CBSE Class 7 Revision Assignment Set D

CBSE Class 7 Revision Assignment (4)

Chapter wise assignments are being given by teachers to students to make them understand the chapter concepts. Its extremely critical for all CBSE students to practice all assignments which will help them in gaining better marks in examinations. All assignments available for free download on the website are developed by the best teachers having many years of teaching experience in CBSE schools all over the country. Students, teachers and parents are advised to download the CBSE study material.

Holiday Assignment

Reading Skill

Computer Viruses

A computer virus is a small programme that is written to copy itself into other computer files. It gets executed automatically whenever the infected file is used and destroys data and other programmes residing in the computer’s storage media. (floppy-disks, hard disks, CD’s, pen drives, etc).

A computer virus normally attaches itself to other computer programmes and becomes part of them. A virus programme is written in such a way that it situates itself into the computer’s memory and gets executed automatically. Then it copies the virus instructions into all the other programmes that are being executed on that computer. This activity or process, in computer terms, is called “infecting” the system and the files. The infection can then spread to other computers through floppy disks, memory storage devices, computer networks, emails, the Internet and other online systems. Some viruses are harmless as they display jokes or messages on the screen without damaging the system. On the other hand, viruses can cause crashes (destroying data and programmes) and even a large computer system within a few minutes.

1. Answer these questions.

a. What is a computer virus?

b. What harm does it do to the computer?

c. How does the virus infect the computer?

2. Find words from the passage which mean the same as:

a. carried out .......................................

b. information .......................................

Don’t Take English for Granted

English is the most widely used language in the world. One in every seven human beings can speak English. English has the largest vocabulary, perhaps as many as two million words. English is also a crazy language. There is no egg in eggplant neither pine nor apple in pineapple

 

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