Crack CTET Paper 2 Science: 50 Essential SAQs and Previous Year Solutions
Preparing for the CTET Paper 2 Science section can be challenging, especially when you need to cover the vast NCERT Class 6–8 syllabus while mastering complex Science Pedagogy. To help you score 30/30, we have compiled the ultimate revision guide featuring 50 Short Answer Questions (SAQs) based on CTET previous year questions.
Whether you are struggling with Physics numerical, Chemistry reactions, or understanding the 5E Learning Model, these detailed 5-10 line explanations are designed to build your conceptual clarity. This guide follows the latest CTET 2026 exam pattern, ensuring you focus on “high-yield” topics like Force, Pressure, Microorganisms, and Constructivism. Dive in to strengthen your preparation and boost your confidence for the upcoming Teacher Eligibility Test!
Physics & Chemistry Focus
1. Why is a lightning conductor installed on tall buildings?
A lightning conductor is a metal rod (usually copper) that provides a low-resistance path for electric discharge. During a storm, it intercepts the lightning strike and conducts the electrical energy safely into the ground (earthing), preventing the building from catching fire or suffering structural damage.
2. Explain why a wooden spoon remains cold when dipped in a cup of ice cream.
This is a classic question on heat transfer. Wood is a poor conductor of heat (an insulator). Unlike metals, which transfer heat via free electrons, the molecules in wood do not easily pass kinetic energy to their neighbors. Therefore, heat from the spoon’s handle doesn’t flow to the cold end, and the handle stays at room temperature.
3. What is the “Neutralization Reaction” in everyday life?
Neutralization occurs when an acid and a base react to form salt and water. A common example is treating acidity (indigestion) with antacids like Milk of Magnesia (Magnesium Hydroxide), which is basic. The base neutralizes the excess Hydrochloric acid in the stomach, providing relief.
4. Why do we see lightning before we hear thunder?
This is due to the vast difference in the speeds of light and sound. Light travels at approximately $3 \times 10^8$ m/s, whereas sound travels at only about $340$ m/s in air. Because light is significantly faster, the visual signal reaches our eyes almost instantaneously, while the sound waves take several seconds to cover the same distance.
5. How does a concave mirror differ from a convex mirror in image formation?
A concave mirror can form both real and virtual images, and they can be magnified or diminished depending on the object’s position. A convex mirror, however, always forms a virtual, erect, and diminished image. This is why convex mirrors are used as rear-view mirrors in vehicles to provide a wider field of view.
6. Distinguish between physical and chemical changes.
A physical change affects the form of a substance but not its chemical composition (e.g., melting ice). It is usually reversible. A chemical change results in the formation of new substances with different properties (e.g., burning paper or rusting iron) and is typically irreversible.
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7. Why is synthetic fiber like Polyester preferred for making umbrellas?
Polyester is a synthetic polymer that is hydrophobic (water-resistant). It does not absorb water, dries quickly, and is very durable and wrinkle-resistant compared to natural fibers like cotton. Its ability to maintain its shape even when wet makes it ideal for rain gear.
8. What is the role of a catalyst in a chemical reaction?
A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It works by providing an alternative pathway with a lower activation energy. This allows the reaction to happen faster or at lower temperatures, which is crucial in industrial processes.
Biology & Environmental Science Focus
9. Explain the process of “Emulsification of Fats.”
Since fats are not soluble in water, they form large globules in the small intestine. Bile juice, secreted by the liver, breaks these large globules into tiny droplets. This process, called emulsification, increases the surface area for lipase enzymes to act upon, making fat digestion more efficient.
10. What is the significance of “Root Nodules” in leguminous plants?
Leguminous plants (like peas and beans) have a symbiotic relationship with Rhizobium bacteria residing in their root nodules. These bacteria convert atmospheric nitrogen—which plants cannot use directly—into soluble nitrates. In return, the plant provides the bacteria with food and shelter.
11. How does the “Pitch” of a sound depend on frequency?
Pitch is the brain’s perception of the frequency of a sound wave. A high-frequency vibration produces a high-pitched sound (like a whistle or a bird chirping), while a low-frequency vibration produces a low-pitched or “base” sound (like a drum or a man’s voice).
12. Describe the function of Guard Cells in plants.
Guard cells are kidney-shaped cells that surround the stomata (tiny pores) on leaf surfaces. They regulate the opening and closing of stomata by changing their turgidity. When they swell with water, the stoma opens for gas exchange and transpiration; when they lose water, the stoma closes to prevent water loss.
13. What is the difference between “Aerobic” and “Anaerobic” respiration?
Aerobic respiration occurs in the presence of oxygen and yields a high amount of energy (ATP), producing $CO_2$ and water. Anaerobic respiration occurs in the absence of oxygen (e.g., in yeast or human muscle cells during heavy exercise), yielding much less energy and producing lactic acid or ethanol.
14. Explain the “Greenhouse Effect.”
Certain gases in the atmosphere, like $CO_2$ and methane, trap infrared radiation (heat) reflected from the Earth’s surface. While this effect is necessary to keep the planet warm enough for life, an increase in these gases due to human activity leads to global warming.
15. Why is the “Cell Wall” present in plant cells but absent in animal cells?
Plant cells require a rigid cell wall made of cellulose because plants lack a skeleton for support. The wall provides structural strength, protects the cell against mechanical stress, and allows the plant to withstand high osmotic pressure without bursting.
16. What are the three components of “Biodiversity”?
Biodiversity generally refers to variety in the living world. It includes species diversity (the variety of species), genetic diversity (genetic variation within a species), and ecosystem diversity (the variety of habitats like forests, wetlands, and deserts).
Pedagogy & Scientific Inquiry
17. What is “Cognitive Validity” in a Science curriculum?
Cognitive validity requires that the curriculum, including language and content, be age-appropriate and within the intellectual reach of the learners. It ensures that students can process and understand the concepts being taught without being overwhelmed by complexity beyond their developmental stage.
18. Why is the “Discovery Method” important in Science teaching?
The discovery method shifts the focus from rote learning to active inquiry. Students interact with materials, perform experiments, and “discover” scientific principles themselves. This fosters critical thinking, curiosity, and a deeper conceptual understanding of how science works.
19. What is the role of “Formative Assessment” in a Science classroom?
Formative assessment is an ongoing process used by teachers to monitor student learning and provide feedback. Unlike summative exams, it identifies gaps in understanding during the unit, allowing the teacher to adjust their instruction and help students improve before a final grade is assigned.
20. Define “Process Skills” in Science.
Process skills are the tools scientists use to investigate the world. These include observing, classifying, measuring, predicting, inferring, and communicating. Teaching these skills is just as important as teaching facts, as they enable students to think and act like scientists.
Physics: Force, Pressure, and Light
21. Why are the soles of shoes treaded?
Treading increases the roughness of the surface of the shoe. This increases friction between the shoes and the ground, providing a better grip. Increased friction prevents slipping, especially on smooth or wet surfaces, ensuring safety while walking or running.
22. Explain why a sharp knife cuts better than a blunt one.
Pressure is defined as force per unit area ($P = F/A$). A sharp knife has a very small surface area at its cutting edge. For the same amount of force applied by the hand, the pressure exerted is much higher on a small area, allowing the knife to penetrate the object easily.
23. What is the “Lateral Inversion” seen in plane mirrors?
Lateral inversion is the phenomenon where the left side of an object appears as the right side in its mirror image, and vice versa. This happens because the mirror reflects light back in the same direction it came from. This is why the word “AMBULANCE” is written in reverse on vehicles—so drivers ahead can read it correctly in their rear-view mirrors.
24. Why does a plastic comb rubbed on hair attract tiny bits of paper?
This is due to electrostatic force. Rubbing the comb against dry hair causes a transfer of electrons, giving the comb an electric charge. When brought near neutral bits of paper, it induces an opposite charge on them, leading to an attractive force that lifts the paper.
25. What is “Dispersion of Light”?
Dispersion is the splitting of white light into its seven constituent colors (VIBGYOR) when it passes through a transparent medium like a glass prism. This happens because different colors of light travel at different speeds in the medium and bend at different angles. A rainbow is a natural example of dispersion.
26. How does an “Electroscope” work?
An electroscope is a device used to detect the presence and nature of an electric charge. It typically consists of two thin gold or aluminum leaves. When a charged object touches the metal knob, the charge travels to the leaves. Since like charges repel, the leaves diverge, indicating the object is charged.
Chemistry: Materials, Metals, and Fuels
27. Why is Phosphorus stored in water?
Phosphorus (specifically white phosphorus) is a very reactive non-metal. It catches fire spontaneously when exposed to air at room temperature. To prevent this accidental combustion and keep it away from atmospheric oxygen, it is stored submerged in water.
28. Explain the “Galvanization” process.
Galvanization is a method used to protect iron and steel from rusting. It involves coating the metal with a thin layer of Zinc. Even if the zinc coating is scratched, it acts as a sacrificial anode and corrodes instead of the iron, extending the life of the structure.
29. What is the “Calorific Value” of a fuel?
Calorific value is the amount of heat energy produced by the complete combustion of 1 kg of a fuel. It is measured in kJ/kg. A fuel with a higher calorific value is considered more efficient. For example, Hydrogen has a very high calorific value compared to coal or wood.
30. Why is Carbon Monoxide ($CO$) poisonous?
When inhaled, $CO$ combines with the hemoglobin in our blood to form carboxyhemoglobin. This compound is much more stable than oxyhemoglobin and prevents the blood from carrying oxygen to the body’s organs. This leads to oxygen starvation, which can be fatal.
31. Distinguish between Thermoplastics and Thermosetting plastics.
Thermoplastics (like Polythene or PVC) soften on heating and can be reshaped repeatedly. Thermosetting plastics (like Bakelite or Melamine), once molded, do not soften on heating and cannot be reshaped. This makes thermosetting plastics ideal for heat-resistant handles and electrical switches.
32. What is the “Reactivity Series” of metals?
The reactivity series is a list of metals arranged in decreasing order of their chemical reactivity. Metals at the top (like Potassium and Sodium) are highly reactive and displace metals lower in the series (like Copper or Iron) from their salt solutions in displacement reactions.
Biology: Cells, Microorganisms, and Systems
33. What is “Pasteurization”?
Developed by Louis Pasteur, this process involves heating milk to about 70°C for 15–30 seconds and then suddenly chilling it. This kills most harmful microorganisms without boiling the liquid or significantly altering its taste, increasing its shelf life.
34. Explain the function of “Villi” in the small intestine.
Villi are small, finger-like projections on the inner walls of the small intestine. They greatly increase the surface area for the absorption of digested food. Each villus has a network of thin blood vessels that transport the absorbed nutrients to the rest of the body.
35. How do vaccines work in the human body?
Vaccines introduce dead or weakened microbes into the body. The immune system recognizes these as “invaders” and produces antibodies to fight them. The body “remembers” how to fight that specific pathogen, providing immunity if the actual live microbe enters the body later.
36. What is the role of “Chlorophyll” in photosynthesis?
Chlorophyll is a green pigment found in chloroplasts. Its primary role is to trap solar energy from sunlight. This energy is then used to convert water and carbon dioxide into glucose (food) and oxygen. Without chlorophyll, plants could not perform autotrophic nutrition.
37. Explain “Budding” in Yeast.
Budding is an asexual reproduction method. A small bulb-like projection, called a bud, grows out from the parent yeast cell. The nucleus divides, and one part moves into the bud. Eventually, the bud detaches and grows into a new yeast individual, often forming long chains of cells.
38. What is “Red Data Book”?
The Red Data Book is a public document established by the IUCN for recording rare and endangered species of animals, plants, and fungi. It serves as a central database to track extinction risks and guide conservation efforts globally.
39. Why are “Mitochondria” called the powerhouse of the cell?
Mitochondria are responsible for cellular respiration. They break down nutrients (glucose) in the presence of oxygen to release energy in the form of ATP (Adenosine Triphosphate) molecules. This energy is used by the cell for all its metabolic activities.
40. Describe the function of “Platelets” in blood.
Platelets (thrombocytes) are cell fragments responsible for blood clotting. When a blood vessel is injured, platelets aggregate at the site and release chemicals that form a mesh or “clot.” This prevents excessive bleeding and blocks entry for pathogens.
Pedagogy & Teaching Methodology
41. What is the “5E Model” in Science instruction?
The 5E model is an inquiry-based learning cycle consisting of five stages: Engage, Explore, Explain, Elaborate, and Evaluate. It encourages students to build their own understanding through experience and reflection rather than listening to lectures.
42. Why is “Gender Sensitivity” important in a Science classroom?
Science has historically been viewed as a male-dominated field. Gender sensitivity involves using inclusive language, highlighting female scientists, and ensuring that both boys and girls have equal opportunities to perform experiments and lead discussions to break traditional stereotypes.
43. What is the purpose of “Science Exhibitions”?
Exhibitions provide a platform for students to apply theoretical knowledge to practical projects. They foster creativity, scientific temper, and communication skills. It also allows for “Peer Learning” as students observe and learn from their classmates’ models.
44. Explain the “Deductive Approach” in Science.
The deductive approach starts with a general rule or law and applies it to specific cases. For example, a teacher states the law of reflection first, and then students observe it in various experiments. This is often faster for covering vast content but less inquiry-based than induction.
45. What is a “Diagnostic Test” in Science?
A diagnostic test is used to identify the specific learning difficulties or misconceptions a student has regarding a particular topic. Unlike a regular test, its goal is not to grade but to find the “root cause” of a student’s struggle so the teacher can provide remedial help.
46. Define “Scientific Temper.”
Scientific temper is a way of thinking that involves being open-minded, critical, and objective. It means not accepting things at face value but demanding evidence, logic, and reasoning. One of the goals of Science education is to develop this attitude in students.
47. Why should Science be taught through “Integrated Themes”?
Instead of teaching Biology, Physics, and Chemistry in isolation, NCERT recommends an integrated approach. This helps students see the connection between different scientific phenomena (e.g., studying “Water” involves its physical properties, chemical composition, and biological importance).
48. What is the “Heuristic Method”?
Derived from the Greek word Heurisco (I find), this method places the student in the position of a discoverer. The teacher provides minimal guidance, and the student explores, experiments, and finds solutions independently, promoting self-reliance.
49. How can “Anecdotal Records” help a Science teacher?
Anecdotal records are brief, descriptive notes of specific student behaviors or incidents observed by the teacher. In Science, they can track a student’s progress in lab skills, their curiosity during a lesson, or their ability to work in a team.
50. What is “Constructivism” in the context of Science?
Constructivism is the theory that learners “construct” their own knowledge based on their prior experiences. In a Science classroom, this means the teacher acts as a facilitator, helping students connect new scientific concepts to what they already know.
Success in CTET Paper 2 requires more than just reading; it requires consistent practice and the ability to apply scientific principles to pedagogical scenarios. We hope these 50 Science SAQs provide a solid foundation for your revision. Remember, the key to mastering the Science section is a deep dive into NCERT textbooks paired with regular mock testing.
Take the Next Step in Your Teaching Career: Ready to test your knowledge? Don’t just read—evaluate! Head over to our [CTET Paper 2 Science Mock Test Series] at mytestseries.in to access:
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