CBSE Class 10 Science Sample Paper MCQs
CBSE Class 10 Science Sample Paper MCQs
Class: 10
Subject: Science
Section: Exam Oriented
Topic: CBSE Class 10 Science Sample Paper MCQs
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 10 Science Board Examination preparation.
Subject: Science
Section: Exam Oriented
Topic: CBSE Class 10 Science Sample Paper MCQs
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 10 Science Board Examination preparation.
1. Which of the following is a strong acid?
Answer: A. HCl
Explanation: Hydrochloric acid completely ionizes in water producing high H⁺ concentration, making it a strong acid.
Explanation: Hydrochloric acid completely ionizes in water producing high H⁺ concentration, making it a strong acid.
2. Site of photosynthesis in cells:
Answer: B. Chloroplast
Explanation: Chloroplast contains chlorophyll which captures sunlight for photosynthesis.
Explanation: Chloroplast contains chlorophyll which captures sunlight for photosynthesis.
3. SI unit of focal length:
Answer: A. Meter
Explanation: Focal length is a length quantity; SI unit is meter.
Explanation: Focal length is a length quantity; SI unit is meter.
4. Valency of carbon:
Answer: C. 4
Explanation: Carbon shares four electrons forming covalent bonds.
Explanation: Carbon shares four electrons forming covalent bonds.
5. Blood vessels carrying blood away from heart:
Answer: B. Arteries
Explanation: Arteries transport oxygenated blood from heart to body.
Explanation: Arteries transport oxygenated blood from heart to body.
6. Resistance increases with:
Answer: C. Increase in length
Explanation: R ∝ L. Longer wire → more opposition.
Explanation: R ∝ L. Longer wire → more opposition.
7. Gas turning limewater milky:
Answer: CO₂ — forms CaCO₃ precipitate.
8. Image by convex mirror is always:
Answer: Virtual & diminished — used as rear-view mirrors.
9. Hormone controlling growth:
Answer: Growth hormone — secreted by pituitary gland.
10. Metal extracted by electrolysis:
Answer: Aluminium — highly reactive metal.
11. Unit of electric energy:
Answer: kWh — commercial unit.
12. DNA full form:
Answer: Deoxyribonucleic Acid.
13. Rust formula:
Answer: Hydrated iron(III) oxide.
14. Lens power unit:
Answer: Diopter.
15. Female reproductive organ in flower:
Answer: Pistil.
16. Alloy of copper & tin:
Answer: Bronze.
17. Refractive index formula:
Answer: c/v.
18. Kidney failure treated by:
Answer: Dialysis.
19. CNG main component:
Answer: Methane.
20. Law of conservation of mass given by:
Answer: Lavoisier
Explanation: Mass can neither be created nor destroyed in a chemical reaction.
Explanation: Mass can neither be created nor destroyed in a chemical reaction.