Grade IV, Chapter 2

 

Learn with Hafiza Palwasha

OXFORD (Book 4), KEYBOARD
Computer Science With Application Software (Third Edition).

Solution

Chapter No. 2

Input and Output Devices

NEW WORDS

Write these new words on neat copies. There is no need to memorize these words but students should be able to read and understand these words as I explained and discussed in class.

1.    Enter data

2.    Displays

3.    Cabinet

4.    Central Processing Unit (CPU)

5.    Printer

6.    Scanner

7.    Microphone

8.    Devices

9.    Input devices

10.  Output devices

11.  Together

12.  Computer peripherals

13.  Instructions

14.  Commonly

15.  Text

16.  Typewriter

17.  Keys

18.  Function keys

19.  Various operations

20.  Perform

21.  Scroll wheel

22.  Clicked

23.  Double-clicked

24.  Right-clicked

25.  Trackball

26.  Rolled

27.  Pointer

28.  Screen

29.  Joystick

30.  Easier

31.  Control

32.  Light pen

33.  Drawing objects

34.  Pointing

35.  Engineers

36.  Architects

37.  Designers

38.  Scanner

39.  Scan

40.  Transfer photos

41.  Hand-drawn pictures

42.  Web camera

43.  Webcam

44.  Camera

45.  Built-in

46.  Viewed

47.  Video chatting

48.  Videoconferencing

49.  Digital camera

50.  Digicam

51.  Digital form

52.  Immediately

53.  Liquid Crystal Display (LCD)

54.  Memory device

55.  Microphone

56.  Voice recognition computer system

57.  Pronounces

58.  Speech patterns

59.  Soft copy

60.  Speakers

61.  Headphones

62.  Earphones

63.  Headset

64.  Projectors

65.  Presentations

66.  Printer

67.  Hard copy

68.  Dot matrix printers

69.  Inkjet printers

70.  Laser printers

Exercise

Solution

Page No. 14

Objective Type Questions

Q No. 1: Choose the correct option.

Solution:

a.   A device used to take the output on paper.

       i. Printer (is correct)

b.   An input device used to take video with sound and still photographs.

      ii. Digital camera (is correct)

c.   It reads and scans text and pictures directly into the computer.

      iii. Scanner (is correct)

d.   Which of these is a pointing device?

      i. Mouse (is correct)

e.   The output on a monitor is called

      i. Softcopy (is correct)

Page No. 15

Descriptive Type Questions

Q No. 1: Answer the following.

a. Differentiate between hard copy and soft copy.

Answer: Both are the types of output. Hardcopy is touchable and gives output on the paper while softcopy is untouchable and gives output on the screen.

b. What is an output device? Name any three output devices.

Answer: Output devices are the devices which are use to see the output generated by computer or any machine.

Three output devices are:

1. Monitor

2. Printer

3. Speaker

c. List four different pieces of computer hardware found in your school's computer lab. Are they all essential components? Justify your answer.

Answer: Four different pieces of hardware found in my school's computer lab are:

1. Monitor

2. Keyboard

3. Mouse

4. Central Processing Unit (CPU)

1. Monitor: Monitor is use to display data.

2. Keyboard: Keyboard is use for typing or entering the data.

3. Mouse: Mouse is use for pointing on the screen.

4. CPU: CPU is use to process the data.

d. An architect is designing the floorplan of a house. Which do you think is the best input device to use for this task? Will he need more than one type of input device?

Answer: A light pen is the best input device to design the floor plan of a house. He does need any other input device. It is easier to draw with light pen as compare to mouse because:

1. It is smooth

2. Easy and flexible to use.

3. It draws directly on screen.

e. Cameras are often an integral part of a computer, especially a laptop or hand held device. What are the advantages and disadvantages of having a camera within a computer? Give examples to illustrate your response.

Answer: Following the points: 

1. We use built-in camera for video chatting but it may drop the signals quickly as compare to the audio call.

2. By the facility of built-in cameras, online classes are possible which enhance distance learning but it may loose the discipline.

3. By placing computers having built-in cameras in public places supports to monitor the public activities but it's placement increase the cost.

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