CLASS - IX
SUBJECT : INFORMATION TECHNOLOGY
CHAPTER – 3 ( Basic ICT Skills )
Workheet-2
1. Give full form of the following:
a. ALU
b. CU
c. CPU
Answer : ALU is Arithmetic and Logic Unit.
CU is Control Unit
CPU is Central Processing Unit
2. Name the unit of computer that controls the flow of data from input device to memory.
Answer: The control unit is the unit which controls the flow of data from the input devices to memory.
3. Name logical operations that can be performed in ALU.
Answer: The ALU also performs the following logical operations:
< (less than)
<= (less than or equal to)
>= (greater than or equal to)
<> (not equal to)
4. Identify the following arithmetic operations: a. * b. ^ c. /.
Answer: a) *(multiplication)
b) /(Division)
c) ^(Exponent)
5. Which unit of computer is called the brain of the computer?
Answer: Central Processing Unit is the unit of computer which is called the brain of the
computer.
6. Identify as hardware or software. Monitor, MS Word, Operating system, Mouse, Keyboard, MS PowerPoint.
Answer:
Hardware : Monitor, Mouse, Keyboard
Software : MS Word, Operating system, MS PowerPoint.
7. Differentiate between hardware and software.
Answer: Computer hardware – Physical parts of a computer such as Input devices, output devices, central processing unit and storage devices are called computer hardware.
Computer software – Software are the programs or applications that run on computer. For example, MS Word, MS PowerPoint, Operating systems, etc.
8. What is the difference between data and information.
Answer: Data: Data refers to raw facts and figures. For example, 123, “English”, etc. Information: Information refers to processed data. For example, total marks and percentage of a student.
9. Name the unit of computer where arithmetic operations are performed.
Answer: Arithmetic and Logic Unit is the unit of computer where arithmetic operations are performed.
10. Name any three input devices.
Answer: Keyboard
Mouse
Joystick