chapter 9
Protecting your computer
1. d. all of these (slow processing
speed, loss of data, reduced disk
space)
2. b. Mcafee
3. b. acid rain
4. d. Both a. and b.
(quarantining, repairing)
5. b. program virus
B. Fill in the blanks
1. Malware
2. deletes or modifies
3. boot sector
4. program
5. ransomware
true / false
1. TRUE
2. FALSE
3. TRUE
4. TRUE
5. FALSE
SHORT ANSER QUESTIONS
1. Antivirus software is a program
that detects and removes viruses and
other malware from the computer.
Example- Avira, AVG, Bitdefender etc.
2. Ransomware is a malware designed
to lock a system or a network and
deny access to them until a ransom
is paid. It spreads throughout the
system including the storage devices.
Whereas a worm is a program that
replicates itself from one system to
another over a network. Worm does not
need a host program to run. Worms are
designed only to spread from one
system to another without causing
any harm to the system files.
They replicate in large numbers to
consume disk space or system memory.
LONG
1. What do you understand by the term
malware and what are the ways in
which it spreads?
ans- A malware is a malicious program
designed in such a way to damage
computer files, disrupt the data
stored in it or steal important
information from the hard disk.
Malware spreads in the following ways-
1. By using an infected pen drive, CD
or DVD.
2. Through email attachments
3. By downloading or installing
software/file infected with malware.
4. Clicking on any unkown link that
has malware while surfing the internet
Q2. Write short note of the following
a. Macro virus
b. Stealth virus
c. Trojan horse
Q3. Explain three actions performed
by an antivirus software.
Ans3. Following are the common action
performed by an antivirus software
1. Quarantine- Quarantine means to
isolate an infected file so that it
cannot harm other files.
2. Repair- The antivirus tries to
remove the virus code and repairs
the infected file to restore it to
its original form.
3. Delete- When a file is damaged or
infected beyond repair, then an
antivirus deletes it.
Q4. Differentiate between spam and
adware.
Ans4. Adware displays or directs the
users to an advertisement, while
spyware performs espionage on the
computer`s activity.
• Adware operates visible to the user,
while the Spyware operates hidden.
• Generally adware does not pose
a threat to the security of the
computer or user information,
while spyware does and are
categorized as malicious software.
Q5. Differentiate between a virus
and a worm.
ANS5.(1) Worms usually spread using a
computer network, whereas viruses
use executable files to spread from
one system to others.
(2) Worms can automatically replicate to
different systems, while viruses
require human action to replicate.
(3)The spreading speed of viruses is
comparatively slower than worms.
Because worms can replicate
automatically, they spread at a much
faster speed.
Q6. List four tips to keep your
computer system safe from malware.
Ans6. Best practices to keep computer
safe are:-
i. Install an antivirus sofware.
ii. Scan the computer from time to
time.
iii. Scan the pen drive or other
external hard drives before attaching
them to the computer.
iv. Do not open emails from an
unkonwn source.
v. Scan a software before downloading
or installing it from the internet.
CLASS 7
INTRODUCTION TO HTML 5
A TICK THE CORRECT OPTION:-
11 D. <HR> AND <BR>
22 B <TITLE>
33 D
NOTEPAD AND WORDPAD
44 A <H1>
55 A
<B>
B. Fill in the
blanks
11 Hypertext
22 Container and Empty
33 HTML 5
44 HEAD
55 BODY
11 <TITLE>
The title
element is used to tell the browser that the text within <TITLE> and </TITLE>
tags is the title of the webpage. The Title tag appears on the title bar of the
browser.
2. <h3> The HTML <h3> tag
defines the third level heading in the HTML document. This tag is
also commonly referred to as the <h3> element.
3.
<BR> The <br> HTML element produces a line break in text. It is
useful for writing a poem or an address where the division of lines is
significant.
4. <i>
To
display a part of the text in the italic form on the browser, the HTML
<i> tag is used.
5. <HTML>
The html element is used to tell the browser that the
document is HTML document. Every webpage code must start with <HTML> and
end with </HTML>.
6. <Img> Tag is used to insert
image in a webpage. The <Img> tag is an empty element and creates space
for the image to be inserted.
SHORT ANSWER QUESTIONS-
1. The <p> element is used to mark
a new paragraph. It is a container tag starting with <p> and ending with
</p>.
2. Example of container tags are
1. Paragraph tag <p>..</p>
2. Italics tag <i>…….</i>
Ans3. The
line break <br> tag is used to give a line break. The text written after
this tag appears on a new line. It is an empty tag.
Ans4. Hypertext refers to a word,
phrase or chunk of text that can be linked to another document or text.
Hypertext covers both textual hyperlinks and graphical ones
Ans5- The <!—text --> tag is used to insert comments in
the HTML code. Comments help in code explanation. Comment text is not displayed
in the browser. This is an empty element.
ANS6 CONTAINER AND EMPTY ELEMENT Page 106
