SET - 2 SCIENCE MCQs 20 (MCQS for Class 10 Science subject based on NCERT)

Class 10 Science MCQs

Class 10 Science MCQs

Here are 20 Multiple Choice Questions (MCQs) for Class 10 Science based on the CBSE syllabus. These questions cover topics from Physics, Chemistry, and Biology.

Physics

1. What is the SI unit of electric current?

a) Volt

b) Ampere

c) Ohm

d) Watt

Answer: b) Ampere

2. Which of the following is NOT a renewable source of energy?

a) Solar energy

b) Wind energy

c) Coal

d) Hydropower

Answer: c) Coal

3. The focal length of a convex mirror is 20 cm. Its radius of curvature is:

a) 10 cm

b) 20 cm

c) 40 cm

d) 5 cm

Answer: c) 40 cm

4. Which of the following materials is the best conductor of electricity?

a) Wood

b) Copper

c) Rubber

d) Plastic

Answer: b) Copper

5. The phenomenon of splitting white light into its constituent colors is called:

a) Reflection

b) Refraction

c) Dispersion

d) Scattering

Answer: c) Dispersion

Chemistry

6. Which gas is evolved when dilute hydrochloric acid reacts with sodium carbonate?

a) Hydrogen

b) Oxygen

c) Carbon dioxide

d) Chlorine

Answer: c) Carbon dioxide

7. The chemical formula of baking soda is:

a) NaOH

b) NaHCO₃

c) Na₂CO₃

d) NaCl

Answer: b) NaHCO₃

8. Which of the following is a strong acid?

a) Acetic acid

b) Citric acid

c) Hydrochloric acid

d) Carbonic acid

Answer: c) Hydrochloric acid

9. The process of conversion of sugar into alcohol is called:

a) Fermentation

b) Distillation

c) Oxidation

d) Reduction

Answer: a) Fermentation

10. Which of the following is a non-metal that is liquid at room temperature?

a) Mercury

b) Bromine

c) Sodium

d) Iodine

Answer: b) Bromine

Biology

11. Which gland in the human body is called the "master gland"?

a) Thyroid gland

b) Pituitary gland

c) Adrenal gland

d) Pancreas

Answer: b) Pituitary gland

12. The process of loss of water in the form of water vapor from the leaves is called:

a) Transpiration

b) Photosynthesis

c) Respiration

d) Evaporation

Answer: a) Transpiration

13. Which of the following is NOT a part of the human digestive system?

a) Stomach

b) Liver

c) Kidney

d) Small intestine

Answer: c) Kidney

14. The smallest unit of life is:

a) Tissue

b) Cell

c) Organ

d) Molecule

Answer: b) Cell

15. Which of the following is a greenhouse gas?

a) Oxygen

b) Nitrogen

c) Carbon dioxide

d) Hydrogen

Answer: c) Carbon dioxide

Mixed Questions

16. Which of the following is a decomposition reaction?

a) 2H₂ + O₂ → 2H₂O

b) CaCO₃ → CaO + CO₂

c) NaOH + HCl → NaCl + H₂O

d) Zn + CuSO₄ → ZnSO₄ + Cu

Answer: b) CaCO₃ → CaO + CO₂

17. The image formed by a concave mirror is virtual, erect, and enlarged when the object is placed:

a) At focus

b) Between focus and pole

c) At the center of curvature

d) Beyond the center of curvature

Answer: b) Between focus and pole

18. Which of the following is a plant hormone?

a) Insulin

b) Thyroxine

c) Auxin

d) Adrenaline

Answer: c) Auxin

19. The resistance of a conductor is inversely proportional to its:

a) Length

b) Area of cross-section

c) Temperature

d) Material

Answer: b) Area of cross-section

20. Which of the following is NOT a part of the neuron?

a) Axon

b) Dendrite

c) Nephron

d) Cell body

Answer: c) Nephron

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