Boost Your UPSC EPFO APFC Prep: 15 Must-Know Science & Technology MCQs Explained
Are you gearing up for the UPSC EPFO APFC exam? If yes, then you already know that Science and Technology form a vital part of your syllabus. But mastering this section isn’t just about reading textbooks — it’s about practicing exam-oriented questions that sharpen your understanding and boost your confidence. That’s precisely why this blog post is a game-changer: it distills 15 crucial multiple-choice questions (MCQs) from Sleepy Classes IAS’s latest video, complete with detailed explanations to help you ace your preparation.
Whether you’re struggling with physics, chemistry, biology, space technology, or environmental science, this post will guide you through key concepts in a simple, engaging manner. Plus, it’s a perfect way to revise important topics and improve your accuracy before the exam day.
So, let’s dive into these carefully curated MCQs and unlock the secrets to mastering Science & Technology for UPSC EPFO APFC!
Why Is This Practice Session Important?
Science and Technology is often seen as a challenging section because it covers a broad spectrum of topics — from Newton’s laws to space technology, from environmental science to biotechnology. But practicing MCQs aligned with the exam pattern helps you:
- Reinforce your conceptual clarity
- Identify frequently asked questions
- Become familiar with statement-based questions
- Improve your question-solving speed and accuracy
- Revise important NCERT topics effectively
This session by Sleepy Classes IAS is tailored to make your revision easier and more effective. Let’s explore each question and its key takeaways.
Key Concepts Covered in These 15 MCQs
1. Newton’s Laws of Motion and Rocket Propulsion
The first two questions focus on Newton’s First and Third Laws. For example, understanding inertia — the property that resists change in motion — is fundamental. The explanation clarifies how inertia is related to Newton’s First Law and how rocket propulsion operates based on action-reaction principles (Third Law). Recognizing these core principles is essential for solving related questions confidently.
2. Total Internal Reflection & Optical Fibre Technology
Next, you learn about how light travels through different media, especially the phenomenon of total internal reflection. This concept is the backbone of optical fibre technology, which powers global internet connectivity. Remember, when light hits the boundary at an angle greater than the critical angle, it reflects entirely inside — a principle that makes fibre optics possible.
3. Elements, Compounds, and Mixtures
Understanding the distinction between elements, compounds, and mixtures is essential in chemistry. The MCQs reinforce that compounds are chemically combined in fixed proportions (like H₂O), whereas mixtures retain their individual properties and can be separated physically.
4. Plaster of Paris & Gypsum
These questions clarify that Plaster of Paris is produced by heating gypsum (calcium sulfate dihydrate) to remove water. This knowledge is useful in understanding its uses in medical casts and construction.
5. Cell Structure: Mitochondria & Cell Wall
Biology questions here highlight that mitochondria are known as the “powerhouses of the cell” because they generate energy (ATP). Also, plant cells have a rigid cell wall, whereas animal cells do not, which is a common exam point.
6. Human Kidney & Nephrons
Understanding the function of nephrons—the functional units of the kidney—is critical. They filter blood, remove waste, and form urine. This is a core part of human biology questions in exams.
7. Earth’s Satellites & Orbits
Questions about geostationary satellites explain that these satellites orbit at approximately 35,786 km above the equator, matching the Earth’s rotation. This makes them appear stationary to ground observers, which is why they’re used for communication and weather monitoring.
8. Space Technology: ISRO’s AstroSat
The Indian Space Research Organisation (ISRO)’s AstroSat is India’s first dedicated multi-wavelength space observatory launched to study celestial sources across different spectra — X-ray, optical, and ultraviolet. Knowing such missions is important for space technology questions.
9. CRISPR-Cas9 & Genome Editing
This revolutionary biotechnology tool enables precise editing of DNA sequences. It’s used for targeted gene modification, which has implications in medicine, agriculture, and research. Remember, it operates as a molecular scissors, cutting DNA at specific sites.
10. Nanotechnology & Carbon Nanotubes
Nanotechnology involves manipulating materials at the nanoscale (1-100 nm). Carbon nanotubes are notable for their extraordinary strength and electrical conductivity, making them valuable in industries like electronics, medicine, and materials science.
11. Eutrophication & Algal Blooms
Environmental science questions focus on how excess nutrients like nitrates and phosphates lead to algal blooms, which deplete oxygen in water bodies, causing ecological harm — a process called eutrophication.
12. Ozone Layer & Stratosphere
The ozone layer, located in the stratosphere, protects life on Earth from harmful UV radiation. Understanding its location and importance is crucial for environmental science.
13. Hemoglobin & Oxygen Transport
The role of hemoglobin in blood as a molecule that binds and transports oxygen is a fundamental biology topic. It’s vital for understanding human physiology.
14. Sublimation & Changes of State
Sublimation refers to the direct transition of a solid to a gas without passing through the liquid phase — an important concept in physical chemistry, with everyday examples like dry ice.
15. Greenhouse Gases & Climate Change
Finally, questions about greenhouse gases clarify that water vapor is the most abundant greenhouse gas in the atmosphere, but carbon dioxide is the major contributor to climate change. This distinction is critical for understanding global warming.
Why Should You Watch the Full Video?
This detailed video by Sleepy Classes IAS is a treasure trove for UPSC aspirants. It not only explains these 15 questions but also dives deeper into the underlying concepts, making complex topics easy to grasp. Whether you’re revising NCERTs or preparing for tricky statement-based questions, this session will help you:
- Strengthen your conceptual foundation
- Practice exam-oriented MCQs
- Clarify doubts with detailed explanations
- Enhance your overall accuracy and confidence
Pro tip: Regular practice with such MCQs, along with solving previous years’ papers, can significantly improve your chances of cracking the exam.
Ready to Boost Your Preparation?
If you found this overview helpful, don’t miss out on the complete video. Watching it will give you a comprehensive understanding of these crucial topics, further reinforced by detailed explanations and visual aids.
Click here to watch the full video now: 15 Important MCQs with Answers & Explanation | UPSC EPFO APFC Science & Technology
Remember, consistent practice is the key to success in UPSC exams. So, keep practicing these questions, analyze your mistakes, and stay focused on your goal. All the best for your preparation!
Stay connected: For more practice questions, study materials, and expert guidance, explore Sleepy Classes IAS’s offerings and join their Telegram group for daily updates.
Happy studying, and see you at the top!
