Question

notes of computer applications class 9 chapter 4 operating system​

Answer 1

Correct option is

C

21+21i

Let z=x+iy be multiplication inverse of 1−i

then we must have 

(x+iy)(1−i)=1

x−ix+iy+y=1

x+y=1 and x−y=0

put x=y we have x=y

2y=1     y=21,x=21

Hence z=x+iy=21+2i

Answer 2

Answer:

CLS 6

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9

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12

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CBSE Notes for Class 9 Foundation of Information Technology – Operating System

CBSE Notes for Class 9 Foundation of Information Technology – Operating System

Operating system is the most important program that is required by the computer to communicate with the user and other hardware devices (peripherals) attached to it. An operating system is also a platform that decides the types of applications that can be run on a computer.

CBSE Notes for Class 9 Foundation of Information Technology - Operating System 1

An operating system is a system software which acts as an interface between the user and the computer.

Explanation:

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