CBSE Class 10 Science Model Paper 2026: Solved Practice Set for Board Success

 

CBSE Class 10 Science Model Paper 2026: Solved Practice Set for Board Success

Scoring a centum in the CBSE Class 10 Science board exam 2026 requires a strategic balance between understanding theory and mastering diagrams. This Class 10 Science Model Paper follows the official 80-mark blueprint, dividing the subject into Chemistry, Biology, and Physics. Whether you are revising the reactivity series or practicing ray diagrams, this paper will test your readiness for the 2026 examination.

Section A: Objective Type Questions (20 Marks)

Q1. A student heats lead nitrate powder in a boiling tube. What observation will be recorded?

(a) Evolution of colorless gas.

(b) Formation of a green residue.

(c) Evolution of brown fumes of $NO_{2}$.

(d) Formation of a blue precipitate.

Q2. When $CO_{2}$ gas is passed through lime water, it turns milky. On passing excess $CO_{2}$, the milkiness disappears due to the formation of:

(a) $CaCO_{3}$

(b) $Ca(HCO_{3})_{2}$

(c) $CaO$

(d) $Ca(OH)_{2}$

Q3. The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in:

(a) Cytoplasm

(b) Mitochondria

(c) Chloroplast

(d) Nucleus

Q4. An object is placed at the center of curvature ($C$) of a concave mirror. The magnification produced is:

(a) $+1$

(b) $-1$

(c) $+2$

(d) $-2$

Q5. Resistance of a metallic wire is $R$. If the length of the wire is doubled and the area of cross-section is halved, the new resistance will be:

(a) $2R$

(b) $R$

(c) $4R$

(d) $R/2$

Q6. Assertion (A): Silver articles become black after sometime when exposed to air.

Reason (R): Silver reacts with sulfur in the air to form a coating of silver sulfide ($Ag_{2}S$).

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

Section B: Short Answer Questions (12 Marks)

Q7. Write the balanced chemical equations for the following:

(i) Sodium + Water $\rightarrow$ Sodium hydroxide + Hydrogen

(ii) Calcium carbonate $\rightarrow$ Calcium oxide + Carbon dioxide

Q8. List two functions of the human brain. Which part of the brain is responsible for maintaining the posture and balance of the body?

Q9. State the two laws of reflection of light.

Section C: Short Answer Questions - II (21 Marks)

Q10. What are amphoteric oxides? Give two examples with their chemical equations reacting with an acid and a base.

Q11. (a) Draw a labeled diagram of the human excretory system.

(b) Define transpiration and explain its importance in plants.

Q12. What is Magnetic Field? List the properties of magnetic field lines around a bar magnet.

Section D: Long Answer Questions (15 Marks)

Q13. (a) Define Saponification. Write the chemical equation involved.

(b) Why are soaps not effective in hard water? How do detergents solve this problem?

Q14. (a) Explain the double circulation of blood in human beings. Why is it necessary?

(b) Draw a neat diagram of the Human Heart showing the flow of blood.

Shutterstock

Q15. (a) A person is unable to see objects clearly beyond $2 \text{ m}$. Name the defect he is suffering from.

(b) List two causes of this defect.

(c) Draw a ray diagram showing (i) the defective eye and (ii) its correction using a suitable lens.

Section E: Case-Based Questions (12 Marks)

Q16. Case Study: Electricity

A wire of resistance $10 \Omega$ is bent in the form of a closed circle.

(i) What is the effective resistance between the two points at the ends of any diameter? (1M)

(ii) If a potential difference of $5 \text{ V}$ is applied across the diameter, find the current flowing through each semi-circle. (2M)

(iii) How does the resistance of a wire change if its temperature increases? (1M)

✅ Answer Key & Explanations

Chemistry

  • Q1: (c) Thermal decomposition of Lead Nitrate produces Nitrogen Dioxide (brown fumes).

  • Q2: (b) Excess $CO_{2}$ forms soluble Calcium Bicarbonate, $Ca(HCO_{3})_{2}$.

  • Q10: Amphoteric oxides are $Al_{2}O_{3}$ and $ZnO$. They react with both acids (forming salt/water) and bases (forming aluminates/zincates).

Biology

  • Q3: (b) Aerobic respiration occurs in the mitochondria.

  • Q14: Double circulation includes pulmonary (heart-lungs) and systemic (heart-body) circulation. It prevents the mixing of oxygenated and deoxygenated blood, essential for high-energy organisms like mammals.

Physics

  • Q4: (b) At $C$, image is real, inverted, and same size. $m = \frac{-v}{u} = -1$.

  • Q5: (c) $R = \rho \frac{l}{A}$. If $l \rightarrow 2l$ and $A \rightarrow A/2$, then $R' = \rho \frac{2l}{A/2} = 4R$.

  • Q15: The person has Myopia (Near-sightedness). It is caused by excessive curvature of the lens or elongation of the eyeball. Correction: Concave lens.

Student Tip for 2026 Boards:

Don't just memorize reactions—understand the type (Decomposition, Redox, etc.). For Physics, always write the units (Ohms, Volts, Amperes) in your final numerical answer to avoid losing half a mark!

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