Tamilnadu State Board New Syllabus Samacheer Kalvi 11th Computer Science Guide Pdf Chapter 1 Introduction to Computers Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 11th Computer Science Solutions Chapter 1 Introduction to Computers

11th Computer Science Guide Introduction to Computers Text Book Questions and Answers

Section A

Book Evaluation

Choose the correct answer

Question 1.
First generation computers used
a) Vacuum tubes
b) Transistors
c) Integrated circuits
d) Microprocessors
Answer:
a) Vacuum tubes

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 2.
Name the volatile memory
a) ROM
b) PROM
c) RAM
d) EPROM
Answer:
c) RAM

Question 3.
Identify the output device
a) Keyboard
b) Memory
c) Monitor
d) Mouse
Answer:
c) Monitor

Question 4.
Identify the- input device
a) Printer
b) Mouse
c) Plotter
d) Projector
Answer:
b) Mouse

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 5.
________ Output device is used for printing building plan, flex board, etc.
a) Thermal printer
b) Plotter
c) Dot matrix
d) inkjet printer
Answer:
b) Plotter

Question 6.
In ATM machines, which one of the following is used
a) Touch Screen
b) Speaker
c) Monitor
d) Printer
Answer:
a) Touch Screen

Question 7.
When a system restarts, which type of booting is used?
a) Warm booting
b) Cold booting
c) Touch boot
d) Real boot
Answer:
a) Warm booting

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 8.
Expand POST
a) Post on self Test
b) Power on Software Test
c) Power on Self Test
d) Power on Self Text
Answer:
c) Power on Self Test

Question 9.
Which one of the foUowing is the main memory?
a) ROM
b) RAM
c) Flash drive
d) Hard disk
Answer:
b) RAM

Question 10.
Which generation of computer used IC’s?
a) First
b) Second
c) Third
d) Fourth
Answer:
c) Third

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Section – B

Book Evaluation

Short Answer Questions.

Question 1.
What is a computer?
Answer:
Computer is an Electronic Machine, capable of performing basic operations like addition, multiplication, division etc. Computer accepts data as input, process it, produce output and stores it for future.

Question 2.
Distinguish between data and information
Answer:

DATA INFORMATION
It is an unprocessed collection of raw facts It is a collection of processed facts from which conclusion may be drawn
It will not give any meaning It convey meaning

Question 3.
What are the components of a CPU?
Answer:
The Components of the CPU are:

  1. Control Unit
  2. Arithmetic and Logic Unit (ALU)
  3. Memory Unit.

Question 4.
What is the function of an ALU?
Answer:
The ALU performs operations such as addition, subtraction, multiplication, division and logical operations.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 5.
Write the functions of control unit.
Answer:
The control unit controls the flow of data between the CPU, memory I/O devices. It also controls the entire operations of a computer.

Question 6.
What is the function of memory?
Answer:
The memory is used to store the data for processing and for future reference.

Question 7.
Differentiate Input and output unit.
Answer:
Input unit:

  • An input device feeds information to a computer system for processing.
  • Input devices only allow for the input of data to a computer.
  • It is a peripheral device used to provide data and control signals to an information processing system such as a computer.
  • Example: keyboard, mouse.

Output unit:

  • The output device reproduces or displays the results of that processing.
  • Output devices only receive the output of data from another device.
  • It is a unit which sends data from the computer to another device.
  • Example: printer, monitor.

Question 8.
Distinguish Primary and Secondary memory.
Answer:
The primary memory is used to temporarily store the programs and data to execute currently. It is
volatile in nature.
The secondary memory is used to store the data permanently. It is non-volatile.

Section – C

Book Evaluation

Explain in brief

Question 1.
What are the characteristics of a computer?
Answer:
Characteristics of Computer

  • Speed : Very high speed ie. more than 1G“12 second.
  • Accuracy : Very high accuracy even with high speed.
  • Storage ; Computer can store any volume of data for a long time.
  • Diligence : Computer can work for hours without any break and creating error. It is suitable for repetitive jobs.
  • Versatility : Computer can perform variety of task.
  • Power of remembering : It can remember data for us.
  • No IQ : Computer itself having no thinking power. It works based on the given instruction.
  • No Feeling : Computer does not have emotions, knowledge, experience, feeling.

Question 2.
Write the applications of computer.
Answer:
The various applications of computers are:

  • Business – It is used in. business for Payroll preparation, Sales analysis, Budgeting, Financial forecasting, Managing employees database and Maintenance of stocks etc.
  • Education – It is used for online teaching with CBTs and WBTs,
  • Marketing – It is used for Selling & Promoting product.
  • Banking – It is used for Home banking with internet,- ATM etc.
  • Insurance – It is used to transact insurance operation.
  • Communication – Email, chatting etc,
  • Health Care – ECG’s, radiotherapy like monitoring devices.
  • Military – It builds the links between the soldiem and commanders through the satellite.
  • Engineering Design – Machine design, building plan, Interior design etc.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 3.
What is an input device? Give two examples.
Answer:

  • Input device is used to feed any form of data to the computer for further processing.
  • Keyboard – To feed text, numbers, special characters etc..
  • Mouse – Pointing device ie. to select an item on the screen.
  • Bar Code Reader – Scans the information on the bar codes transmits to the computer.

Question 4.
Name any three output devices.
Answer:

  • Monitor – To display the information.
  • Printer – It is used to print the information on papers.
  • Plotter – It is used to produce graphical output like building plan on paper.
  • Speaker – It produces voice output.

Question 5.
Differentiate optical and Laser mouse.
Answer:

OPTICAL MOUSE LASER MOUSE
It uses light source instead of ball to judge the motion of the pointer. Laser Mouse uses Laser Light   ‘
It is less sensitive towards surface. It is highly sensitive and able to work on any hard surface.

Question 6.
Write short note on impact printer.
Answer:
The impact printers print with striking of hammers or pins on ribbon. These printers can print on multi-part papers. Dot Matrix printers and Line matrix printers are impact printers.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 7.
Write the characteristics of sixth generation.
Answer:
The characteristics of sixth generation computers are:

  • Parallel and Distributed computing
  • Computers have become smarter, faster and smaller
  • Development of robotics
  • Natural Language Processing
  • Development of Voice Recognition Software.

Question 8.
Write the significant features of monitor.
Answer:
Monitor is the most commonly used output device to display the information. Pictures on a monitor are formed with picture elements called Pixels.
Monitors may either be Monochrome or can be color Types of monitors:

  • CRT (Cathode Ray Tube)
  • LCD (Liquid Crystal Display)
  • LED (Light Emitting Diodes).

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Section – D

Book Evaluation

Explain in detail

Question 1.
Explain the basic components of a computer with a neat diagram.
Answer:
The computer is the combination of hardware and software. Hardware is the physical component of a computer while software is the set of programs or instructions. Both hardware and software together make the computer system to function. Every task given to a computer follows an Input- Process- Output Cycle (IPO cycle).
Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers 1

The functional components of a computer

i) Input Unit ; Input unit is used to feed any form of data to the computer. Example: Keyboard, mouse, etc.
ii) Central Processing Unit: CPU is the major component which interprets and executes software instructions. It also controls the operation of all other components such as memory, input and output units.

The CPU has three components which are Control unit, Arithmetic and logic unit (ALU) and Memory unit.

iii) Arithmetic and Logic Unit : The ALU is. a part of the CPU where various computing functions are performed on data. The ALU performs arithmetic operations such as addition, subtraction, multiplication, division and logical operations.

iv) Control Unit : The control unit controls the flow of data between the CPU, memory and I/O devices. It also controls the entire operation of a computer.

v) Output Unit: An Output Unit is any hardware component that conveys information to users in an understandable form. Example: Monitor Printer etc.

vi) Memory Unit : The Memory Unit is of two types which are primary memory and secondary memory. The primary memory is used to temporarily store the programs and data when the instructions are ready to execute. The secondary memory is used to store the data permanently.

The Primary Memory is volatile, that is, the content is lost when the power supply is switched off. The Random Access Memory (RAM) is an example of a main memory.

The Secondary memory is non volatile, that is, the content is available even after the power supply is switched off. Hard disk, CD-ROM and DVD ROM are examples of secondary memory.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 2.
Discuss the various generations of computers.
Answer:
Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers 2 Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers 3 Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers 4

Question 3.
Explain the following
a) Inkjet Printer
b) Multimedia projector
c) Bar code / QR code Reader
Answer:
a) Inkjet Printers : Inkjet Printers use colour cartridges which combined Magenta, Yellow and Cyan inks to create color tones. A black cartridge is also used for monochrome output. Inkjet printers work by spraying ionised ink at a sheet of paper. The speed of Inkjet printers generally range from 1-20 PPM (Page Per Minute).

They use the technology of firing ink by heating it so that it explodes towards the paper in bubbles. An Inkjet printer can spread millions of dots of ink at the paper every single second.

b) Multimedia Projectors : Multimedia projectors are used to produce computer output on a big screen. These are used to display presentations in meeting halls or in classrooms.

c) Bar Code Reader: A Bar code is a pattern printed in lines of different thickness. The Bar code reader scans the information on the bar codes transmits to the Computer for further processing. The system gives fast and error free entry of information into the computer.

QR Code Reader : The QR (Quick response) code is the two dimension bar code which can be read by a camera and processed to interpret the image.

11th Computer Science Guide Introduction to Computers Additional Questions and Answers

Choose the correct answer

Question 1.
Natural language processing is a component of ………………
(a) ULSI
(b) AI
(c) ENIAC
(d) OCR
Answer:
(b) AI

Question 2.
The Analytical Engine was invented in the year ________
a) 1837
b) 1937
c) 1847
d) 1873
Answer:
a) 1837

Question 3.
The main component of second-generation ………………
(a) vacuum tubes
(b) microprocessor
(c) integrated circuits
(d) transistor
Answer:
(d) transistor

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 4.
Which led to the development of general-purpose computers?
a) Napier’s Bone
b) Analytical Engine
c) Slide Rule
d) None of these
Answer:
b) Analytical Engine

Question 5.
Period of fourth-generation ………………
(a) 1975 – 1980
(b) 1964 – 1975
(c) 1955 – 1964
(d) 1942 – 1955
Answer:
(a) 1975 – 1980

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 6.
________ is the first known calculating device.
a) Napier’s Bone
b) Slide Rule
c) Punched Card
d) Abacus
Answer:
d) Abacus

Question 7.
Which word can be related to the inkjet printer ………………
(a) Airlines
(b) Piezoelectricity
(c) matrix
(d) plotter
Answer:
(b) Piezoelectricity

Question 8.
Based on various stages of development, computers can be categorized in to ________generations.
a) 3
b) 4
c) 5
d) 6
Answer:
d) 6

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 9.
Which printer using the carbon papers ………………
(a) laser printer
(b) non – impact printers
(c) Impact printer
(d) all the above
Answer:
(c) Impact printer

Question 10.
The period of second generation is ________
a) 1942- 1955
b) 1955- 1964
c) 1964 – 1975
d) 1975-1980
Answer:
b) 1955- 1964

Question 11.
The retinal scanner uses the technique of ………………
(a) GUI
(b) UI
(c) Biometric
(d) None of these
Answer:
(c) Biometric

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 12.
The period of fourth generation is ________
a) 1942- 1955
b) 1955- 1964
c) 1964- 1975
d) 1975- 1980
Answer:
d) 1975- 1980

Question 13.
The components of CPU ………………
(a) control unit
(b) ALU
(c) Memory unit
(d) all the above
Answer:
(d) all the above

Question 14.
The period of sixth generation is________
a) 1980 – till date
b) 1975 – 1980
c) 1964 – 1975
d) In future
Answer:
d) In future

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 15.
Computer monitor displays the information in the form of ……………….
(a) vertical
(b) pictorial
(c) horizontal
(d) numeric
Answer:
(b) pictorial

Question 16.
________is a second-generation computer.
a) IBM 1401
b) IBM 1620
c) UNIVAC 1108
d) All the above
Answer:
d) All the above

Question 17.
Who invented analytical engine?
(a) Charles Babbage
(b) John von Newman
(c) Blaise pascal
(d) Dennis Richard
Answer:
(a) Charles Babbage

Question 18.
The weight of ENIAC was ________tons.
a) 27
b) 37
c) 28
d) 17
Answer:
a) 27

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 19.
In which generation UNIVACI was used?
(a) First
(b) Second
(c) Third
(d) Fourth
Answer:
(a) First

Question 20.
The ENIAC conusmed ________watts of power.
a) 150
b) 100
c) 1500
d) 15
Answer:
a) 150

Question 21.
IBM 1620 belongs to which computer generation of computers?
(a) I
(b) II
(c) III
(d) IV
Answer:
(b) II

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 22.
The main component used in second-generation computer is________
a) Transistors
b) Integrated Circuits
c) Vacuum Tube
d) Microprocessor
Answer:
a) Transistors

Question 23.
Honeywell 6000 series belongs to ……………… generation.
(a) First
(b) Second
(c) Third
(d) Fourth
Answer:
(c) Third

Question 24.
The main component used in fourth-generation computer is________
a) Transistors
b) Integrated Circuits
c) Vacuum Tube
d) Microprocessor
Answer:
d) Microprocessor

Question 25.
NLP is a component of ………………
(a) AI
(b) Hardware
(c) Circuit
(d) Electronics
Answer:
(a) AI

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 26.
The first operating system was developed during ________generation of computers.
a) first
b) second
c) third
d) fourth
Answer:
b) second

Question 27.
Which input device is a pointing device?
(a) Keyboard
(b) Monitor
(c) Mouse
(d) Scanner
Answer:
(c) Mouse

Question 28.
________language was used in first-generation computer.
a) Machine
b) Assembly
c) High Level
d) English
Answer:
a) Machine

Question 29.
Arithmetic and logical computation are done by ………………
(a) CU
(b) ALU
(c) BUS
(d) memory
Answer:
(b) ALU

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 30.
________language was used in third generation computer.
a) Machine
b) Assembly
c) High Level
d) English
Answer:
c) High Level

Question 31.
Which conveys information to the user in an understandable form?
(a) Input unit
(b) CU
(c) Output unit
(d) Bus
Answer:
(c) Output unit

Question 32.
Portable computers were introduced in __________ generation.
.a) Third
b) Fifth
c) Fourth
d) None of these
Answer:
b) Fifth

Question 33.
CD – ROM, DVD – ROM, DVD – ROM are examples of which of the following memory.
(a) read / write
(b) volatile
(c) primary
(d) non-volatile
Answer:
(d) non-volatile

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 34.
Artificial Inegeiligence introduced in ________generation.
a) Third
b) Fifth
c) Fourth
d) Second
Answer:
b) Fifth

Question 35.
Which one of the following is true?
(a) The no. of keys in any keyboard is always the same.
(b) All keyboard have strictly has the same layout.
(c) All keyboards are wired keyboards.
(d) All keyboards have alphabet and numeric keys.
Answer:
(d) All keyboards have alphabet and numeric keys.

Question 36.
_________ generation computers are capable of solving complex problems including decision making and logical reasoning,
a) Third
b) Fifth
c) Fourth
d) Second
Answer:
b) Fifth

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 37.
Mechanical, optical and laser are types of which input device.
(a) Keyboard
(b) Mouse
(c) Scanner
(d) Printer
Answer:
(b) Mouse

Question 38.
The ENIAC was invented by________
a) J.Presper
b) John Mauchly
c) Both A and B
d) Charles Babbage
Answer:
c) Both A and B

Question 39.
Which one of the following mouse type has more than 3 buttons and can be programmed?
(a) Mechanical
(b) Optical
(c) Laser
(d) 3D
Answer:
(c) Laser

Question 40.
The ENIAC was developed in the year ________
a) 1947
c) 1942
b) 1943
d) 1843
Answer:
c) 1942

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 41.
The device that reads the information directly into the computer’s memory and works like a Xerox machine is ………………
(a) plotter
(b) scanner
(c) touch screen
(d) trackball
Answer:
(b) scanner

Question 42.
________is a component of Artificial Intelligence.
a)Natural Language Processing
b) Parallel Processing
c) both A and B
d) None of these
Answer:
a)Natural Language Processing

Question 43.
The output device is similar to the upside-down design of a mouse ………………
(a) laser mouse
(b) optical mouse
(c) mechanical mouse
(d) trackball
Answer:
(d) trackball

Question 44,
The term “computer” is derived from the word ________
a) compute
b) calculate
c) process
d) None of these
Answer:
a) compute

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 45.
Which of the following uses biometrics and a unique pattern of retinal blood vessels?
(a) Retinal track
(b) Fingerprint scanner
(c) Optical scanner
(d) Retinal scanner
Answer:
(d) Retinal scanner

Question 46.
Before 19th century, the person who performs calculation is called as ________
a) Computer
b) Calculator
c) Abacus
d) None of these
Answer:
a) Computer

Question 47.
The input device that detects characters printed or written on paper is ………………
(a) Voice input system
(b) Trackball
(c) Optical character reader
(d) 3D mouse
Answer:
(c) Optical character reader

Question 48.
________will not give meaning.
a) information
b) datum
c) data
d) None of these
Answer:
c) data

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 49.
CCD stands for ………………
(a) Code Converting Device
(b) Code Change Device
(c) Change Code Device
(d) Charge-Coupled Device
Answer:
(d) Charge-Coupled Device

Question 50.
________is a processed fact.
a) information
b) datum
c) data
d) None of these
Answer:
a) information

Question 51.
……………… are picture elements.
(a) Picture Point
(b) Monitor
(c) Routers
(d) Pixels
Answer:
(d) Pixels

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 52.
The________is the combination of hardware and software.
a) computer
b) analytical engine
c) calculator
d) all the above
Answer:
a) computer

Question 53.
The ……………… printer uses the same technology used by the photocopier.
(a) Inkjet
(b) dot matrix
(c) line
(d) laser
Answer:
(d) laser

Question 54.
________is the set of programs or instructions.
a) software
b) hardware
c) freeware
d) Malware
Answer:
a) software

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 55.
Printer are of types.
(a) 2
(b) 3
(c) 4
(d) 5
Answer:
(a) 2

Question 56.
Every task given to the computer follows ________ cycle.
a) Input-Process-Output
b) Output-Process-Input
c) Process-Output-Input
d) Input-Output-Process
Answer:
a) Input-Process-Output

Question 57.
Who is considered to be the father of computers?
(a) Charles Babbage
(b) John Von Nuemann
(c) John Napier
(d) Dennis Ritchie
Answer:
(a) Charles Babbage

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 58.
________of a computer interprets and executes software instructions,
a) Input unit
b) Main Memory
c) Central Process Unit
d) Secondary Memory
Answer:
c) Central Process Unit

Question 59.
Who invented ENIAC?
(a) J. Presper Eckert
(b) J. Napier
(c) J. Van Neuman
(d) J. Mauchaley
Answer:
(a) J. Presper Eckert

Question 60.
The CPU has ________components.
a) 4
b) 3
c) 5
d) 2
Answer:
b) 3

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 61.
Which is used as a component of second generation computers?
(a) Vacuum Tubes
(b) Transistor
(c) IC
(d) VLSI
Answer:
(b) Transistor

Question 62.
In ________ unit, various computing functions are performed on data.
a) Control unit
b) ALU
c) Memory unit
d) All the above
Answer:
b) ALU

Question 63.
Expand CPS.
(a) Correction Per Second
(b) Characters Per Second
(c) Calculations Per Second
(d) Cording Per Second
Answer:
(b) Characters Per Second

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 64.
The ________ operations of ALU promote the decision-making ability of a computer.
a) arithmetic
b) logical
c) relational
d) increment/decrement
Answer:
b) logical

Question 65.
Which is the first known calculating device?
(a) Slide rule
(b) Rotating wheel calculator
(c) Abacus
(d) Daisywheel
Answer:
(c) Abacus

Question 66.
The ________ unit controls the flow of data between the CPU, memory, and I/O devices.
a) Control unit
b) ALU
c) Memory unit
d) Ali the above
Answer:
a) Control unit

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 67.
Artificial Intelligence was introduced in which generation of computers?
(a) V
(b) II
(c) III
(d) IV
Answer:
(a) V

Question 68.
The memory is of ________ types
a) 2
b) 3
c) 4
d) 5
Answer:
a) 2

Question 69.
The ________ memory is used to temporarily store the programs and data when the instructions are ready to execute.
a) Primary memory
b) Output unit
c) Secondary memory
d) Ali the above
Answer:
a) Primary memory

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 70.
Identify which is true?
(a) Portable computers were introduced in the fourth generation.
(b) ULSI was used in the fifth generation.
(c) High-level languages were used in IIIrd generations.
(d) All the above statements are true.
Answer:
(d) All the above statements are true.

Question 71.
The ________ memory is volatile.
a) Primary memory
b) Output unit
c) Secondary memory
d) All the above
Answer:
a) Primary memory

Question 72.
OCR stands for ………………
(a) Optimal Compiler Recorder
(b) Optimal Character Recorder
(c) Optimum Charge Recorder
(d) Optimal Character Resolution
Answer:
(b) Optimal Character Recorder

Question 73.
________ is an example of a main memory.
a) ROM
b) PROM
c) RAM
D) EEPROM
Answer:
c) RAM

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 74.
Which is not a hardware component?
(a) Information
(b) Monitor
(c) Motherboard
(d) Keyboard
Answer:
(a) Information

Question 75.
In ________ memory, the content is available even after the power supply is switched off.
a) Primary memory
b) RAM
c) Secondary memory
d) Either A or B
Answer:
c) Secondary memory

Question 76.
Identify the statement which is wrong?
(a) ALU performs addition, subtraction
(b) ALU controls the flow of data between the CPU, memory, and I/O devices
(c) Control unit controls the entire operation of the computer
(d) The logical operation of ALU promotes the decision making
Answer:
(b) ALU controls the flow of data between the CPU, memory, and I/O devices

Question 77.
________ is the most common input device,
a) scanner
b) keyboard
c) bar code reader
d) None of these
Answer:
b) keyboard

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 78.
Which of the following input device scan the book?
(a) OMR
(b) OCR
(c) ECR
(d) OVR
Answer:
(b) OCR

Question 79.
________ is a pointing device.
a) scanner
b) keyboard
c) mouse
d) None of these
Answer:
c) mouse

Question 81.
Which of the following input devices are classified as tactile, ergonomic, gaming?
(a) Keyboard
(b) Printer
(c) Monitor
(d) Mouse
Answer:
(d) Mouse

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 81.
________ device is used to select icons, menus, command buttons or activate something on a computer.
a) scanner
b) keyboard
c) mouse
d) None of these
Answer:
c) mouse

Question 82.
The main advantage of using the light pen is ……………….
(a) easy to use
(b) accurate
(c) easy to detect the characters
(d) drawing directly onto the screen
Answer:
(d) drawing directly onto the screen

Question 83.
________ is a mouse type.
a) Mechanical
b) Optical
c) Laser
d) All the above
Answer:
d) All the above

Question 84.
The individual keys for letters, numbers, and special characters are collectively called ………………. keys.
(a) character
(b) functional
(c) lock
(d) special
Answer:
(a) character

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 85.
The mechanical mouse was developed and introduced in the year ________
a) 1968
b) 1966
c) 1978
d) 1969
Answer:
a) 1968

Question 86.
Wired, wireless and virtual are the categories of ……………….
(a) mouse
(b) keyboard
(c) printer
(d) monitor
Answer:
(b) keyboard

Question 87.
The optical mouse was developed introduced in the year ________
a) 1968
b) 1966
c) 1978
d) 1988
Answer:
d) 1988

Question 88.
Which one of the following are the main characteristics of laser printer?
(a) Speed
(b) Resolution
(c) Reliability
(d) Durability
Answer:
(b) Resolution

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 89.
________ mouse is highly sensitive and able to work on any hard surface.
a) optical
b) mechanical
c) laser
d) all the above
Answer:
c) laser

Question 90.
Expand DPI ……………….
(a) Dots Per Inch
(b) Dark Pen Ink
(c) Dark Page Ink
(d) Double Part ink
Answer:
(a) Dots Per Inch

Question 91.
Who assists Douglas Engel bard to invent moused?
a) Bill English
b) Steve Krish
c) Richard Lyon
d) None of these
Answer:
a) Bill English

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 92.
________ is used to enter the information directly into the computer’s memory.
a) Mouse
b) Scanner
c) Light Pen
d) all the above
Answer:
b) Scanner

Question 93.
The ________ device works like a Xerox machine.
a) Mouse
b) Scanner
c) Light Pen
d) All the above
Answer:
b) Scanner

Question 94.
The______ device Is used for computer security.
a) Fingerprint Scanner
b) Scanner
c) Light Pen
d) All the above
Answer:
a) Fingerprint Scanner

Question 95.
________ device uses biometric technology.
a) Fingerprint Scanner
b) Trackball
c) Light Pen
d) All the above
Answer:
a) Fingerprint Scanner

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 96.
________ scanner uses unique patterns of a person’s retinal blood vessels.
a) Retinal
b) Trackball
c) Light Pen
d) All the above
Answer:
a) Retinal

Question 97.
________ is used to draw directly onto the screen.
a) Mouse
b) Light Pen
c) OCR
d) MICR
Answer:
b) Light Pen

Question 98.
________ is a pointing device.
a) Mouse
b) Light Pen
c) OCR
d) Both A and B
Answer:
d) Both A and B

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 99.
________ is a device which detects characters printed or written on paper.
a) Retinal scanner
b) Light Pen
c) OCR
d) Both A and B
Answer:
c) OCR

Question 100.
The document scanned through_________device can be edited using a word processor.
a) Retinal scanner
b) Light Pen
c) OCR
d) Both A and B
Answer:
c) OCR

Question 101.
A user can scan a page from a book using ________ and can be edited using a word processor.
a) Retinal scanner
b) Light Pen
c) OCR
d) Both A and B
Answer:
c) OCR

Question 102.
The ________ is a two-dimension bar code which can be read by a camera and processed to interpret the image.
a) Retinal scanner
b) Light Pen
c) OCR
d) QRcode
Answer:
d) QRcode

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 103.
The ________ system gives fast and error-free entry of information into the computer.
a) Bar Code
b) Light Pen
c) OCR
d) QR code
Answer:
a) Bar Code

Question 104.
________ serves as a voice input device.
a) Bar Code Reader
b) Microphone
c) OCR
d) QR code reader
Answer:
b) Microphone

Question 105.
________ captures images / videos directly in the digital form.
a) Bar Code Reader
b) Microphone
c) Digital Camera
d) QR code reader
Answer:
c) Digital Camera

Question 106.
________ uses a CCD electronic chip.
a) Bar Code Reader
b) Microphone
c) Digital Camera
d) QR code reader
Answer:
b) Microphone

Question 107.
CCD means ________
a) Charge-Coupled Device
b) Change-Coupled Device
c) Close Circuit Device
d) Charge-Coupled Data
Answer:
a) Charge-Coupled Device

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 108.
________ converts light rays into digital formats.
a) Bar Code Reader
b) Microphone
c) Digital Camera
d) QR code reader
Answer:
b) Microphone

Question 109.
A ________ is a display device that allows the user to interact with a computer by using the finger.
a) Touch Screen
b) Microphone
c) Digital Camera
d) QR code reader
Answer:
a) Touch Screen

Question 110.
________ is an alternative to a mouse or keyboard for navigating a Graphical User Interface.
a) Touch Screen
b) Microphone
c) Digital Camera
d) QR code reader
Answer:
b) Microphone

Question 111.
Touch screen is used on ________ .
a) Smartphone
b) Information kiosks
c) Cash registers
d) All the above
Answer:
d) All the above

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 112.
________ is a device for signaling by hand, by way of pressing one or more switches.
a) Touch Screen
b) Keyer
c) Digital Camera
d) QR code reader
Answer:
b) Keyer

Question 113.
________ number of keys available in Keyer.
a) 4 to 50
b) 4 to 500
c) 14
d) 50
Answer:
a) 4 to 50

Question 114.
In ________ device, the keys are arranged in a cluster.
a) Touch Screen
b) Keyer
c) Digital Camera
d) QR code reader
Answer:
b) Keyer

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 115.
________ is the most commonly used output device to display the information.
a) Plotter
b) Monitor
c) Speaker
d) All the above
Answer:
b) Monitor

Question 116.
Pictures on a monitor are formed with picture elements called. ________
a) Pixels
b) Points
c) Dots
d) None of these
Answer:
a) Pixels

Question 117.
________ is a monitor type.
a) CRT
b) LED
c) LCD
d) All the above
Answer:
d) All the above

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 118.
CRT stands for ________
a) Cathode Ray Tube
b) Carbon Ray Tube
c) Cathode Ray Terminal
d) Cathode Ray Tunnel
Answer:
a) Cathode Ray Tube

Question 119.
LED stands for ________
a) Light Emitting Diodes
b) Light Emitting Device
c) Liquid Emitting Diodes
d) Light. Extracting Device
Answer:
a) Light Emitting Diodes

Question 120.
LCD stands for
a) Liquid Crystal Display
b) Light Crystal Display
c) Large Crystal Display
d) Liquid Circuit Display
Answer:
a) Liquid Crystal Display

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 121.
The monitor works with ________
a) CGA
b) VGA
c) MGA
d) None of these
Answer:
b) VGA

Question 122.
VGA stands for ________
a) Video Graphics Array
b) Video Generation Array
c) Video Graphics Adapter
d) Vector Generation Array
Answer:
a) Video Graphics Array

Question 123.
________ acts as an interface between the computer and display monitor.
a) CGA
b) VGA
c) MGA
d) None of these
Answer:
b) VGA

Question 124.
The first computer monitor was released on ________
a) March 1, 1973
b) March 31, 1973
c) March 21, 1973
d) March 1, 1963
Answer:
a) March 1, 1973

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 125.
The first computer monitor was part of the ________ computer system.
a) Alto Xerox
b) Xerox Alto
c) Xerox
d) Alto
Answer:
b) Xerox Alto

Question 126.
The ________ helps the keyboard to communicate with the screen.
a) Video Graphics Card
b) Video Graphics Channel
c) Video Group Card
d) Video Generation Card
Answer:
a) Video Graphics Card

Question 127.
________ is an output device that is used to produce graphical output on papers.
a) Monitor
b) Plotter
c) Speaker
d) None of these
Answer:
b) Plotter

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 128.
Printers are divided into ________ categories.
a) 2
b) 3
c) 4
d) 5
Answer:
a) 2

Question 129.
________ printers print with striking of hammers or pins on the ribbon.
a) Non-impact
b) Impact
c) plotter
d) None of these
Answer:
b) Impact

Question 130.
________ printer is an impact printer.
a) Dot matrix
b) Line
c) Laser
d) Both A and B
Answer:
c) Laser

Question 131.
A ________ printer prints using a fixed number of pins or wires.
a) Dot matrix
b) Line
c) Laser
d) Both A and B
Answer:
a) Dot matrix

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 132.
The printing speed of a Dot matrix printer is ________ CPS.
a) 300 to 1550
b) 30 to 1550
c) 30 to 1555
d) 30 to 1505
Answer:
b) 30 to 1550

Question 133.
________ printer uses a fixed print head for printing.
a) Dot matrix
b) Line matrix
c) Laser
d) Both A and B
Answer:
b) Line matrix

Question 134.
The printing speed of a Line printer is ________ LPM.
a) Less than 1000
b) More than 1000
c) 300
d) less than 500
Answer:
b) More than 1000

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 135.
CPS stands for-
a) Character Printing Speed
b) Character Per Second
c) Character Per Stroke
d) Character Per Session
Answer:
b) Character Per Second

Question 136.
________ printers do not use striking mechanism for printing.
a) Non-impact
b) Impact
c) Both A and B
d) None of these
Answer:
a) Non-impact

Question 137.
________ printer is a Non-impact printer,
a) Laser
b) Inkjet
c) Line
d) Both A and B
Answer:
d) Both A and B

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 138.
The chief characteristics of laser printer is their ________
a) printing speed
b) resolution
c) cost
d) all the above
Answer:
b) resolution

Question 139.
The resolution of a laser printer is measured in the unit ________
a) LPM
d) None of these
b) Dots Per Instance
d) None of these
Answer:
a) LPM

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 140.
DPI stands for –
a) Dots Per Inch
b) Dots Per Instance
c) Darkness Per Inch
d) None of these
Answer:
a) Dots Per Inch

Question 141.
The available resolution range of a laser printer around _______ DPI.
a) 1024
b) 12000
c) 1200
d) 1020
Answer:
c) 1200

Question 142.
The printing speed of a Laser printer is approximately_______ PPM.
a) 100
b) 1000
c) 1200
d) 1024
Answer:
a) 100

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 143.
Inkjet printer uses_______ colour inks to create colour tones,
a) Magenta
b) Yellow
c) Cyan
d) All the above
Answer:
d) All the above

Question 144.
PPM stands for ._______
a) Paper Per Minute
b) Paper Per Moment
c) Pixels Per Minute
d) None of these
Answer:
a) Paper Per Minute

Question 145.
_______ produces voice output.
a) Plotter
b) Speaker
c) Mic
d) None of these
Answer:
b) Speaker

Question 146.
_______ is used to produce computer output on a big screen.
a) Speaker
b) Plotter
c) Multimedia projector
d) All the above
Answer:
c) Multimedia projector

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 147.
A(n) _______ is the basic software that makes the computer work.
a) Application software
b) Compiler
c) Loader
d) Operating system
Answer:
d) Operating system

Question 148.
POST sequence check the device _______
a) RAM
b) Keyboard
c) Monitor
d) All the above
Answer:
d) All the above

Question 149.
If POST sequence is successful then _______ gets executed.
a) BIOS
b) Application program
c) Compiler
d) None of these
Answer:
a) BIOS

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 150.
BIOS means –
a) Basic Input Output System
b) Basic Input Output Scheme
c) Best Input Output System
d) Beginners Input Output System
Answer:
a) Basic Input Output System

Question 151.
After POST sequence, BIOS gets execute is called _______
a) booting
b) shutdown
c) hibernate
d) login
Answer:
a) booting

Question 152.
Booting process is of _______ types,
a) 5
b) 4
c) 3
d) 2
Answer:
d) 2

Question 153.
When the system starts from the initial state when the computer is switched on is called_______ booting.
a) Warm
b) Cold
c) Hard
d) Either B or C
Answer:
b) Cold

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 154.
When the user presses the power button, the instructions are read from the _______ to initiate the booting process.
a) RAM
b) CD-RAM
c) Hard disk
d) ROM
Answer:
d) ROM

Question 155.
When the system restarts or when the Reset button is pressed_______ booting initiated.
a) Warm
b) Soft
c) Hard
d) Either A or B
Answer:
d) Either A or B

Question 156.
During _______ booting, there are chances of data loss and system damage as the data might not have been stored properly.
a) Warm
b) Soft
c) Hard
d) Either A or B
Answer:
d) Either A or B

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 157.
_________interprets and executes software instructions.
a) ALU
b) CPU
c) Cache memory
d) None of these
Answer:
b) CPU

Question 158.
There are totally_______ Symbols /Graphemes / Characters in the Indus Script.
a) 417
b) 407
c) 471
d) 147
Answer:
a) 417

Question 159.
_______ is a sub-field of Artificial Intelligence,
a) Neural Network
b) Nature Network
c) GUI
d) None of these
Answer:
a) Neural Network

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 160.
Expand USB
a) Universal Serial Bus
b) Unique Serial Bus
c) Universal Serial Board
d) Universal Serial Booting
Answer:
a) Universal Serial Bus

Question 161.
Transistor means _______
a) Transfer resistance
b) Transfer register
c) Track resistance
d) Tangent resistance
Answer:
a) Transfer resistance

Question 162.
LPM stands for_______
a) Lines Per Minute
b) Lines Per Moment
c) Line Print Machine
d) Line Print Mechanism
Answer:
a) Lines Per Minute

Short Answer Questions.

Question 1.
Expand ANN, OCR
Answer:
ANN – Artificial Neural networks; OCR – Optical Character Recognition.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 2.
Write a note on ENIAC.
Answer:
The ENIAC (Electronic Numerical Integrator And Calculator) was invented by 1 Presper Eckert and John Mauchly at the University of Pennsylvania and began construction in 1943 and was not completed until 1946. It occupied about 1,800 square feet and used about 18,000 vacuum tubes, weighing almost 50 tons. ENIAC was the first digital computer because it was fully functional.

Question 3.
What are the advantages and disadvantages of light pen?
Answer:

  1. Advantage: Drawing directly on to the screen.
  2. Disadvantage: Hard to use and not accurate.

Question 4.
Define Data.
Answer:
Data is defined as an un-processed collection of raw facts, suitable for communication, interpretation, or processing.

Question 5.
Name some mouse actions.
Answer:
Move, click, double click, right-click, drag, and drop are some of the mouse actions.

Question 6.
Define Hardware.
Answer:
Hardware is the physical component of a computer like a motherboard, memory devices, monitor, keyboard, etc.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 7.
What is NLP?
Answer:
NLP stands for Natural Language Processing which is a component of Artificial Intelligence (AI). It provides the ability to develop a computer program to understand human language.

Question 8.
Write a note on the IPO cycle.
Answer:
Every task given to a computer follows an Input- Process- Output Cycle (IPO cycle). It needs certain input, processes that input, and produces the desired output. The input unit takes the input, the central processing unit does the processing of data and the output unit produces the output.

Question 9.
Write note on Input unit.
Answer:
Input unit is used to feed any form of data to the computer, which can be stored in the memory unit for further processing. Example: Keyboard, mouse, etc.

Question 10.
Write note on output unit.
Answer:
An Output Unit is any hardware component that conveys information to users in an understandable form. Example: Monitor, Printer etc.

Question 11.
Write note on primary memory.
Answer:
The primary memory is volatile, that is, the content is lost when the power supply is switched off. Ex. Random Access Memory (RAM),

Question 12.
Write note on secondary memory.
Answer:
The secondary memory is non-volatile, that is, the content is available even after the power supply is switched off. Ex. Hard disk, CD-ROM, DVD ROM etc.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 13.
Who invented Mouse?
Answer:
The computer mouse was invented and developed by Douglas Engelbart, with the assistance of Bill English, during the 1960’s and was patented on November 17, 1970.

Question 14.
What is the use of a scanner?
Answer:
Scanners are used to enter the information directly into the computer’s memory. This device works like a Xerox machine. The scanner converts any type of printed or written Information including photographs into a digital format, which can be manipulated by the computer.

Question 15.
What are the types of keyboards?
Answer:
The keyboard types are:

  1. Wired keyboard.
  2. Wireless keyboard.
  3. Virtual keyboard.

Question 16.
Write a short note on Trackball.
Answer:
Track bail is similar to the upside-down design of the mouse. The user moves the ball directly, while the device itself remains stationary. The user spins the bail-in various directions to navigate the screen movements.

Question 17.
What is the use of a Retinal scanner?
Answer:
This performs a retinal scan which is a biometric technique that uses unique patterns on a person s retinal blood vessels.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 18.
Write short note on Barcode reader.
Answer:
A Bar code is a pattern printed in lines of different thickness. The Bar code reader scans the information on the bar codes transmits to the Computer for further processing. The system gives fast and error-free entry of information into the computer.

Question 19.
Write short note on QR code reader.
Answer:
The QR (Quick response) code is the two-dimension bar code which can be read by a camera and processed to interpret the image.

Question 20.
What is the use of a Voice Input System?
Answer:
The microphone serves as a voice Input device. It captures the voice data and sends it to the computer. Using the microphone along with speech recognition software can offer a completely new approach to input information into the Computer,

Question 21.
Write a short note on Digital Camera.
Answer:
It captures images/videos directly in digital form. It uses a CCD (Charge Coupled Device) electronic chip. When light falls on the chip through the lens, it converts light rays into digital format.

Question 22.
Write about Plotter.
Answer:
The plotter is an output device that is used to produce graphical output on papers. It uses single color or multi-color pens to draw pictures,

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 23.
Write a short note on the printer.
Answer:
Printers are used to print the information on paper.
Printers are divided into two main categories:

  • Impact Printers,
  • Non Impact printers.

Question 24.
Write about Multimedia Projectors.
Answer:
Multimedia projectors are used to produce computer output on a big screen. These are used to display presentations in meeting halls or in classrooms.

Question 25.
What do you mean by natural language processing?
Answer:
It is a method used in artificial intelligence to process and derive meaning from the human language.

Question 26.
Write about Robotics.
Answer:
Robot is a term coined by Karel Capek ¡n 1921 to play RUR (Rossurn’s Universal Robots). It is used to describe a computerized machine designed to respond to input received manually or from its surroundings.

Question 27.
Write note on Nanotechnology.
Answer:
Nanotechnology is an engineering, science and technology that develops machines or works with one atom or one molecule that is 100 nanometers or smaller.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 28.
Write note on Bioengineering.
Answer:
It is a discipline that applies engineering principles of design and analysis to biological systems and biomedical technologies.

Question 29.
What is high-level language?
Answer:
A high-level language is a computer programming language that is not limited by the computer, designed for a specific job and is easier to understand.

Question 30.
Write, about Integrated Circuits.
Answer:
The integrated circuit is a package containing many circuits, pathways, transistors, and other electronic components all working together to perform a particular function or a series of functions.

Question 31.
Write note on the punched card.
Answer:
It is also known as a Hollerith card is a paper card containing several punched or perforated holes that were punched by hand or machine to represent data.

Explain in brief

Question 1.
Differentiate warm booting and cold booting?
Answer:
Cold Booting:
When the system starts from initial state i.e. it is switched on, we call it cold booting or Hard Booting. When the user presses the Power button, the instructions are read from the ROM to initiate the booting process.

Warm Booting:
When the system restarts or when Reset button is pressed, we call it Warm Booting or Soft Booting. The system does not start from initial state and so all diagnostic tests need not be carried out in this case. There are chances of data loss and system damage as the data might not have been stored properly.

Question 2.
What is the purpose of the Fingerprint scanner?
Answer:
Fingerprint Scanner is a fingerprint recognition device used for computer security, equipped with the fingerprint recognition feature that uses biometric technology. Fingerprint Reader / Scanner is a very safe and convenient device for security instead of using passwords, which is vulnerable to fraud and is hard to remember.

Question 3.
Define Keyer?
Answer:
A Keyer is a device for signaling by hand, by way of pressing one or more switches. Modem keyers have a large number of switches but not as many as a full-size keyboard. Typically, this number is between 4 and 50. A keyer differs from a keyboard, which has “no board”, but the keys are arranged in a cluster.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 4.
What is the purpose of Optical Character Reader?
Answer:
It is a device which detects characters printed or written on a paper with OCR, a user can scan a page from a book. The Computer will recognize the characters on the page as letters and punctuation marks and stores them. The Scanned document can be edited using a word processor.

Question 5.
List out the input and output devices of a computer?
Answer:
Input Devices:

  1. Keyboard
  2. Mouse
  3. Scanner
  4. Fingerprint Scanner
  5. Track Ball
  6. Retinal Scanner
  7. Light Pen
  8. Optical Character Reader
  9. Bar Code / QR Code Reader
  10. Voice Input Systems
  11. Digital Camera
  12. Touch Screen
  13. Keyer

Output Devices:

  1. Monitor
  2. Plotter
  3. Printers

Question 6.
Write about Keyer.
Answer:
A Keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers have a large number of switches but not as many as a full-size keyboard. Typically, this number is between 4 and 50. A keyer differs from a keyboard, which has “no board”, but the keys are arranged in a cluster.

Question 7.
Explain fingerprint scanner and retinal scanner?
Answer:
Fingerprint Scanner:
Fingerprint Scanner is a fingerprint recognition device used for computer security, equipped with the fingerprint recognition feature that uses biometric technology. Fingerprint Reader / Scanner is a very safe and convenient device for security instead of using passwords, which is vulnerable to fraud and is hard to remember.

Retinal Scanner: This performs a retinal scan which is a biometric technique that uses unique patterns on a person’s retinal blood vessels.

Question 8.
Write about the speaker? Where it is mostly used?
Answer:
Speakers produce voice output (audio). Using a speaker along with speech synthesis software, the computer can provide voice output. This has become very common in places like airlines, schools, banks, railway stations, etc.

Question 9.
Compare assembly language and machine language.
Answer:
An assembly language is a low-level programming language.
Machine language is a collection of binary digits or bits that the computer reads and interprets directly.

Question 10.
Write a note on

  1. Transistor
  2. Vacuum tube

Answer:

  1. Transistor: The transistor (transfer resistance) is made up of semiconductors. It is a component used to control the amount of current or voltage used for amplification/modulation of an electronic signal.
  2. Vacuum Tube: It contains electrodes for controlling electron flow and was used in early computers as a switch or an amplifier.

Explain in detail

Question 1.
Explain the types of Mouse.
Answer:
Different types of mouse available are: Mechanical Mouse, Optical, Laser Mouse, Air Mouse, 3D Mouse, Tactile Mouse, Ergonomic Mouse and Gaming Mouse.

Question 2.
Explain input devices of a computer?
Input Devices:
Keyboard : Keyboard (wired / wireless, virtual) is the most common input device used today. The individual keys for letters, numbers and special characters are collectively known as character keys. This keyboard layout is derived from the keyboard of original typewriter.

Mouse:
Mouse (wired/wireless) is a pointing device used to control the movement of the cursor on the display screen.

Types of Mouses:

  1. Mechanical Mouse
  2. Optical Mouse.
  3. Laser Mouse

Scanner : Scanners are used to enter the information directly into the computer’s memory. This device works like a Xerox machine. The scanner converts any type of printed or written information including photographs into a digital format, which can be manipulated by the computer.

Track Ball : Track ball is similar to the upside – down design of the mouse. The user moves the ball directly, while the device itself remains stationary. The user spins the ball in various directions to navigate the screen movements.

Retinal Scanner : This performs a retinal scan which is a biometric technique that uses unique patterns on a person’s retinal blood vessels.

Light Pen : A light pen is a pointing device shaped like a pen and is connected to a monitor. The tip of the light pen contains a light-sensitive element which detects the light from the screen enabling the computer to identify the location of the pen on the screen. Light pens have the advantage of ‘drawing’ directly onto the screen, but this becomes hard to use, and is also not accurate.

Optical Character Reader : It is a device which detects characters printed or written on a paper with OCR, a user can scan a page from a book. The Computer will recognize the characters in the page as letters and punctuation marks and stores. The Scanned document can be edited using a word processor.

Bar Code / QR Code Reader : A Bar code is a pattern printed in lines of different thickness. The Bar code reader scans the information on the bar codes transmits to the Computer for further processing. The system gives fast and error free entry of information into the computer.

QR (Quick Response) Code: The QR code is the two dimensional bar code which can be read by a camera and processed to interpret the image

Voice Input Systems: The microphone serves as a voice Input device. It captures the voice data and sends it to the Computer. Using the microphone along with speech recognition software can offer a completely new approach to input information into the Computer.

Digital Camera: It captures images/videos directly in the digital form. It uses a CCD (Charge Coupled Device) electronic chip. When light falls on the chip through the lens, it converts light rays into digital format.

Touch Screen: A touch screen is a display device that allows the user to interact with a computer by using the finger. It can be quite useful as an alternative to a mouse or keyboard for navigating a Graphical User Interface (GUI). Touch screens are used on a wide variety of devices such as computers, laptops, monitors, smartphones, tablets, cash registers, and information kiosks. Some touch screens use a grid of infrared beams to sense the presence of a finger instead of utilizing touch-sensitive input.

Keyer: A Keyer is a device for signaling by hand, by way of pressing one or more switches. Modem keyers have a large number of switches but not as many as a full-size keyboard. Typically, this number is between 4 and 50.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

Question 3.
Explain briefly about non-impact printers.
Answer:
These printers do not use striking mechanism for printing. They use electrostatic or laser technology. Quality and speed of these printers are better than Impact printers. Ex: Laser printers and Inkjet printers.

Laser Printers :
Laser printers mostly work with similar technology used by photocopiers. It makes a laser beam scan back and forth across a drum inside the printer, building up a pattern. It can produce very good quality of graphic images. One of the chief characteristics of laser printer is their resolution – how many Dots per inch (DPI). The available resolution range around 1200 dpi. Approximately it can print 100 pages per minute (PPM).

Inkjet Printers:
Inkjet Printers use colour cartridges which combined Magenta, Yellow and Cyan inks to create color tones. A black cartridge is also used for monochrome output. Inkjet printers work by spraying ionized ink on a sheet of paper. The speed of Inkjet printers generaly range from 1-20 PPM (Page Per Minute).
They use the technology of firing ink by heating it so that it explodes towards the paper in bubbles or by using piezoelectricity in which tiny electric currents controlled by electronic circuits are used inside the printer to spread ink in jet speed) An Inkjet printer can spread millions of dots of ink at the paper every single second.

Samacheer Kalvi 11th Computer Science Guide Chapter 1 Introduction to Computers

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