Computer Science
Multiple Choice
Questions
(MCQs) – Sets 30
with Detailed Explanations
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SET 30 – Computer Science MCQs
✅ No repetition from Sets 1–29
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is cloud computing?
A. Weather forecasting
B. Local data storage
C. Using internet-based computing services
D. Hardware repair
✅ Correct Answer: C
Explanation:
Cloud computing refers to using computing services such as storage, servers, databases, and software over the internet instead of local computers. Examples include Google Drive and Microsoft OneDrive. It allows users to access data anytime, anywhere, reduces hardware costs, and supports collaboration.
2. What is cloud storage?
A. Hard disk
B. Pen drive
C. Online data storage service
D. RAM
✅ Correct Answer: C
Explanation:
Cloud storage is an online service that allows users to store files on remote servers accessed through the internet. It provides data backup, easy sharing, and access from multiple devices. Popular examples include Dropbox, Google Drive, and iCloud.
3. What is SaaS (Software as a Service)?
A. Hardware rental
B. Internet cable
C. Software delivered through the internet
D. Operating system
✅ Correct Answer: C
Explanation:
SaaS is a cloud computing model where software applications are provided over the internet. Users do not need to install or maintain the software. Examples include Gmail and Google Docs. SaaS reduces maintenance effort and allows easy updates.
4. What is PaaS (Platform as a Service)?
A. Data storage
B. Internet service
C. Platform for application development
D. Antivirus
✅ Correct Answer: C
Explanation:
PaaS provides a platform allowing developers to build, test, and deploy applications without managing underlying infrastructure. It includes tools, databases, and operating systems. Examples include Google App Engine and Microsoft Azure.
5. What is IaaS (Infrastructure as a Service)?
A. Software service
B. Email service
C. Virtual computing infrastructure
D. Search engine
✅ Correct Answer: C
Explanation:
IaaS provides virtualized computing resources such as servers, storage, and networks over the internet. Users can manage operating systems and applications. Examples include Amazon EC2 and Google Compute Engine. It offers flexibility and scalability.
6. What is virtualization?
A. Hardware destruction
B. Physical storage
C. Creating virtual versions of computing resources
D. Data deletion
✅ Correct Answer: C
Explanation:
Virtualization is the process of creating virtual versions of hardware resources like servers or storage. It allows multiple virtual machines to run on one physical machine. Virtualization improves efficiency, reduces costs, and is a key technology behind cloud computing.
7. What is a virtual machine (VM)?
A. Physical computer
B. Software virus
C. Software-based computer system
D. Network cable
✅ Correct Answer: C
Explanation:
A virtual machine is a software-based simulation of a physical computer. It runs an operating system and applications just like a real computer. VMs are widely used in testing, cloud services, and server management to improve resource utilization.
8. What is data backup in cloud computing?
A. Data deletion
B. File sharing
C. Copying data to cloud for safety
D. Data compression
✅ Correct Answer: C
Explanation:
Cloud data backup involves copying data to remote cloud servers to protect it from loss due to hardware failure, accidents, or cyberattacks. It ensures data recovery and business continuity. Automatic backups make cloud services reliable and secure.
9. What is scalability in cloud computing?
A. Data encryption
B. Network security
C. Ability to increase or decrease resources
D. Data transfer
✅ Correct Answer: C
Explanation:
Scalability refers to the ability of cloud systems to adjust resources based on demand. Users can increase storage or computing power during high usage and reduce it when demand decreases. This flexibility makes cloud computing cost-effective.
10. What is a private cloud?
A. Public internet
B. Free service
C. Cloud used by a single organization
D. Social media
✅ Correct Answer: C
Explanation:
A private cloud is a cloud computing environment used exclusively by one organization. It offers greater control, security, and customization compared to public clouds. Private clouds are commonly used by businesses handling sensitive data.
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