Date : 25/08/25 (Monday)
Class : STD IV (International)
Section : Phoenix
Subject : Computer Science
Topic : Introduction to computer
Chapter-1, page-17
CW # 4
Teacher : Toufiqur Rahman
Discussion, fill in the blanks
➢ Points to be discussed:
1. Output device
2. Monitor
3. Types of monitor
4. Printer
5. Types of printer
Fill in the blanks:
1. In Abacus the wires represent the ________.
2. Pascal’s mechanical calculator was later
improved by ________.
3. Another name of the special keys of the
keyboard is _________ keys.
4. There are ________ Shift keys on the
keyboard.
5. The three main buttons of a standard mouse are
the left, right button and the ________ wheel.
6. Cordless mouse connects to a computer
without any ________.
7. OCR scans ________ optically character by
character.
8. Monitor is an ________ device.
9. The full form of CRT is ________ Ray
Tube.
10.LCD monitors do minimum consumption of
________.
11.A printer is used to print information on
________.
12.There are ________ types of impact
printers.
Answers:
1. columns
2. Gottfried
3. function
4. 2
5. scroll
6. wire
7. text
8. output
9. Cathode
10.electricity
11.paper
12.2