RBSE Solutions for Class 9 Information Technology Chapter 2 Input/Output and Storage Devices
RBSE Solutions for Class 9 Information Technology Chapter 2 Input/Output and Storage Devices
Rajasthan Board RBSE Class 9 Information Technology Chapter 2 Input/Output and Storage Devices
TEXTBOOK QUESTIONS SOLVED
I. Multiple Choice Questions
Question 1.
Numeric key pad is used for:
(a) Text processing
(b) Graphics Works
(c) Banking works
(d) All of these
Answer:
(c)
Question 2.
Mouse is a:
(a) input device
(b) output device
(c) storage device
(d) None of these
Answer:
(a)
Question 3.
Speed of type metric:
(a) 20 bar per second
(b) 10 bar per second
(c) 5 bar per second
(d) 1 bar per second
Answer:
(b)
Question 4.
The final output available to a user on the monitor is known as
(a) Hard Copy
(b) Soft copy
(c) Micro film
(d) Floppy
Answer:
(b)
Question 5.
Which of the following technique of printing is equillient to type writer ?
(a) Type metric printing
(b) Impact printing
(c) Non-impact printing
(d) laser printing
Answer:
(b)
Question 6.
Drum printer is a type of
(a) character printer
(b) Line Printer
(c) Page printer
(d) Graphics Printer
Answer:
(a)
Question 7.
Which one is a primary storage medium?
(a) Hard disk
(b) memory
(c) CD ROM
(d) Magnetic tape
Answer:
(b)
Question 8.
Optical technique is used for:
(a) Hard disk
(b) Floppy Disk
(c) Ink Jet Printer
(d) CD ROM
Answer:
(d)
Question 9.
What is storage capacity of Micro floppy:
(a) 1.2 MB
(b) 650 MB
(c) 1.44 MB
(d) 2.8 MB
Answer:
(c)
Very Short Answer Type Questions
Question 1.
Which device is used for read and write on disk?
Answer:
Read/ write head
Question 2.
Tiny -dots on monitor is known as:
Answer:
Pixels
Question 3.
Dot matrix printer is an example of:
Answer:
Impact Printers
Question 4.
Hole in between floppy disk is known as:
Answer:
Index Hole
Question 5.
Give the types of memory.
Answer:
Memory is classified into two categories:
- Primary memory
- Secondary memory
Question 6.
What is the significance of a monitor?
Answer:
A computer monitor is an output device that displays the user interface and the information requested by the user.
Question 7.
Give the names of any two input and output devices.
Answer:
Input devices- keyboard, mouse Output devices- monitor, printers
Question 8.
Which technique is used for laser printer?
Answer:
Laser Beam
Question 9.
What is the significance of a projector?
Answer:
It is used to print maps, charts, Graphics, design electronic circuits etc.
III. Short Answer Type Questions
Question 1.
What is the difference between soft copy and hard copy of a documentation?
Answer:
The printed copy of a document is called a hard copy whereas, data stored in computer or in a CD/DVD or any storage Media is known as soft copy.
Question 2.
How does a laser printer work?
Answer:
When you print something, your computer sends a vast stream of electronic data to your laser printer. An electronic circuit in the printer figures out what all this data means and what it needs to look like on the page. It makes a laser beam scan back and forth across a drum inside the printer, building up a pattern of static electricity. The static electricity attracts onto the page a kind of powdered ink called toner. Finally, as in a photocopier, a fuser unit bonds the toner to the paper.
Question 3.
Differentiate between impact and non-impact printers.
Answer:
Impact printer: Produces text and images when tiny wire pins on print head strike the ink ribbon by physically contacting the paper.
Example: Dot-matrix printer
Non-impact printer: Produces text and graphics on paper without actually striking the paper.
Example: Inkjet, Laser.
Question 4.
What are the uses of mouse?
Answer:
A mouse is something you push along your desktop to make a cursor (pointing device) move on your screen. So, what a mouse has to do is figure out how much you’re moving your hand and in which direction. There are two main kinds of mouse and they do this job in two different ways, either using a rolling rubber ball (in a ball-type mouse) or by bouncing a light off your desk (in an optical mouse).
Question 5.
How does joystick and light pen work?
Answer:
Joystick In computers, a joystick is a cursor control device used in computer games and assistive technology . The joystick, which got its name from the control stick used by a pilot to control the ailerons and elevators of an airplane, is a hand-held lever that pivots on one end and transmits its coordinates to a computer. It often has one or more push-buttons, called switches, whose position can also he read by the computer, light pen-A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer’s CRT display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touch screen but with greater positional accuracy.
Question 6.
Give the name of types of plotter.
Answer:
A plotter is a printer that interprets commands from a computer to make line drawings on paper with one or more automated pens. Unlike a regular printer, the plotter can draw continuous point-to-point lines directly from vector graphics files or commands. There are different types of plotters: a drum plotter draws on paper wrapped around a drum which turns to produce one direction of the plot, while the pens move to provide the other direction; a flatbed plotter draws on paper placed on a flat surface; and an electrostatic plotter draws on negatively charged paper with positively charged toner.
IV. Long Answer Type Questions
Question 1.
How Does a Dot Matrix Printer Work? Explain it with diagram.
Answer:
All dot matrix printers create characters on paper by striking an inked ribbon with a hard surface. Unlike typewriters, which use a similar mechanism, dot matrix printers do not have fixed character shapes or fonts. Instead, each individual character is formed by the arrangement of a series of pins. This allows dot matrix printers to be used for basic graphical printing and multiple fonts as well as basic text printing — but it gives the printout a characteristic “dotted” appearance. Dot matrix printouts often produce lower-quality text that can be difficult to read. In addition, dot matrix printers generally are noisier than inkjet or laser models.
The print quality produced by a dot matrix printer is significantly affected by the number and size of pins in the print head – even the best dot matrix printers generally can’t match the quality of inkjet or laser printers.
The simplest dot matrix devices use just nine pins to produce each individual character, creating a pixelized, blocky appearance. More complex printers use a larger number of smaller pins, producing greater detail and eliminating the characteristic look of dot matrix text. Common arrangements for these printers include dual 9-pin and 24-pin print heads.
Question 2.
How many types of monitors? Explain with diagram
Answer:
A computer monitor, technically termed as a visual display unit, can be described as an electronic device that transmits information from the computer onto a screen, thereby acting as an interface and connecting the viewer with the computer. At present, computer monitors are available in a variety of shapes, designs, and colors. However, based on the technology used to make computer monitors, they can be broadly categorized into three types.
- CRT (Cathode Ray Tube)
- LCD (Liquid Crystal Display)
- LED (Light-Emitting Diodes)
(i) CRT (Cathode Ray Tube) Monitors:_These monitors employ the CRT technology which is used most commonly in the manufacturing of television screens. In this, a stream of intense high energy electrons is used to form images on a fluorescent screen. A cathode ray tube is a basically a vacuum tube containing an electron gun at one end and a fluorescent screen at another end. From this electron gun, a process called thermionic emission generates a strong beam of electrons.
These electrons travel through a narrow path within the tube with high speed using various electro-magnetic devices and finally strike the phosphor points present on the fluorescent screen, thus, creating an image.
There are several advantages of using CRT monitors:
- These monitors are highly reliable and efficient, and are capable of generating a resolution of up to 2048 x 1536 pixels, thereby providing a clear picture quality. Also, CRT monitors that are now available are capable of producing thousands of different colors.
- Secondly, CRT monitors are affordable and cost effective.
- Unlike conventional CRT monitors, modem technological advancements have resulted in the development of flat screen CRT monitors that reduce the glare and are good for the eyes.
(ii) LCD (Liquid Crystal Display) Monitors: Liquid crystal display, also known as liquid crystal diode, is one of the most advanced technologies available at present. Typically, an LCD monitor consists of a layer of color or monochrome pixels arranged schematically between a couple of transparent electrodes and two polarizing filters. Optical effect is achieved by polarizing the light in varied amounts and making it pass through the liquid crystal layer.
At present, there are two types of LCD technology available. These include the active matrix or TFT and a passive matrix technology. Among these, TFT technology is more secure and reliable, and generates better picture quality. On the other hand, passive matrix has a slow response time and is slowly becoming outdated.
In recent times, LCD monitors have become popular with consumers.
Some major advantages of using an LCD monitor include:
- These monitors are compact, lightweight, and do not consume much desk space.
- Secondly, these monitors do not consume much electricity and can even be operated by using batteries.
- Also, the images transmitted by these monitors do not get geometrically distorted and have little flicker.
(iii) LED (Light-Emitting Diodes) Monitors
LED monitors are the latest types of monitors in the market today. Like LCD, it is again a flat panel display making use of light-emitting diodes for back-lightning instead of Cold Cathode Fluorescent (CCFL) back – lightning used in LCDs. Primarily, the display is of LCD only but the back-lightning is done by LEDs.
LED monitors use much lesser power than CRT and LCD.
Thus, they are also considered environmental friendly.
Other core advantages of LED monitors are:
- They produce images with higher contrast.
- They have less negative environmental impact when disposed.
- Lifespan and durability of LED monitors is more than CRT or LCD monitors.
- Because of the technology, the monitor panels can be made very thin.
- Do not produce much heat while running.
Question 3.
Explain hard disk structure and working with diagram.
Answer:
Hard Disk Structure: As with floppy disks, each platter is divided into thin concentric bands known as tracks. There can be more than a thousand tracks on a 3.5 inch hard disk. The tracks are further subdivided into sectors. These are the smallest physical storage unit on a disk and they are almost always 512 bytes long.
A group of tracks which have the same track number, but are on different platters, is sometimes referred to as a cylinder, but this term is no longer widely used.
Tracks are created when the disk is initially formatted. There are normally 1024 tracks on a hard disk, numbered from 0 (at the edge of the disk) to 1023 (near the centre).
One obvious problem with this structure is that the tracks near the centre are shorter than those near the edge of the disk. To compensate for this, they are more densely populated with data, meaning that the same amount of data can be written or read over the same period of time, irrespective of the drive head position.
One side of the first platter has space reserved for hardware-based track-positioning information which is not available to the operating system. This data is written to the disk during assembly and is used by the disk controller to position the drive heads correctly. We have already noted that a sector is the smallest physical storage unit on the disk and is usually 512 bytes long. Files should ideally be stored in a single contiguous area of disk space. Since most files are longer than 512 bytes, the file system must allocate the number of sectors required to store the file, eg: a 640 byte file would require two sectors. If additional data is appended to the file later , further sectors can be allocated.
Question 4.
What is CD-ROM? Explain its uses.
Answer:
CD-ROM (Compact Disc, read-only-memory) is an adaptation of the CD that is designed to store computer data in the form of text and graphics, as well as hi-fi stereo sound. Format of the CD-ROM is the same as for audio CDs: a standard CD is 120 mm (4.75 inches) in diameter and 1.2 mm (0.05 inches) thick and is composed of a polycarbonate plastic substrate , one or more thin reflective metal layers, and a lacquer coating. Today, CD-ROMs are standardized and wall work in any standard CD-ROM drive. CD- ROM drives can also read audio compact discs for music, although CD players cannot read CD-ROM discs.
Question 5.
Explain types of printers and also explain their working.
Answer:
A printer is an electromechanical device which converts the text and graphical documents from electronic form to the physical form. Generally, they are the external peripheral devices which are connected with the computers or laptops through a cable or wirelessly to receive input data and print them on the papers. A wide range of printers are available with a variety of features ranging from printing black and white text documents to high quality colored graphic images.
(i) Types of Printers: Since the invention of the printing technology, a variety of technologies have been employed in computer printers. Broadly printers are categorized as impact and non impact printers. Impact printers are the type of printers in which a key strikes the paper to make a letter. The examples, of Impact
printers are Daisy wheel and Dot matrix printers. While non-impact printers do not operate by striking a head against a ribbon. Inkjet printers and laser printers are the non-impact printers. The most popular printers are described below:
- Daisy Wheel Printers: Daisy wheel printers print only characters and symbols and cannot print graphics. They are generally slow with a printing speed of about 10 to 75 characters per second. By 1980, daisy wheel printers were the dominant printers for quality printing but since the prices of laser and inkjet printers have declined and quality of dot matrix printers has been improved, the daisy wheel printers are now obsolete.
- Dot Matrix Printers: It is a popular computer printer that prints text and graphics on the paper by using tiny dots to form the desired shapes. It uses an array of metal pins known as printhead to strike an inked printer ribbon and produce dots on the paper. These combinations of dots form the desired shape on the paper. Generally they print with a speed of 50 to 500 characters per second as per the quality of the printing is desired. The quality of print is determined by the number of pins used (varying from 9 to 24).
The key component in the dot matrix printer is the ‘printhead’ which is about one inch long and contains a number of tiny pins aligned in a column varying from 9 to 24. The printhead is driven by several hammers which force each pin to make contact with the paper at the certain time. These hammers are pulled by small electromagnet (also called solenoids) which is energized at a specific time depending on the character to be printed. The timings of the signals sent to the solenoids are programmed in the printer for each character.
The printer receives the data from the computer and translates it to identify which character is to be printed and the print head runs back and forth, or in an up and down motion, on the page and prints the dots on the paper. - Line printer: Contains a chain of characters or pins that print an entire line at one time. Line printers are very fast, but produce low-quality print.
- Inkjet printers: Inkjet printers are most popular printers for home and small scale offices as they have a reasonable cost and a good quality of printing as well. A typical inkjet printer can print with a resolution of more than 300 dpi and some good quality inkjet printers are able to produce full colored hard copies at 600 dpi.
- Laser Printers: Laser printers are the most popular printers that are mainly used for large scale qualitative printing. They are among the most popularly used fastest printers available in the market. A laser printer uses a slight different approach for printing. It does not use ink like inkjet printers, instead it uses a very fine powder known as ‘Toner’.
ADDITIONAL QUESTIONS SOLVED
Multiple Choice Questions
Question 1.
Mathematical operations, such as addition subtraction are performed by:
(a) CU
(b) CPU
(c) MU
(d) ALU
Answer:
(d)
Question 2.
The final output available to a user on the monitor is known as
(a) Hardcopy
(b) Software
(c) Softcopy
(d) Bytes
Answer:
(c)
Question 3.
Which of the following is not a part of a CPU?
(a) MU
(b) ALU
(c) VDU
(d) CU
Answer:
(c)
Question 4.
The process of converting unorganized data into meaningful information according to user’s instructions is called
(a) Input
(b) Storage
(c) Output
(d) Processing
Answer:
(d)
Question 5.
Unorganized raw facts and figures given to a computer are collectively called
(a) ROM
(b) Information
(c) Output
(d) Data
Answer:
(d)
Question 6.
The basic organization of a computer does not consist of.
(a) Keyboard
(b) Input unit
(c) Output unit
(d) CPU
Answer:
(a)
Question 7.
CPU is known as:
(a) Brain of the computer
(b) Main memory unit of the computer
(c) Heart of the computer
(d) Nervous System of the computer
Answer:
(a)
Question 8.
ROM stores a set of instructions called
(a) DRAM
(b) PROM
(c) BIOS
(d) SRAM
Answer:
(c)
Question 9.
The type of ROM which can have its contents erased by ultraviolet light is called
(a) PROM
(b) EPROM
(c) EEPROM
(d) Flash memory
Answer:
(c)
Question 10.
A commonly used storage device is
(a) RAM
(b) ROM
(c) Hard disk
(d) SRAM
Answer:
(c)
Question 11.
The smallest unit of memory is
(a) Byte
(b) Bit
(c) Nibble
(d) KiloByte
Answer:
(b)
Question 12.
The special high speed memory which stores frequently used instructions so that a CPU can access them quickly is called
(a) DRAM
(b) Cache
(c) PROM
(d) Flash memory
Answer:
(b)
Question 13.
The memory which is programmed at the time of manufacturing and cannot be modified later is called
(a) EPROM
(b) PROM
(c) ROM
(d) RAM
Answer:
(b)
Question 14.
In which form the data is represented in Digital computers?
(a) Analog form
(b) Decimal form
(c) Binary form
(d) Octal form
Answer:
(c)
Question 15.
Which of the following category is not included in Micro computers?
(a) Tablet PC
(b) Laptop computer
(c) Super computer
(d) Handheld devices
Answer:
(c)
Question 16.
This memory requires less power and has a great speed. It is majorly used in Intel Pentium 4 systems.
(a) DRAM
(b) SRAM
(c) DDR
(d) SDRAM
Answer:
(c)
Question 17.
Data is stored in computers in the form of
(a) Characters
(b) Numbers
(c) Binary digits
(d) All, the above
Answer:
(c)
Question 18.
Which of the following is called volatile memory?
(a) ROM
(b) RAM
(c) Hard disk
(d) None of the above
Answer:
(b)
Question 19.
Arrange the units of memory in ascending order.
(a) Bit, Byte, Megabyte, Kilobyte
(b) Bit, Byte, Kilobyte, Megabyte
(c) Bit, Kilobyte, Byte, Terabyte
(d) None of the above
Answer:
(b)
Question 20.
What does MIPS stand for?
(a) Mental Input Processing System
(c) Most Intelligent Processing System
(b) Millions of Instructions Per Second
(d) None of the above
Answer:
(b)
Question 21.
Which of the following is/are units of memory?
(a) Metre
(b) Kilobyte
(c) Tbyte
(d) All the above
Answer:
(b)
Question 22.
What kind of hardware is used in the input phase of a computer-based information system?
(a) Keyboard
(b) Printer
(c) Monitor
(d) Hard disk
Answer:
(a)
Question 23.
Which type of mouse uses Light-Emitting Diode (led) to detect the movement of cursor on the screen?
(a) Optical
(b) Mechanical
(c) Laser
(d) All of them
Answer:
(a)
Question 24.
Dot matrix is a type of.
(a) Tape
(b) Printer
(c) Disk
(d) Bus
Answer:
(b)
Question 25.
A group of 8 bits is called
(a) Byte
(b) Word
(c) Record
(d) File
Answer:
(a)
Question 26.
The data stored in-is lost when the computer power is turned off.
(a) Hard disk
(b) ROM
(c) CD
(d) Floppy
Answer:
(b)
Question 27.
RAM stands for
(a) Random Access Memory
(b) Read Only Memory
(c) Randomly Accessing Memory
(d) Rambus Only Memory
Answer:
(a)
Question 28.
ALU stands for
(a) Any Logical Unit
(b) Arithmetic Logic Unit
(c) Abraham Lincoln University
(d) Academy of Life Underwriting
Answer:
(b)
Question 29.
printer uses a beam of laser for printing.
(a) Dot matrix
(b) Inkjet
(c) Laser
(d) Drum
Answer:
(c)
Question 30.
Mouse performs two of the most common actions, one is click and the second is
(a) Double click
(b) Dragging
(c) Moving
(d) Selecting
Answer:
(a)
Question 31.
1 megabyte is equal to bytes.
(a) 1,024
(b) 10,48,576
(c) 8
(d) 10
Answer:
(b)
Question 32.
OCR stands for
(a) Optical Character Reader
(b) Only Character Reader
(c) Optical Character Recognition
(d) Operational Character Reader
Answer:
(a)
Question 33.
Which among the following is a type of printer?
(a) Disk
(b) Bus
(c) Plotter
(d) Dot matrix
Answer:
(d)
Question 34.
Which of the following is not an input device?
(a) Keyboard
(b) Mouse
(c) Joystick
(d) Plotter
Answer:
(d)
Question 35.
stores data that is required by the CPU.
(a) Speaker
(b) LAS
(c) Printer
(d) ALU
Answer:
(d)
Question 36.
A computer stores data internally in the form of. numbers.
(a) Binary
(b) Data
(c) MICR
(d) ASCII
Answer:
(d)
Question 37.
One kilobyte is equal to bytes.
(a) 1024
(b) 10024
(c) 500
(d) 8
Answer:
(a)
Question 38.
The is one of the most vulnerable devices in a computer.
(a) Keyboard
(b) Hard disk
(c) Speaker
(d) Monitor
Answer:
(b)
Question 39.
Printer that does not establish any mechanical contact between the print head and paper is known as
(a) Non-impact
(b) Impact
(c) Dot-matrix
(d) All of the above
Answer:
(b)
Question 40.
………is a medium-sized scanner which has a rolling drum to scan your document
(a) Drum
(b) Flatbed
(c) Handheld
(d) All of the above
Answer:
(c)
Question 41.
You can perform arithmetic operations in a computer by
(a) Monitor
(b) ALU
(c) Control unit
(d) RAM
Answer:
(b)
Question 42.
Which two symbols are used by the binary system?
(a) 0,1
(b) 1,5
(c) 0,0
(d) 1,1
Answer:
(a)
Question 43.
Which of the following are not examples of nonimpact printer?
(a) Daisy wheel
(b) Laser
(c) Dot Matrix
(d) Plotter
Answer:
(b)
Question 44.
USB stands for
(a) Universal Serial Bus
(b) Uniform Serial Bus
(c) Specific Binary
(d) All of the above
Answer:
(a)
Question 45.
Who is the inventor of Q WERTY keyboard?
(a) John
(b) T. Edison
(c) John McCain
(d) Christopher Sholes
Answer:
(d)
Question 46.
……….was created by Ralph H. Baer in 1967.
(a) Monitor
(b) Keyboard
(c) Mouse
(d) Joystick
Answer:
(d)
Question 47.
Which of the following is not an I/O device?
(a) Printer
(b) CPU
(c) Plotter
(d) Scanner
Answer:
(b)
Question 48.
Which of the following is not a pointing device?
(a) Mouse
(b) Light pen
(c) Keyboard
(d) Track ball
Answer:
(c)
Question 49.
Which of the following is not a storage device?
(a) CD ROM
(b) DVD
(c) Plotter
(d) Flash drive
Answer:
(c)
Question 50.
Out of the following, whom do you think is the most probable user of a Light Pen?
(a) Computer Programmer
(b) Graphic Designer
(c) Journalist
(d) Scientist
Answer:
(b)
Question 51.
Name the type of mouse which uses laser technology to detect the motion of the ball.
(a) Optical mouse
(b) Mechanical mouse
(c) Opto Mechanical mouse
(d) All of these
Answer:
(a)
Question 52.
Which is a vector based graphical printing device?
(a) Printers
(b) Plotters
(c) Scanners
(d) Light pen
Answer:
(b)
Question 53.
Which device scans images, documents and saves them on a computer as a digital image?
(a) MICR
(b) Joystick
(c) Scanner
(d) None of these
Answer:
(c)
Question 54.
The diameter of the standard CD is
(a) 70 mm
(b) 80 mm
(c) 120 mm
(d) 180 mm
Answer:
(c)
Question 55.
The speed of a Dot Matrix printer is measured in
(a) dpi
(b) cps
(c) bits
(d) All of these
Answer:
(a)
Question 56.
Dot-Matrix printer is a type of.
(a) Impact printer
(b) Non Impact printer
(c) Manual printer
(d) Matrix printer
Answer:
(a)
Question 57.
Which of the following is an output device?
(a) Mouse
(b) CPU
(c) VDU
(d) Joystick
Answer:
(c)
Question 58.
A laser printer uses
(a) Heat sensitive paper
(b) Spray ink
(c) Photocopy technology
(d) None of these
Answer:
(c)
Question 59.
Which of the following is used as an internal memory?
(a) CD ROM
(b) PROM
(c) Hard disk
(d) Memory stick
Answer:
(b)
Question 60.
M1CR stands for
(a) Magnetic Ink Character Reader
(b) Magnetic Inch Character Reader
(c) Magnetic Ink Code Reader
(d) None of these
Answer:
(a)
Question 61.
The keyboard does not consist of.
(a) Mouse
(b) Function keys
(c) Control keys
(d) Numeric keypad
Answer:
(a)
Question 62.
Identify the picture.
(a) Barcode
(b) MICR code
(c) Memory Stick
(d) None of the above
Answer:
(a)
Question 63.
Which of these secondary devices has the maximum data storage capacity?
(a) Memory Stick
(b) Floppy
(c) CDROM
(d) Blu-ray
Answer:
(d)
Question 64.
This code is generally observed at the bottom of all bank cheque. ‘What is it called?
(a) Magnetic Code
(b) Magnetic Code Reader
(c) Bar Code
(d) None of the above
Answer:
(a)
II. Very Short Answer Type Questions
Question 1.
What do you mean by input devices?
Answer:
The device that is used to enter data or instructions in a computer is known as an input device. For example, Keyboard and Mouse.
Question 2.
What is a CPU (Central Processing Unit)?
Answer:
A Central Processing Unit (CPU) is the brain of a computer system. It controls all the operations and consists of, arithmetic and logic unit and control unit.
Question 3.
What do you mean by Control Unit?
Answer:
The control unit co-ordinates and controls all the other parts of the computer system. It controls and guides the flow and maintenance of data.
Question 4.
What is the function of Arithmetic and Logic Unit?
Answer:
The arithmetic and logic unit does the actual processing by performing mathematical and logical operations, such as making comparison.
Question 5.
Define keyboard.
Answer:
Keyboard is an input device, it is one of the important components of a computer. It looks like a typewriter. Besides the normal alphabet keys, it also has a numeric keypad located to its right.
Question 6.
What is scanner? How many types of scanner are available in the market?
Answer:
Scanner is a device that can transfer typed or handwritten texts, graphs, diagrams, and photographs to a computer.
The following are the types of scanner:
Handheld scanner Flatbed scanner and Drum scanner
Question 7.
What is a CPU?
Answer:
CPU is a physical device that controls computer operations. It is the brain of the computer system and helps run programs by using various instructions. All the operations related to searching, sorting, calculating, and decision making take place in the CPU.
III. Short Answer Type Questions
Question 1.
Which output device is used to produce graphical plots on paper or polyester films? Explain its functioning.
Answer:
Plotters are used to produce high quality graphics, charts and visuals on paper or polyester films. They are vector based. They are used to draw lines and graphics. They are used for graphical applications like Computer Aided Designing(CAD) and for printing maps and drawings.
Question 2.
Write the characteristics of Non-Impact printers.
Answer:
- Non-Impact printers do not make physical contact between the printer head and the paper.
- They are quieter than Impact printers.
- These printers have better print quality.
- Coloured graphics can also be printed with these printers.
Question 3.
What is a microphone? Describe its usage.
Answer:
A microphone is an input device used to record sound and store voice into a computer. The files are generally stored as a .wav file. Most of the laptops have inbuilt microphones unlike the desktop computers. Microphones are used in video conferencing and speech recognition programs as well as in recording narration in PowerPoint presentations.
Question 4.
What is a monitor? How many types of monitor are available in the market?
Answer:
A computer monitor is an output device that displays the user interface and the information requested by the user. Monitors are classified based on the technology they use to display both images and text.
The following are the two types of monitor:
Cathode Ray Tube (CRT) and Liquid Crystal Display (LCD).
Question 5.
Explain the working of a laser printer.
Answer:
The laser printer uses a beam of laser for printing. Laser printers work on the principle of electro-photography used in a photocopy machine. The primary principle at work in a laser printer is static electricity, which is simply an electric charge induced or generated on an insulated object, such as a human body.
Question 6.
What is a light pen?
Answer:
Light pen is a pointing device that has a photocell mounted in the pen-shaped tube. When one keeps the pen in front of an element of the computer screen, say the Start button, it senses the light and the photocell gets activated. A pulse is generated and the electric response is transferred to the CPU, which recognizes the point to which the light pen is pointing. Light pens are frequently used for computer-aided design (CAD) applications.
Question 7.
Name two distinct categories of printers.
Answer:
The following are two distinct categories of printers:
Impact printer: It establishes a mechanical contact between the print head and the paper. There are various types of impact printers, such as line printers, drum printers, and dot-matrix printers.
Non-impact printer: It does not establish any mechanical contact between the print head and the paper. This printer was introduced to overcome the low speed and high cost of impact printers. The well- known non-impact printers are inkjet and laser printers.
Question 8.
What is an input device? Explain the input device that is used to convert handwritten text into machine readable format.
Answer:
An input device is used to enter data or information into the computer for processing. E.g. a mouse.
The input device that is used to read characters from a printed paper into the computer is called an Optical Character. Reader (OCR)-The OCR reads the characters with the help of a light source and photoelectric cells. It converts the scanned text into a computer readable format. The text is then edited using any word processor or text editor in a document.
Question 9.
Which input device is used to play video games in a more interesting way? Explain why?
Answer:
A Joystick is a pointing device that makes playing video games more interesting. This is because if allows the user to move the cursor or object anywhere on the screen with the help of a stick. The position of the cursor is determined by the movement of the stick. This creates simulations in the game making it exciting for the user.
Question 10.
Define the different types of scanners.
Answer:
There are basically three types of scanners:
- Drum Scanner
- Flatbed Scanner
- Handheld Scanner
(i) Drum Scanner: It uses a rotating glass drum to scan. In a Drum scanner, the light from the object that is to be scanned is split into separate red, blue and green beams optically making the image precise. This mechanism is called the Photo Multiplier Tubes (PMT) technology. This is the most efficient and expensive scanner. The Drum scanners are used mainly in the publishing industry to print high quality images in books and magazines.
(ii) Flatbed Scanner: In this type of scanner, the object to be scanned is placed face down on a glass window, which is illuminated with a bright light. It uses the Charged Coupled Device (CCD) technology to read the entire area optically. The Flatted scanners are used in homes, schools and medium sized offices.
(iii) Handheld Scanner: It is a manual device, which is dragged over the surface of the image to be scanned. This scanner is difficult to operate since it needs a steady hand to scan objects in order to avoid distorted images. The wide images are difficult to scan using this device. It is mainly used in libraries and shopping malls.
Question 11.
Which technology is used in a Laser printer? What are its basic features?
Answer:
Laser printers use photocopy technology to print. They use a laser beam and dry powdered ink to produce a high quality dot matrix pattern. They can print graphic images too. They are ideally used when good quality and large scale printing is required. The resolution is very high, approximately 600-1200 dots per inch,
Question 12.
Write the applications of an LCD monitor.
Answer:
An LCD monitor uses the light modulating properties of liquid crystals. It is gaining popularity because of its excellent images quality and consumes less^ power. LCD technology is used in computer monitors, television, instrumental panels, aircraft cockpit displays etc. They are also used in devices such as clocks, watches, calculators, gaming devices and telephones.
Question 13.
Name the device that is used to manipulate information on a computer screen by directly touching it.
Answer:
Light pen
Question 14.
Name the technique that is used to convert scanned image files into editable documents.
Answer:
The technique used for converting scanned files into editable documents is called OCR that stands for Optical Character Recognition.
Question 15.
What is MICR?
Answer:
MICR stands for Magnetic Ink Character Recognition. It is a character recognition technique used by banks to print special numeric information on the cheques with magnetic ink.
Question 16.
Give two advantages of laser and inkjet printers.
Answer:
Laser printer:
- Very fast printing, almost 10-15 pages per minute.
- The cost of running is very low.
Inkjet printer:
- Higher resolution.
- Perfect for home or office because of its small size.
Question 17.
Look at your school computer and list 3 input and 3 output devices. Now, provide one line definition of each device.
Answer:
The following is the list of input devices:
- Keyboard: It is an input device that looks like a conventional typewriter. It is used to type letters, numbers, and commands.
- Mouse: It is the basic input device that controls the movement of the cursor or pointer on the display screen.
- Scanner: It is a device that can transfer typed or handwritten texts, graphs, diagrams, and photographs to a computer.
The following is the list of output devices:
- Monitor: It is an output device that displays the computer’s user interface and the information requested by the user.
- Printer: It is an output device that prints the data processed by a computer. It produces images on paper, such as numbers, alphabets, and graphics.
- Speaker: It is an output device that receives sound in the form of electric current from a sound card and then converts it to the sound format.
Question 18.
Identify the following devices:
Answer:
(a) Keyboard
(b) Mouse
(c) Joystick
(d) Handheld Scanner
Question 19
Which of the following statements is not correct?
(a) The device that lets you enter data or instructions in a computer is known as an input device.
(b) The name QWERTY comes from the first six letters of the top-left alphabet rowr of the keyboard.
(c) A mouse can perform four types of actions: click, select, drag, and double click.
(d) A barcode reader is an output device that is used to print the code on products.
Answer:
(d) A bar code reader is an output device that is used to read the bar code from products.
Question 20.
(a) List three main factors that affect the computer’s performance.
(b) The number of applications that are running on your computer simultaneously can slow the computer’s performance. Is it right or wrong? Give a concise note to support your answer.
Answer:
(a) The three factors that affect computer’s performance are: CPU speed, Memory size, and Number of applications
(b) Yes, it is right because all the applications that run on the computer are stored in RAM. Therefore, the space of the memory RAM is eventually filled up by the opened applications.
Question 21.
What is the difference between RAM and ROM?
Answer:
Difference between RAM and ROM are:
| RAM | ROM |
| Random Access Memory is volatile i.e. the memory is temporary. | Read Only Memory is non volatile i.e. the memory is permanent. |
| We can read and w’rite the data present in the RAM | We can only rad the data present in ROM. |
| RAM stores the application programs. | ROM stores the initial program to start a computer. |
| The types of RAM are SRAM, DRAM, SDRAM and DDR. | The types of ROM are PROM, EPROM and EEPROM and Masked ROM. |
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