CBSE Class 10 Science Sample Paper Set 3 — Free PDF
This comprehensive sample paper covers Physics, Chemistry, and Biology chapters with a balanced mix of theoretical and practical questions. Master all conc
TL;DR: This comprehensive sample paper covers Physics, Chemistry, and Biology chapters with a balanced mix of theoretical and practical questions. Master all…
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This comprehensive sample paper covers Physics, Chemistry, and Biology chapters with a balanced mix of theoretical and practical questions. Master all concepts with original CBSE-pattern problems and detailed answers. This is a shortened practice set: 38 questions worth 74 marks, following the 80-mark CBSE paper pattern. Use it for timed practice, not as a full-length mock.
Board: CBSE · Class: Class 10 · Subject: Science · Total: 74 marks · Time: 3 hours
Section A - Multiple Choice and Very Short Answer — 20 marks
Attempt all questions. Each question carries 1 mark.
Q1. What is the SI unit of force? (1 mark)
Answer: Newton (N)
Q2. The process by which green plants make their own food is called? (1 mark)
Answer: Photosynthesis
Q3. What is the atomic number of Oxygen? (1 mark)
Answer: 8
Q4. The speed of light in vacuum is approximately? (1 mark)
Answer: 3 x 10^8 m/s or 300000 km/s
Q5. What is the pH of pure water at 25 degrees Celsius? (1 mark)
Answer: 7
Q6. Which hormone is responsible for fight or flight response? (1 mark)
Answer: Adrenaline or Epinephrine
Q7. What is the principal focus of a concave mirror? (1 mark)
Answer: The point where light rays converge after reflection
Q8. The process of conversion of chemical energy into electrical energy is? (1 mark)
Answer: Electrochemistry or cell reaction
Q9. What is the function of stomata in plants? (1 mark)
Answer: Gas exchange and transpiration
Q10. Which metal is liquid at room temperature? (1 mark)
Answer: Mercury
Q11. The SI unit of electric current is? (1 mark)
Answer: Ampere (A)
Q12. What is the process of reproduction in Hydra called? (1 mark)
Answer: Budding
Q13. The number of valence electrons in Chlorine is? (1 mark)
Answer: 7
Q14. What is the focal length of a plane mirror? (1 mark)
Answer: Infinity
Q15. The transfer of heat by movement of fluids is called? (1 mark)
Answer: Convection
Q16. Which vitamin is produced in our body when exposed to sunlight? (1 mark)
Answer: Vitamin D
Q17. The SI unit of power is? (1 mark)
Answer: Watt (W)
Q18. What is the chromosomal number in human cells? (1 mark)
Answer: 46 or 23 pairs
Q19. The process of removing ions from a solution is called? (1 mark)
Answer: Deionization or ion exchange
Q20. What is the refractive index of glass approximately? (1 mark)
Answer: 1.5
Section B - Short Answer — 28 marks
Attempt all questions. Each question carries 2 or 3 marks.
Q1. Draw a ray diagram for image formation in a convex lens when object is at 2F. (2 marks)
Answer: Real, inverted, equal-sized image formed at 2F on opposite side
Q2. What is the difference between exothermic and endothermic reactions? Give one example each. (3 marks)
Answer: Exothermic releases heat (combustion), Endothermic absorbs heat (melting ice)
Q3. Explain the process of photosynthesis with a balanced equation. (3 marks)
Answer: 6CO2 + 6H2O + light energy -> C6H12O6 + 6O2
Q4. State Ohms Law and write its mathematical formula. (2 marks)
Answer: V = IR where V is voltage, I is current, R is resistance
Q5. How do plants and animals differ in reproduction methods? (2 marks)
Answer: Plants reproduce by seeds and vegetative means, animals mostly by sexual reproduction
Q6. What is electromagnetic induction? Explain with example. (3 marks)
Answer: Change in magnetic flux induces electric current, example: electric generator
Q7. Write the properties of acids and bases. (2 marks)
Answer: Acids are sour, corrosive, turn litmus red; Bases are bitter, soapy, turn litmus blue
Q8. Explain the structure of mitochondria and its function. (2 marks)
Answer: Double membrane organelle with inner cristae, site of ATP production and energy release
Q9. Calculate the resistance of a wire with resistivity 1.7 x 10^-8, length 2m, area 1mm^2. (2 marks)
Answer: R = (1.7 x 10^-8 x 2) / (10^-6) = 0.034 ohm
Q10. What are the three states of matter? How do they differ? (3 marks)
Answer: Solid (fixed shape), Liquid (fixed volume), Gas (no fixed shape or volume)
Q11. Explain the mechanism of refraction of light. (2 marks)
Answer: Light bends when entering denser medium due to change in speed
Q12. What is a food web and how does it differ from food chain? (2 marks)
Answer: Food web is interconnected food chains showing multiple feeding relationships
Section C - Long Answer — 26 marks
Attempt all questions. Each question carries 3 or 5 marks.
Q1. Explain the process of refraction of light with Snells law. Draw a ray diagram. (5 marks)
Answer: sin(i)/sin(r) = n2/n1, where i is incident angle, r is refraction angle, n is refractive index
Q2. Describe the structure and function of the human digestive system. (5 marks)
Answer: Mouth (ingestion), Esophagus, Stomach (churning), Small intestine (absorption), Large intestine (water absorption)
Q3. Explain the process of binary fission in bacteria with diagram. (3 marks)
Answer: DNA replication followed by division into two identical daughter cells
Q4. How is electricity generated in thermal power plants? Explain the complete process. (5 marks)
Answer: Burning of fuel heats water, steam turns turbine, turbine rotates generator, producing electricity
Q5. Describe the nitrogen cycle and its importance in ecosystem. (5 marks)
Answer: Nitrogen fixation by bacteria, conversion to nitrates, uptake by plants, return to atmosphere through decomposition
Q6. Explain the principle and working of an electric motor. (3 marks)
Answer: Current-carrying coil rotates in magnetic field due to force on opposite sides, producing motion
FAQs
What is the total marks and duration of Class 10 Science exam?
The exam is for 80 marks with 3 hours duration, covering Physics, Chemistry, and Biology sections.
How many chapters are in Class 10 Science syllabus?
There are 16 chapters in total: 5 in Chemistry, 5 in Physics, and 6 in Biology.
What topics should I focus on most for scoring well?
Focus on concepts like photosynthesis, respiration, heredity, chemical reactions, electricity, light and optics, which frequently appear in exams.
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