💻 COMPUTISM LAB CLASS 7 — COMPLETE SOLUTION

Section A — Fill in the Blanks

1. SMPS stands for Switched-Mode Power Supply.
2. A modem converts digital data into analog signals.
3. The main circuit board of a computer system is called the motherboard.
4. RAM stands for Random Access Memory.
5. The octal number system consists of 8 digits with the base 8.
6. The hexadecimal number system includes digits from 0 to 9 and letters from A to F.
7. The term VIRUS stands for Vital Information Resources Under Siege.
8. A sector virus infects the boot sector of a hard drive.
9. The tag used to insert an image in an HTML web page is <img>.
10. Every HTML form uses a <form> element which begins the form structure.

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Section B — Multiple Choice Questions

The paper contains 20 MCQs covering hardware, number systems, viruses and HTML.

No.	Correct Answer
1	a. Central Processing Unit
2	c. RAM
3	b. Scanner
4	c. Output
5	a. Impact printer
6	c. 16
7	b. 1010
8	a. 4D2
9	c. 2
10	b. 12
11	b. Virus
12	b. Sweeper
13	c. Worm
14	b. <tr>
15	a. Choose multiple options
16	c. <caption>
17	a. border-collapse: collapse;
18	b. src
19	b. <ol>
20	b. <a> (Anchor tag)

Important explanations

Q7. Decimal 10 → Binary

10 ÷ 2 = 5 remainder 0
5 ÷ 2 = 2 remainder 1
2 ÷ 2 = 1 remainder 0
1 ÷ 2 = 0 remainder 1

Reading from bottom to top:

10₁₀ = 1010₂

Q10. Hexadecimal C

Hexadecimal values are:

A = 10
B = 11
C = 12
D = 13
E = 14
F = 15

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Section C — Assertion-Based MCQs

There are 10 assertion/reason questions in this section.

1. RAM

Assertion: RAM is known as a volatile memory.
Reason: Information stored in RAM is lost when you turn off the computer or power goes off.

✅ Answer: a. Both A and R are true, and R is the correct explanation of A.

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2. ROM

Assertion: ROM is a non-volatile memory.
Reason: ROM retains stored information even when the power has been switched off.

✅ Answer: a. Both A and R are true, and R is the correct explanation of A.

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3. Binary Number System

Assertion: The binary number system uses base 2.
Reason: Binary number system consists of ten digits from 0 to 9.

✅ Answer: b. A is true, but R is false.

Explanation: Binary uses only 0 and 1.

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4. Virus and Flash Drive

Assertion: A computer virus can spread via removable storage devices like flash drives.
Reason: Flash drives can carry malicious files and execute AutoRun code to compromise host machines.

✅ Answer: a. Both A and R are true, and R is the correct explanation of A.

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5. Antivirus Updates

Assertion: Antivirus software updates its virus database frequently.
Reason: Frequent updates ensure the system can detect new and different types of virus threats effectively.

✅ Answer: a. Both A and R are true, and R is the correct explanation of A.

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6. Computer Worm

Assertion: A computer worm is a self-replicating program that can travel without human action.
Reason: Unlike viruses, worms do not consume network bandwidth or memory.

✅ Answer: b. A is true, but R is false.

Explanation: Worms can consume network bandwidth, memory and other system resources.

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7. <img> Tag

Assertion: The <img> tag requires a closing tag like </img> in HTML.
Reason: The <img> tag is an empty tag used to add images to a web page.

✅ Answer: c. A is false, but R is true.

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8. HTML Form

Assertion: The action attribute in an HTML form specifies the file or script the form is submitted to.
Reason: The method attribute specifies how the form information is posted (GET or POST).

✅ Answer: a. Both A and R are true, and R is related to form submission settings.

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9. Octal Number System

Assertion: Octal number system consists of 8 digits with the base 8.
Reason: Octal system takes binary digits in groups of three to make binary more compact.

✅ Answer: a. Both A and R are true, and R explains the reason behind the octal system.

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10. Real-Time Antivirus Scan

Assertion: Real-time scan in antivirus software runs continuously in the background.
Reason: Real-time scan provides maximum protection by screening opened or saved files for security risks.

✅ Answer: a. Both A and R are true, and R is the correct explanation of A.

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Section D — True or False

The following are the 10 statements given in the paper.

No.	Statement	Answer
1	RAM stores information permanently.	❌ False
2	A digital camera is classified as an output device.	❌ False
3	Binary numbers use digits from 0 to 7.	❌ False
4	The binary system is the most commonly used number system by digital computers.	✅ True
5	Data is an important asset for an organisation or individual.	✅ True
6	Viruses cannot be sent as executable files (.exe) with email attachments.	❌ False
7	A computer worm can travel without any human action.	✅ True
8	The <img> tag must always be closed with </img>.	❌ False
9	External links lead to a different website or web page.	✅ True
10	The border-spacing property is used to change the distance between table cells.	✅ True