CBSE SOLUTIONS-2025-26
CLASS-7
CHAPTER-6 Computer Viruses
A. Tick the correct answer:
Q1. A virus can infect –
a. Monitor b. Keyboard c. Mouse d. MS Word
Answer: MS Word
Q2. Program viruses infect program files with extensions such as –
a. .com b. .exe c. .sys d. All of these
Answer: All of these (.com, .exe, .sys)
Q3. Which of the following is not a type of malware?
a. Worm b. McAfee c. Spyware d. Trojan Horse
Answer: McAfee
Q4. Which virus infects the boot record or master boot record?
a. Worm b. Malware c. Boot virus d. Spyware
Answer: Boot virus
Q5. Which of the following is not an antivirus software?
a. Avast b. Avira c. Norton d. Trojan
Answer: Trojan
B. True or False
Q1. We should scan pendrive for viruses before using them.
Answer: True
Q2. A virus can infect both hardware and software.
Answer: False
Q3. Malware also steals important information.
Answer: True
Q4. Viruses have no effect on the speed of computer.
Answer: False
Q5. Viruses enter through infected storage devices.
Answer: True
C. Fill in the blanks
Q1. A computer virus ______ the normal operation of computer.
Answer: disturbs
Q2. ______ programs are designed to detect and remove viruses from computer system.
Answer: Antivirus
Q3. ______ can consume a lot of memory, making the computer very slow and difficult to work with.
Answer: Worms
Q4. A computer virus causes loss of ______ and ______ of data.
Answer: data, corruption
Q5. Virus programs are ______.
Answer: harmful
D. Answer the following questions
Q1. What is a computer virus? Name its types.
Answer:
A computer virus is a type of malicious software program designed to disrupt the normal functioning of a computer, damage data, or steal information.
Types of viruses: Boot virus, Program/file virus, Macro virus, Worms, Trojan horse, Spyware.
Q2. What is antivirus software? Give some examples of antivirus software.
Answer:
Antivirus software is a program designed to detect, prevent, and remove computer viruses and other malicious software.
Examples: Avast, Norton, McAfee, Avira, Quick Heal, Kaspersky.
Q3. What do you mean by Trojan horse?
Answer:
A Trojan horse is a type of malware that looks like a useful or legitimate program but secretly performs harmful activities such as stealing data or giving hackers access to the computer.
Q4. Explain the term spyware.
Answer:
Spyware is a type of malware that secretly monitors a user’s activities, collects personal information such as passwords, browsing history, or bank details, and sends it to hackers.
Q5. What can a computer virus do to your computer?
Answer:
A computer virus can:
1. Slow down the performance of the computer
2. Delete or corrupt important files
3. Steal personal and sensitive information
4. Damage operating system files
5. Cause frequent crashes and data loss
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