CBSE Class 10 Science Exam 2026: Top 50 MCQs with Answers for High Score in Exam!

CBSE Class 10th Science Important MCQs: Ace the CBSE Class 10th Science Board Exam 2026 with Top 50 MCQs. The CBSE Class 10th Science Board Exam is fast approaching on February 25th, 2026. To help students secure high scores, particularly in the Multiple-Choice Questions (MCQs) section, we have curated a vital resource.

This compilation features the top 50 high-weightage MCQs, sourced from previous years' question papers and official CBSE sample papers. Solving these questions, which cover all essential chapter topics, is an excellent way to revise thoroughly and boost your exam confidence and performance. Detailed answers are included for efficient preparation.

CBSE Class 10th Science Paper: Key Highlights

Check: CBSE Class 10 Science Exam Pattern 2026 

CBSE Class 10th Science Paper: Breakdown of Marks & Question Paper Structure

Note: Internal choice will be provided within sections, but not in the overall paper.

Check: CBSE Class 10 Sample Paper: Science

CBSE Class 10th Science Exam Top 50 MCQs with Answers

Here are 50 important multiple-choice questions (MCQs) from all chapters in your 10th Science syllabus along with their answers:

Here is the comprehensive list of 50 high-yield MCQs for the CBSE Class 10 Science Exam 2026, covering Physics, Chemistry, and Biology. These questions are based on NCERT guidelines and frequent patterns in previous year papers.

CBSE Class 10 Science: Top 50 MCQs

1. Which of the following is a decomposition reaction?

(A) H2+Cl2→2HCl (B) 2H2O→2H2+O2 (C) Zn+CuSO4→ZnSO4+Cu (D) NaOH+HCl→NaCl+H2O

2. The pH of a neutral solution at 25°C is:

(A) 0 (B) 14 (C) 7 (D) 1

3. In which part of the human body is the process of digestion completed?

(A) Stomach (B) Large Intestine (C) Small Intestine (D) Mouth

4. A lens has a power of -2.0 D. Its focal length is: (A) 50 cm (B) -50 cm (C) 20 cm (D) -20 cm

5. The only metal found in a liquid state at room temperature is: (A) Sodium (B) Mercury (C) Bromine (D) Gallium

6. The xylem tissue in plants is primarily responsible for: (A) Transport of water (B) Transport of food (C) Transport of amino acids (D) Transport of oxygen

7. The SI unit of electrical power is: (A) Volt (B) Ampere (C) Watt (D) Ohm

8. An image formed by a concave mirror is real, inverted, and the same size as the object. The object's position is: (A) At Focus (B) At Infinity (C) At Center of curvature (D) Between C and F

9. The acid found in an ant sting is: (A) Acetic acid (B) Citric acid (C) Methanoic acid (D) Oxalic acid

10. The refractive index of diamond is: (A) 1.33 (B) 1.50 (C) 2.42 (D) 1.00

11. The functional gap between two neurons is called a: (A) Dendrite (B) Synapse (C) Axon (D) Impulse

12. Butanone is a four-carbon compound belonging to the functional group: (A) Carboxylic acid (B) Aldehyde (C) Ketone (D) Alcohol

13. Which part of the brain is responsible for maintaining posture and equilibrium? (A) Forebrain (B) Cerebellum (C) Medulla (D) Pons

14. The resistance of a uniform metallic conductor is inversely proportional to its: (A) Length (B) Area of cross-section (C) Temperature (D) Resistivity

15. A solution turns red litmus blue; its pH value is likely to be: (A) 1 (B) 4 (C) 5 (D) 10

16. The basic functional unit of the human kidney is the: (A) Neuron (B) Nephron (C) Alveoli (D) Villi

17. Which gas is produced when zinc granules react with dilute sulphuric acid? (A) O2 (B) CO2 (C) H2 (D) N2

18. The least distance of distinct vision for a normal young adult eye is about: (A) 25 m (B) 2.5 cm (C) 25 cm (D) 2.5 m

19. In a flower, the anthers contain: (A) Sepals (B) Ovules (C) Carpel (D) Pollen grains

20. Which type of mirror is used as a rear-view mirror in motor vehicles? (A) Plane mirror (B) Concave mirror (C) Convex mirror (D) None of these

21. The chemical formula of Plaster of Paris is: (A) CaSO4⋅2H2O (B) CaSO4⋅21H2O (C) CaSO4⋅H2O (D) 2CaSO4⋅H2O

22. The SI unit of resistivity ($\rho$) is: (A) Ohm (B) Ohm-meter (C) Ampere (D) Volt

23. Exchange of genetic material occurs in which type of reproduction? (A) Vegetative reproduction (B) Asexual reproduction (C) Sexual reproduction (D) Budding

24. Which of the following is an example of a plant hormone? (A) Insulin (B) Thyroxin (C) Oestrogen (D) Cytokinin

25. The device used to produce electric current is called a: (A) Generator (B) Galvanometer (C) Ammeter (D) Motor

26. The splitting of white light into its component colors is called: (A) Reflection (B) Dispersion (C) Refraction (D) Scattering

27. Ethane, with the molecular formula C2H6, has: (A) 6 covalent bonds (B) 7 covalent bonds (C) 8 covalent bonds (D) 9 covalent bonds

28. An example of a homologous pair of organs is: (A) Our arm and a dog's foreleg (B) Our teeth and an elephant's tusks (C) Potato and runners of grass (D) All of the above

29. The primary source of energy for an ecosystem is: (A) Sunlight (B) RNA (C) DNA (D) Green plants

30. Which element has the electronic configuration 2, 8, 2? (A) Sodium (B) Aluminium (C) Magnesium (D) Silicon

31. The movement of food in the phloem is called: (A) Translocation (B) Transpiration (C) Respiration (D) Evaporation

32. A magnetic field line represents the direction of the: (A) Magnetic force (B) Magnetic field (C) Electric current (D) North pole

33. Which mirror has a wider field of view? (A) Concave mirror (B) Plane mirror (C) Convex mirror (D) Cylindrical mirror

34. The genotype of a pure tall pea plant is represented by: (A) Tt (B) tt (C) tT (D) TT

35. The chief constituent of biogas is: (A) Methane (B) Ethane (C) Propane (D) Butane

36. Rusting of iron is an example of: (A) Reduction (B) Hydrogenation (C) Oxidation (D) Sublimation

37. The female germ cells in plants are produced in the: (A) Stamen (B) Ovary (C) Style (D) Stigma

38. The heating element of an electric iron is made of: (A) Copper (B) Iron (C) Nichrome (D) Aluminium

39. Ozone layer depletion is mainly caused by: (A) CO2 (B) CFCs (C) CH4 (D) O2

40. Bile juice is secreted by the: (A) Stomach (B) Liver (C) Pancreas (D) Small Intestine

41. The focal length of a plane mirror is: (A) Zero (B) One (C) Infinity (D) Negative

42. Non-metals generally form: (A) Basic oxides (B) Amphoteric oxides (C) Acidic oxides (D) Neutral oxides

43. A zygote which has an X-chromosome inherited from the father will develop into a: (A) Boy (B) Girl (C) X-chromosome does not determine sex (D) Either boy or girl

44. The formula for magnification ($m$) of a lens is: (A) v/u (B) −v/u (C) u/v (D) h/h′

45. Cinnabar is an ore of: (A) Copper (B) Mercury (C) Iron (D) Zinc

46. What is the common name of Sodium Hydrogen Carbonate? (A) Washing Soda (B) Bleaching Powder (C) Caustic Soda (D) Baking Soda

47. The opening and closing of the stomatal pore is a function of the: (A) Guard cells (B) Chloroplasts (C) Stomata (D) Villi

48. In an electric circuit, the ammeter is always connected in: (A) Parallel (B) Any way (C) Series (D) None of these

49. Vegetative propagation refers to the formation of new plants from: (A) Stem, roots, and flowers (B) Stem, roots, and leaves (C) Stem, flowers, and fruits (D) Stem, leaves, and flowers

50. The material used for the filament of an incandescent bulb is: (A) Tungsten (B) Copper (C) Aluminium (D) Nichrome

CBSE Class 10 Science Answer Key

Mastering these top 50 MCQs is a crucial step towards securing an excellent score in the CBSE Class 10 Science Board Exam 2026. By thoroughly reviewing these questions and their explanations, you have strengthened your grasp on core concepts across the syllabus. Remember to manage your time wisely during the exam and use these high-yield questions as a final check of your preparation. All the best for your examination!