Download Class 10 Science Sample Paper 2020-21 with Full Solutions & Answers

sample paper class 10 science 2020-21 with solutions provided here includes detailed answers, marking scheme, and CBSE pattern questions for effective revision.

Sure! Here's a user-friendly heading followed by 50 sample questions and answers for Class 10 Science (2020–21), covering all key chapters based on the CBSE pattern. Since it's focused on one subject (Science), all 50 questions and answers will be from that subject. The answers are written in clear, easy-to-understand language—no formulas, just plain concepts.

Question: What is the role of decomposers in the ecosystem?
Answer: Decomposers break down dead plants and animals into simpler substances, recycling nutrients back into the soil and maintaining the balance in nature.

Question: Why is the ozone layer important for us?
Answer: The ozone layer protects us from harmful ultraviolet rays from the sun, which can cause skin cancer and other health issues.

Question: How does baking soda help in extinguishing a fire?
Answer: Baking soda releases carbon dioxide gas when heated, which cuts off the oxygen supply to the fire and helps extinguish it.

Question: What is the function of the human heart?
Answer: The heart pumps blood throughout the body, supplying oxygen and nutrients while removing carbon dioxide and waste products.

Question: Why is it advised to use a convex mirror in vehicles as rear-view mirrors?
Answer: Convex mirrors provide a wider field of view, allowing drivers to see more area behind them for better safety.

Question: What is the difference between biodegradable and non-biodegradable substances?
Answer: Biodegradable substances break down naturally by microorganisms, while non-biodegradable substances do not decompose easily and cause pollution.

Question: How is acid rain formed?
Answer: Acid rain forms when sulfur dioxide and nitrogen oxides from factories and vehicles mix with rainwater, making it acidic.

Question: Why do we see lightning before hearing thunder?
Answer: Light travels faster than sound, so we see the flash of lightning before we hear the thunder.

Question: How do plants prepare their food?
Answer: Plants use sunlight, carbon dioxide, and water to make their food through a process called photosynthesis.

Question: What is the role of hemoglobin in our body?
Answer: Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to the rest of the body.

Question: What happens when you mix vinegar and baking soda?
Answer: They react to form carbon dioxide gas, causing bubbling and fizzing.

Question: Why are LED bulbs more efficient than traditional bulbs?
Answer: LED bulbs use less electricity and produce more light without generating much heat.

Question: How is energy transferred in a food chain?
Answer: Energy is passed from producers (plants) to herbivores and then to carnivores, with some energy lost at each level.

Question: What causes the greenhouse effect?
Answer: Greenhouse gases like carbon dioxide trap heat in the Earth's atmosphere, causing a rise in global temperature.

Question: Why does salt help in preserving food?
Answer: Salt removes moisture from food and creates an environment that prevents bacteria from growing.

Question: How do vaccines work in our body?
Answer: Vaccines prepare the immune system to recognize and fight specific germs by introducing a weakened or inactive form of them.

Question: What is the importance of water in our body?
Answer: Water helps in digestion, absorption of nutrients, circulation, and removal of waste from the body.

Question: Why does iron rust?
Answer: Iron reacts with oxygen and moisture in the air, forming a reddish-brown layer called rust.

Question: What is meant by refraction of light?
Answer: Refraction is the bending of light when it passes from one medium to another, like from air to water.

Question: What is the function of the respiratory system?
Answer: It helps us breathe by taking in oxygen and releasing carbon dioxide from the body.

Question: How are fossils formed?
Answer: Fossils are formed when plants or animals get buried under sediments and their remains turn into rock over a long time.

Question: What is the role of stomata in plants?
Answer: Stomata are tiny openings on leaves that allow the exchange of gases and release of water vapor.

Question: Why does the sky appear blue?
Answer: The sky looks blue because blue light from the sun is scattered in all directions by the atmosphere more than other colors.

Question: What happens when magnesium ribbon is burned?
Answer: It burns with a bright white light and forms a white powder called magnesium oxide.

Question: How do electric circuits work?
Answer: Electric circuits work by allowing electric current to flow through wires and components like bulbs or motors.

Question: What are inherited traits?
Answer: Inherited traits are characteristics passed from parents to their children through genes.

Question: What is the function of the large intestine in our body?
Answer: The large intestine absorbs water from undigested food and helps in forming solid waste.

Question: How do we hear sound?
Answer: Sound waves enter our ears, vibrate the eardrum, and send signals to the brain that we recognize as sound.

Question: Why do we need to conserve electricity?
Answer: Saving electricity reduces pollution, lowers energy bills, and helps conserve resources for the future.

Question: What causes day and night?
Answer: Day and night are caused by the rotation of the Earth on its axis.

Question: What is a natural resource?
Answer: A natural resource is something we get from nature, like air, water, minerals, and forests, that we use in our daily life.

Question: What is the function of the digestive system?
Answer: The digestive system breaks down food into simpler substances that the body can absorb and use.

Question: How do magnets work?
Answer: Magnets attract materials like iron due to the presence of magnetic fields.

Question: Why is carbon important for life?
Answer: Carbon forms the basic structure of all living things and is found in proteins, fats, carbohydrates, and DNA.

Question: What is a chemical reaction?
Answer: A chemical reaction is a change in which new substances with different properties are formed.

Question: What is an ecosystem?
Answer: An ecosystem is a community of living things and their environment, interacting with each other.

Question: Why do we wear cotton clothes in summer?
Answer: Cotton absorbs sweat and allows air to pass through, keeping us cool in hot weather.

Question: How are rainbows formed?
Answer: Rainbows are formed when sunlight passes through raindrops, which bend and reflect the light to create different colors.

Question: What is the function of chlorophyll in plants?
Answer: Chlorophyll is the green pigment in plants that helps absorb sunlight for photosynthesis.

Question: How can we reduce air pollution?
Answer: We can reduce air pollution by using public transport, planting trees, and avoiding burning waste.

Question: What is the importance of blood in our body?
Answer: Blood carries oxygen and nutrients to all parts of the body and removes waste products.

Question: Why does a compass needle always point north?
Answer: A compass needle aligns with the Earth’s magnetic field, which points toward the magnetic north.

Question: What are synthetic fibers?
Answer: Synthetic fibers are man-made fibers made from chemicals, like nylon or polyester.

Question: What causes tides in the sea?
Answer: Tides are caused by the gravitational pull of the moon and the sun on the Earth’s oceans.

Question: What is pollution?
Answer: Pollution is the presence of harmful substances in the environment that affect health and nature.

Question: Why is deforestation harmful?
Answer: Deforestation destroys animal habitats, causes soil erosion, and contributes to climate change.

Question: How does the nervous system work?
Answer: The nervous system controls body activities by sending and receiving signals between the brain and other parts.

Question: What is composting?
Answer: Composting is the process of turning organic waste like food scraps into nutrient-rich soil.

Question: What is the importance of recycling?
Answer: Recycling reduces waste, saves natural resources, and helps protect the environment.

Question: Why do we need vitamins in our diet?
Answer: Vitamins help our body function properly, support growth, and prevent diseases.

Let me know if you want this in a downloadable format or want sample questions for other subjects like Maths or Social Science too!

Top Indian Books for Class 10 Science Sample Papers 2020–21 with Solutions

Oswaal CBSE Sample Question Papers – Science Class 10
Author: Oswaal Editorial Board
Publisher: Oswaal Books and Learning Pvt Ltd
Content: Includes CBSE sample papers with step-by-step solutions, mind maps, revision notes, and practice questions. Focuses on frequently asked questions, case-based, and assertion-reason questions.

Educart CBSE Science Sample Papers Class 10 (2020–21)
Author: Educart Team
Publisher: Educart
Content: Features solved and unsolved papers, sample-based MCQs, and detailed explanations. Updated with revised syllabus and question patterns from CBSE.

Xam Idea Class 10 Science Sample Paper 2020–21
Author: VK Global Publications Editorial Team
Publisher: VK Global Publications
Content: Covers latest typologies including objective, very short, and long answer type questions with in-depth answers.

Arihant All in One Science CBSE Class 10 Sample Papers
Author: Arihant Experts
Publisher: Arihant Publications
Content: Includes chapter-wise theory and multiple sample papers with solutions. Great for concept clarity and step-based problem solving.

Together with Science CBSE Class 10 Sample Papers
Author: Rachna Sagar
Publisher: Rachna Sagar Pvt Ltd
Content: Provides model test papers, HOTS, and assertion-reason questions with CBSE marking scheme.

MTG 15+ Sample Papers Science Class 10 (2020–21)
Author: MTG Editorial Board
Publisher: MTG Learning Media
Content: Offers 15+ papers with solutions based on the CBSE blueprint, competency-based and case-based questions included.

Super 10 CBSE Sample Papers Science Class 10
Author: Disha Experts
Publisher: Disha Publications
Content: Includes 10 practice papers with solutions, sample blueprints, and detailed performance analysis.

Full Marks CBSE Science Sample Papers Class 10
Author: Team Full Marks
Publisher: Full Marks Pvt Ltd
Content: Offers important questions, topic-by-topic coverage, and model test papers with detailed answers.

CBSE Sample Question Papers – Science Class 10 by Golden
Author: Golden Publication Team
Publisher: New Age International Publishers
Content: Consists of board-style sample questions with complete marking scheme and solution keys.

Target CBSE 10th Science Sample Papers 2020–21
Author: Target Experts
Publisher: Target Publications
Content: Practice-oriented, with previous year trends and solutions for MCQs, short and long answers.

Evergreen 20+ Sample Papers Science Class 10
Author: Evergreen Editorial Team
Publisher: Evergreen Publications
Content: Detailed solutions with tips and tricks, covers all units and integrated questions for board exam prep.

NCERT Based Sample Papers Science Class 10 by MBD
Author: MBD Editorial Team
Publisher: MBD Group
Content: Covers NCERT pattern with concept-based questions and solution analysis.

Examguru CBSE Science Sample Papers Class 10
Author: Examguru Experts
Publisher: Arya Publications
Content: Designed for thorough exam prep, includes value-based and mixed concept questions with solutions.

CBSE Chapterwise Sample Questions – Science Class 10 by Arihant
Author: Arihant Experts
Publisher: Arihant Publications
Content: Topic-wise breakdown with sample questions for each section, well-explained answers and hints.

Topper’s Sample Papers Science Class 10 by Vidya
Author: Vidya Editorial Board
Publisher: Vidya Prakashan Mandir
Content: Practice sets for last-minute prep, with model answers for quick understanding.

Board Booster Science Sample Papers Class 10 by Goyal Brothers
Author: Goyal Brothers Editorial Team
Publisher: Goyal Brothers Prakashan
Content: Revision-friendly, exam-oriented papers with key concept summaries and marking breakdown.

Candid Sample Papers Science Class 10
Author: Candid Publications Team
Publisher: Evergreen Publications
Content: Includes assertion-reasoning questions, case studies, MCQs, and exam pattern solutions.

Score More Sample Papers Science Class 10
Author: Learnwell Experts
Publisher: Learnwell Publications
Content: Board-specific samples, chapter-linked practice papers, and review notes.

Smart Exam Sample Papers – Science Class 10 by New Saraswati House
Author: New Saraswati House Team
Publisher: New Saraswati House
Content: Real exam simulations, marking scheme tips, and expert-reviewed answers.

Exam Idea Sample Papers Science Class 10
Author: Editorial Team
Publisher: Kundan Publications
Content: A blend of concept-based and board-style questions, MCQs, and scoring guidelines.

Sample Paper Class 10 Science 2020-21 with Solutions – Expert Tips and Study Guide

Preparing for the CBSE Class 10 Science exam can feel overwhelming, especially with changing formats and updated guidelines. The 2020–21 academic year introduced a new wave of question types, including case-based questions, MCQs, assertion-reasoning, and competency-based questions. That’s why solving sample papers with accurate solutions is one of the smartest strategies to score high.

Sample papers simulate the actual exam environment and help students assess their readiness. By working through them, students not only learn the exam format but also gain confidence in managing time during the real test. These papers often include all-important sections like Physics, Chemistry, and Biology—aligned with the latest syllabus issued by CBSE.

One of the key advantages of using solved sample papers is the step-by-step guidance they offer. Whether it's a descriptive biology question or a numerically worded chemistry query, well-structured solutions show how to approach and answer efficiently. For many students, these books also help in identifying commonly repeated questions and important concepts.

Top educators recommend beginning with NCERT basics and then moving on to sample papers that include full marking schemes and explanations. These solutions highlight where to gain or lose marks and how to present answers as per the board’s expectations. Books like Oswaal, Educart, and Arihant are popular among both students and teachers due to their structured format and clarity.

Another big plus is that many sample papers include self-assessment sheets, chapter-wise practice sets, and time-bound test formats. These make preparation more organized and focused. Especially with science, understanding how to express processes, diagrams, and logical steps matters as much as knowing the answer.

Incorporating sample paper practice early in the academic year leads to greater retention and less pressure closer to the exam. It’s also a great way to practice competency-based questions, which test application, analysis, and inference rather than rote memorization.

For a well-rounded approach, students should aim to solve at least 10–15 full-length sample papers before the final exam. Each paper they attempt becomes a revision session and exposes gaps in learning. The key is to evaluate the solutions afterward—understanding not just what went wrong, but why.

If you're targeting a top score in Science, integrating sample papers with solutions into your revision schedule can be a game-changer. It ensures concept clarity, boosts speed, and polishes exam presentation skills. These books are not just practice tools—they're confidence boosters in disguise.