monitor — LED display has the following features:
Discuss the various types of memory sticks.
The various types of memory sticks are:
Differentiate between Flatbed Plotter and Drum Plotter.
Flatbed Plotter | Drum Plotter |
---|---|
It is also known as a Table Plotter. | It is also known as a Roller Plotter. |
Flatbed plotters hold the paper still while the pen moves. They place the paper on a flat surface. | Drum plotters roll the paper over a cylinder. They wrap the paper around a drum. |
Flatbed Plotter are comparatively larger. | Drum plotters are generally smaller. |
Flatbed plotters have lower resolutions. | Drum plotters have lower resolutions. |
They are less noisy. | They are more noisy. |
THey are used for printing graphs. | They are used to produce continuous output, such as plotting earthquake activity. |
Explain the various types of keys of a keyboard.
The various types of keys of a keyboard are:
Discuss the features and applications of web cam.
A webcam is the short form of the web camera. It is a device primarily used to share a live image in real time to or through a computer in a network.
A webcam is connected to the computer by a USB cable or built into computer hardware, such as laptops. When sent to a remote location, the videos can be recorded, viewed, saved on the hard drive or live-streamed over the internet.
A webcam is widely used in organizations for video conferencing. They can also be used for video telephony, live streaming, social media, security, video surveillance etc.
Which of the following is not an I/O device?
CPU
Reason — CPU is the brain of the computer Printer and plotter are output devices and scanner is an input device.
Which of the following is not a pointing device?
Keyboard
Reason — Keyboard is not a pointing device. Mouse, light pen and trackball are pointing devices.
Which of the following is not a storage device?
Plotter
Reason — Plotter is an output device. CD ROM, DVD and flash drive are storage devices.
Whom do you think is the most probable user of a Light Pen?
Graphic Designer
Reason — Graphic Designer is the most probable user of a Light Pen.
Name the type of mouse which uses laser technology to detect the motion of the ball.
Optical mouse
Reason — Optical mouse uses laser technology to detect the motion of the ball.
Which is a vector based graphical printing device?
Plotters
Reason — Plotter is a vector based graphical printing device.
Which device scans images, documents, and saves them on a computer as a digital image?
Scanner
Reason — Scanner scans images, documents, and saves them on a computer as a digital image.
Which type of plotter is used to produce continuous output such as plotting earthquake activity?
Drum plotter
Reason — Drum plotter is used to produce continuous output such as plotting earthquake activity.
The diameter of the standard CD is ............... .
120 mm
Reason — The diameter of the standard CD is 120 mm.
The rate of data transmission of a DVD is faster than ............... .
CD-ROM
Reason — The rate of data transmission of a DVD is faster than CD-ROM.
The disk which uses blue violet laser to read and write is ............... .
Blu-ray Disk
Reason — The disk which uses blue violet laser to read and write is Blu-ray Disk.
The ............... offers more than five times the storage capacity of a traditional DVD.
Blu-ray Disk
Reason — The Blu-ray Disk offers more than five times the storage capacity of a traditional DVD.
A portable memory data storage device which is mainly used to transfer files from the hard drive of one computer to another is ............... .
Flash drive
Reason — A portable memory data storage device which is mainly used to transfer files from the hard drive of one computer to another is Flash drive.
Which removable flash memory card format was launched in 2003 as a joint effort of Sony and Scan Disk?
Memory Stick Pro
Reason — Memory Stick Pro is a removable flash memory card format was launched in 2003 as a joint effort of Sony and Scan Disk.
The speed of a Dot Matrix printer is measured in ............... .
cps
Reason — The speed of a Dot Matrix printer ranges from 50 (characters per second) to 500 (characters per second).
Dot-Matrix printer is a type of ............... .
Impact printer
Reason — Dot-Matrix printer is a type of impact printer.
Which of the following is an output device?
VDU
Reason — Visual Display Unit (VDU) is an output device.
A laser printer uses ............... .
Photocopy technology
Reason — A laser printer uses Photocopy technology.
Which of the following is used as an internal memory?
PROM
Reason — Programmable ROM (PROM) is used as an internal memory.
Main memory is ............... in nature.
Both 1 and 2
Reason — RAM and ROM are both main memory. RAM is a volatile memory and ROM is a non-volatile memory.
MICR stands for ............... .
Magnetic Ink Character Reader
Reason — MICR stands for Magnetic Ink Character Reader.
Which type of printer does not use physical impact while transferring characters to paper?
Non-impact printer does not use physical impact while transferring characters to paper.
Name two types of Impact printers.
Two types of Impact printers are:
Name the device which is used to give instruction to the computer.
Input devices are used to give instruction to the computer.
What are the four components of a computer?
The four components of a computer are:
Name any two pointing devices.
Two pointing devices are mouse and joystick.
Write the types of plotters. Name any two manufacturers of plotters.
The types of plotters are :
Two manufacturers of plotters are Hewlett Packard and Roland.
What is the storage capacity of Blu-ray Disk in GB?
Blu-ray disk can hold upto 25 GB of data on a single layer and 50 GB of data on a dual layer disk.
Name the versions and format of a DVD.
The versions of a DVD are single-sided and double-sided.
A DVD is available in many formats such as :
When and by whom was hard disk invented? Write the other name of hard disk.
Hard disk was introduced in 1954 by an IBM team led by Rey Johnson. The other name of hard disk is Winchester Disk.
Write the full form of VDU, CD-ROM, MICR, OCR, and OMR.
VDU — Visual Display Unit
CD-ROM — Compact Disk - Read Only Memory
MICR — Magnetic Ink Character Reader
OCR — Optical Character Reacher
OMR — Optical Mark Reader
Name the port which is used to connect a Flash drive.
Flash drive is plugged into the USB port of the computer.
Define some places where you find the application of touch screen.
Some places where we can find the application of touch screens are:
A scanner is an output device.
False
Reason — A scanner is an input device.
Storage capacity of a DVD is more than the capacity of Blu-ray Disk.
False
Reason — Blu-ray disk can store upto 6 times the data stored in a regular DVD.
Inkjet is a non-impact printer.
True
Reason — Inkjet is a non-impact printer.
An LCD monitor allows the user to input information by touching the icons on the screen.
False
Reason — ♦A touch screen isa special monitor that allows the user to input information by touching the icons on the screen.
Speech software is an output device to play sound.
False
Reason — Speaker is an output device to play sound.
Bar Code Reader is an input device used for marking objective type questions.
False
Reason — Optical mark Reader is an input device used for marking objective type questions in various examinations.
There are two types of printers.
True
Reason — There are two types of printers — Impact Printer and Non-impact Printers.
A Flatbed plotter is also known a Roller plotter.
False
Reason — A Flatbed plotter is also known as a Table Plotter.
A microphone is an input device used to record and store sound into a computer.
True
Reason — A microphone is an input device used to record and store sound into a computer.
There are 12 Function keys on the keyboard.
True
Reason — There are 12 Function keys on the keyboard.
Objects are created in 3D using additive process.
True
Reason — Objects are created in 3D using additive process.