Software Scalability Basics Quiz

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| Questions: 15 | Updated: Apr 30, 2026
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1. What does scalability mean in software systems?

Explanation

Scalability in software systems refers to the capability of a system to efficiently manage increasing workloads or user demands without compromising performance. This means that as more users or data are added, the system can expand and adapt, ensuring consistent and effective operation.

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About This Quiz
Software Scalability Basics Quiz - Quiz

This Software Scalability Basics Quiz evaluates your understanding of how systems grow and handle increased demand. Learn key concepts like vertical and horizontal scaling, load balancing, and database optimization. Perfect for grade 10 students building foundational knowledge in system design and performance.

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2. Which scaling method adds more powerful hardware to a single server?

Explanation

Vertical scaling involves adding more powerful hardware to a single server, such as upgrading the CPU, RAM, or storage. This approach enhances the server's capacity to handle increased loads without changing the architecture, making it a straightforward solution for improving performance in a centralized system.

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3. Horizontal scaling involves adding more ____ to distribute the load.

Explanation

Horizontal scaling refers to increasing a system's capacity by adding more machines or servers rather than upgrading existing ones. This approach allows for better load distribution, improved performance, and enhanced reliability, as multiple servers can handle requests simultaneously, reducing the risk of overload on any single server.

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4. What is a load balancer?

Explanation

A load balancer is a device that helps manage network traffic by distributing incoming requests evenly across multiple servers. This ensures no single server becomes overwhelmed, enhancing performance, reliability, and availability of applications, ultimately leading to a smoother user experience.

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5. True or False: Vertical scaling is unlimited and always cheaper than horizontal scaling.

Explanation

Vertical scaling has limits, as it involves upgrading a single server's resources, which can become costly and impractical. In contrast, horizontal scaling adds more servers to distribute the load, often providing a more cost-effective and flexible solution for handling increased demand. Thus, the statement is false.

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6. Database ____ is a technique to split data across multiple servers.

Explanation

Sharding is a database architecture pattern that involves partitioning data into smaller, more manageable pieces called shards. Each shard is stored on a different server, allowing for improved performance, scalability, and availability. This technique helps distribute the load and enhances the database's ability to handle large volumes of data efficiently.

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7. Which approach stores copies of data on multiple servers for faster access?

Explanation

Replication involves creating and maintaining multiple copies of data across different servers. This approach enhances data availability and access speed, as users can retrieve information from the nearest server, reducing latency and improving performance. It is particularly beneficial for load balancing and ensuring data redundancy in case of server failures.

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8. What is caching used for in scalable systems?

Explanation

Caching is utilized in scalable systems to enhance performance by temporarily storing frequently accessed data. This reduces the need to repeatedly fetch data from slower storage sources, thereby speeding up data retrieval and improving overall system efficiency, especially under high load conditions.

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9. A ____ database stores data in rows and columns, while a NoSQL database stores unstructured data.

Explanation

A relational database organizes data into structured tables consisting of rows and columns, making it easy to manage and query using SQL. In contrast, NoSQL databases are designed to handle unstructured or semi-structured data, allowing for greater flexibility and scalability in data storage and retrieval.

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10. True or False: NoSQL databases like MongoDB are always better for scalability than relational databases.

Explanation

While NoSQL databases like MongoDB offer advantages in scalability for certain workloads, relational databases can also scale effectively, particularly with vertical scaling or sharding techniques. The choice between them depends on specific use cases, data structures, and application requirements, making it incorrect to claim that NoSQL databases are always superior for scalability.

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11. What does API rate limiting help prevent?

Explanation

API rate limiting helps prevent server overload by restricting the number of requests a user can make in a given timeframe. This ensures the server can handle requests efficiently, maintaining performance and reliability while protecting it from potential abuse or excessive load that could lead to downtime or degraded service.

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12. Content Delivery Networks (CDNs) improve scalability by ____ content closer to users.

Explanation

CDNs enhance scalability by storing copies of content at multiple geographically distributed servers. This proximity to users reduces latency, improves load times, and efficiently manages traffic, allowing for a seamless experience even during peak demand. By caching content closer to the end-users, CDNs ensure faster delivery and better performance.

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13. Which of these is NOT a scalability challenge?

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14. Microservices architecture improves scalability by breaking applications into ____ independent services.

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15. True or False: Monitoring and logging are unnecessary for scalable systems.

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What does scalability mean in software systems?
Which scaling method adds more powerful hardware to a single server?
Horizontal scaling involves adding more ____ to distribute the load.
What is a load balancer?
True or False: Vertical scaling is unlimited and always cheaper than...
Database ____ is a technique to split data across multiple servers.
Which approach stores copies of data on multiple servers for faster...
What is caching used for in scalable systems?
A ____ database stores data in rows and columns, while a NoSQL...
True or False: NoSQL databases like MongoDB are always better for...
What does API rate limiting help prevent?
Content Delivery Networks (CDNs) improve scalability by ____ content...
Which of these is NOT a scalability challenge?
Microservices architecture improves scalability by breaking...
True or False: Monitoring and logging are unnecessary for scalable...
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