PYQ Vault

Day 6: CBSE Class 10 Science

5 questions. Try each one first, then open its answer.

  1. Question 1

    Electricity. Asked 3 times: 2022*, 2025*, 2026 (* = numbers or wording changed that year)

    34 (a)
    The resistance of a wire of 0.01 cm radius and 1.0 cm length is 7 Ω7\,\Omega. Calculate its resistivity.

  2. Question 2

    Electricity. Asked 3 times: 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    33 (A)
    A fuse in electric circuit is rated 4 A. Can it be used with an electric heater of rating 2 kW, 200 V ? Explain your answer.

  3. Question 3

    Electricity. Asked 3 times: 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    34
    (a) Define volt, the unit of potential difference. (b) Calculate the work done required to move an electron between two points A and B located at a potential difference of 100 V in an electric field.

  4. Question 4

    Electricity. Asked 3 times: 2023*, 2024*, 2026 (* = numbers or wording changed that year)

    37
    (a) Why does an electric bulb become dim when an electric heater in parallel circuit is switched ON ? (b) How to connect three resistors each of resistance 8 Ω8\,\Omega, so that the equivalent resistance of the combination is 12 Ω12\,\Omega ? Draw diagram of the combination and justify your answer.

  5. Question 5

    Heredity. Asked 3 times: 2024*, 2025*, 2026 (* = numbers or wording changed that year)

    13
    Based on Mendel’s experiment show the cross between round, yellow seeds of pea plant (RRYY) with wrinkled and green seeds of pea plant (rryy) upto F2\mathrm{F_2} generation. Write the number of seeds/plants with following genetic (Genotype) makeup in F2\mathrm{F_2} generation : (i) RRYY (ii) rryy