Computer Science
Multiple Choice
Questions
(MCQs) – Sets 25
with Detailed Explanations
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SET 25 – Computer Science MCQs
✅ No repetition from Sets 1–24
✅ 10 brand-new questions
✅ Each explanation i
Level: Class 9–10 / Beginners
1. What is e-waste?
A. Online files
B. Energy waste
C. Discarded electronic devices
D. Software errors
✅ Correct Answer: C
Explanation:
E-waste refers to electronic waste such as old computers, mobile phones, printers, and batteries that are no longer in use. These devices contain harmful materials that can damage the environment if not disposed of properly. Recycling e-waste helps conserve resources and reduce pollution.
2. What is green computing?
A. Fast computing
B. Gaming technology
C. Environment-friendly use of computers
D. Online learning
✅ Correct Answer: C
Explanation:
Green computing is the practice of using computers and technology in an environmentally responsible way. It includes reducing energy consumption, recycling hardware, and using eco-friendly devices. Green computing helps reduce carbon emissions and supports sustainable development in the digital world.
3. What is an energy-efficient device?
A. Uses more electricity
B. Uses less power to perform tasks
C. Works slowly
D. Needs frequent charging
✅ Correct Answer: B
Explanation:
An energy-efficient device performs the same tasks while consuming less electrical power. Examples include LED monitors and energy-star-rated laptops. Using energy-efficient devices reduces electricity bills and environmental impact, making technology more sustainable and cost-effective.
4. What is digital citizenship?
A. Computer ownership
B. Online shopping
C. Responsible behavior while using technology
D. Internet speed
✅ Correct Answer: C
Explanation:
Digital citizenship refers to responsible, safe, and ethical behavior when using digital technology and the internet. It includes respecting others online, protecting personal data, and following digital laws. Good digital citizens contribute positively to online communities.
5. What is cyber ethics?
A. Hacking skills
B. Internet speed
C. Moral rules for using computers and the internet
D. Software installation
✅ Correct Answer: C
Explanation:
Cyber ethics involves the moral principles that guide responsible use of computers and the internet. It includes respecting privacy, avoiding cybercrime, and using technology honestly. Cyber ethics help maintain trust, safety, and fairness in the digital environment.
6. What is online privacy?
A. Public data sharing
B. Hiding computer
C. Protection of personal information on the internet
D. Internet speed
✅ Correct Answer: C
Explanation:
Online privacy refers to protecting personal information such as passwords, photos, and personal details from unauthorized access on the internet. Strong passwords, privacy settings, and cautious sharing help maintain online privacy and prevent identity theft or misuse.
7. What is a secure password?
A. Short password
B. Common word
C. Combination of letters, numbers, and symbols
D. User name
✅ Correct Answer: C
Explanation:
A secure password uses a mix of uppercase and lowercase letters, numbers, and symbols. Strong passwords are difficult to guess and protect accounts from hacking. Avoid using personal information. Regularly updating passwords further improves online security.
8. What is two-step verification?
A. Login twice
B. Backup system
C. Extra security step during login
D. Data storage
✅ Correct Answer: C
Explanation:
Two-step verification adds an extra layer of security by requiring a second form of authentication, such as a code sent to a phone. Even if a password is stolen, this method helps prevent unauthorized access and improves account protection.
9. What is digital well-being?
A. Internet speed
B. Computer maintenance
C. Balanced and healthy use of technology
D. Software update
✅ Correct Answer: C
Explanation:
Digital well-being focuses on using technology in a healthy and balanced way. It includes managing screen time, avoiding addiction, and maintaining physical and mental health. Practicing digital well-being helps users enjoy technology without negative effects.
10. What is cyberbullying?
A. Online gaming
B. Software error
C. Harassment using digital platforms
D. Virus attack
✅ Correct Answer: C
Explanation:
Cyberbullying is the act of harassing, threatening, or embarrassing someone using digital platforms like social media or messaging apps. It can cause emotional harm and stress. Reporting abuse, blocking offenders, and promoting respectful online behavior help prevent cyberbullying.
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