CBSE CLASS 10 PHYSICS MODEL PAPER 2026: THE FINAL PRACTICE SET

 

POST 1: PHYSICS MODEL PAPER (CBSE 10TH - 2026)

Title: Tomorrow's Science Exam: Final Physics Model Paper (Class 10 CBSE 2026)

Labels: Physics, CBSE 2026, Class 10 Science, Last Minute Revision

Physics: Master the Numericals & Ray Diagrams

The Physics section is all about precision. Don't just solve; visualize the light rays and the flow of current.

Section A: MCQs (1 Mark each)

  1. The power of a lens is $-2.0 D$. Its focal length and nature are:

    • (a) $50\text{ cm}$, convex

    • (b) $-50\text{ cm}$, concave

    • (c) $-20\text{ cm}$, concave

    • (d) $20\text{ cm}$, convex

  2. At the time of short circuit, the current in the circuit:

    • (a) reduces substantially

    • (b) does not change

    • (c) increases heavily

    • (d) vary continuously

Section B: Short Answer (2 Marks each)

  1. Why do stars twinkle but planets do not?

  2. Draw a schematic diagram of a circuit consisting of a battery of three cells of $2 V$ each, a $5 \Omega$ resistor, an $8 \Omega$ resistor, and a $12 \Omega$ resistor, and a plug key, all connected in series.

Section C: Analytical (3 Marks each)

  1. An object is placed at a distance of $10\text{ cm}$ from a convex mirror of focal length $15\text{ cm}$. Find the position and nature of the image.

  2. State Fleming’s Left-Hand Rule. What is the role of the split ring in an electric motor?

Section D: Long Answer (5 Marks each)

  1. (a) Derive the expression for the equivalent resistance of three resistors $R_1, R_2,$ and $R_3$ connected in parallel.

    (b) An electric iron consumes energy at a rate of $840 W$ when heating is at the maximum rate and $360 W$ when the heating is at the minimum. The voltage is $220 V$. What are the current and the resistance in each case?

Section E: Case-Study (4 Marks)

  1. The Human Eye: Read the passage about Tyndall effect and scattering of light.

    • (i) Why is the color of the clear sky blue?

    • (ii) Why do danger signal lights use red color?

Final Physics Tip: Always write the SI units ($V, A, \Omega, m$) at the end of your numerical answers. Skipping units can cost you $0.5$ marks!


Post 1: Physics Answer Key

  • Q1: (b) $-50\text{ cm}$, concave. ($f = 1/P = 1/-2.0 = -0.5\text{ m}$).

  • Q2: (c) increases heavily. (Resistance drops to near zero).

  • Q3: Stars are point sources; atmospheric layers with varying refractive indices cause the light to flicker. Planets are closer (extended sources), so the flickering effect cancels out.

  • Q4: Ensure resistors $5\Omega, 8\Omega, 12\Omega$ are in a single line. The total voltage is $6\text{ V}$ ($3 \times 2\text{ V}$).

  • Q5: $v = +6\text{ cm}$. The image is virtual, erect, and diminished, formed behind the mirror.

    • Calculation: $\frac{1}{v} = \frac{1}{15} - \frac{1}{-10} = \frac{2+3}{30} = \frac{5}{30}$.

  • Q6: Fleming’s LHR: Thumb (Force), Forefinger (Magnetic Field), Center finger (Current). Split Ring: Acts as a commutator to reverse current direction every half-rotation.

  • Q7: (b) Case 1 (Max): $I = 3.82\text{ A}, R = 57.60\Omega$. Case 2 (Min): $I = 1.64\text{ A}, R = 134.15\Omega$. (Use $P=VI$ and $V=IR$).

  • Q8: (i) Fine particles in the atmosphere scatter blue light (shorter wavelength) more than red. (ii) Red has the longest wavelength and is least scattered by fog or smoke.

 

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