Computer Science
Multiple Choice
Questions
(MCQs) – Sets 21
with Detailed Explanations
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SET 21 – Computer Science MCQs
✅ No repetition from Sets 1–20
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a public cloud?
A. Cloud owned by one user
B. Offline storage
C. Cloud services available to the public
D. Private network
✅ Correct Answer: C
Explanation:
A public cloud is a cloud computing model where services like storage and applications are provided to the general public over the internet. These services are managed by third-party providers such as Google or Amazon. Public clouds are cost-effective, scalable, and easy to access.
2. What is a hybrid cloud?
A. Only private cloud
B. Only public cloud
C. Combination of public and private clouds
D. Local server
✅ Correct Answer: C
Explanation:
A hybrid cloud combines both private and public cloud environments. It allows data and applications to move between them, offering flexibility and better control. Organizations use hybrid clouds to keep sensitive data private while using public clouds for general tasks.
3. What is community cloud?
A. Free cloud service
B. Cloud for gaming
C. Cloud shared by organizations with common needs
D. Personal cloud
✅ Correct Answer: C
Explanation:
A community cloud is shared by multiple organizations with similar requirements, such as security or compliance. It reduces costs while maintaining specific controls. Examples include government or educational institutions sharing cloud infrastructure for common goals.
4. What is cloud security?
A. Internet speed
B. Hardware repair
C. Protection of cloud data and services
D. Software installation
✅ Correct Answer: C
Explanation:
Cloud security involves protecting data, applications, and services hosted in the cloud. It includes encryption, access control, and monitoring. Strong cloud security ensures data privacy, prevents cyberattacks, and builds trust in cloud-based systems.
5. What is multi-cloud strategy?
A. Single cloud usage
B. No cloud
C. Using multiple cloud providers
D. Local storage
✅ Correct Answer: C
Explanation:
A multi-cloud strategy uses services from multiple cloud providers to avoid dependency on one vendor. It improves reliability, flexibility, and performance. Organizations adopt multi-cloud approaches to reduce risks and optimize costs across different platforms.
6. What is edge computing?
A. Centralized computing
B. Cloud gaming
C. Processing data near its source
D. Offline computing
✅ Correct Answer: C
Explanation:
Edge computing processes data closer to where it is generated, such as IoT devices. It reduces latency and bandwidth usage. Edge computing is important for real-time applications like smart devices, autonomous vehicles, and industrial automation.
7. What is Internet of Things (IoT)?
A. Website design
B. Computer repair
C. Network of connected smart devices
D. Programming language
✅ Correct Answer: C
Explanation:
IoT refers to a network of physical devices embedded with sensors and software that communicate over the internet. Examples include smart home devices and wearable technology. IoT improves automation, data collection, and efficiency in everyday life.
8. What is a smart device?
A. Normal electronic device
B. Mechanical tool
C. Device with internet connectivity and intelligence
D. Hardware only
✅ Correct Answer: C
Explanation:
A smart device connects to the internet and can collect, process, and exchange data. Examples include smart phones, smart TVs, and smart thermostats. These devices enhance convenience by offering automation and remote control features.
9. What is big data?
A. Small files
B. Single database
C. Large and complex data sets
D. Text editor
✅ Correct Answer: C
Explanation:
Big data refers to extremely large and complex data sets that traditional systems cannot handle efficiently. It includes data from social media, sensors, and transactions. Big data analytics helps organizations discover patterns and make informed decisions.
10. What is artificial intelligence (AI)?
A. Manual work
B. Hardware device
C. Machines simulating human intelligence
D. Internet service
✅ Correct Answer: C
Explanation:
Artificial Intelligence is the ability of machines to perform tasks that normally require human intelligence, such as learning and problem-solving. AI is used in voice assistants, recommendation systems, and robotics, transforming many industries.
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