Electricity

CBSE Class 10 · Science · 23 past questions

1. Q1 2026

   The resistance of a wire of 0.01 cm radius and 1.0 cm length is 7 $\Omega$. Calculate its resistivity.

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2. Q2 2026

   The correct way to connect an ammeter and a voltmeter in an electric circuit is…

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3. Q3 2026

   Consider the given electric circuit… (with a figure)

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4. Q4 2026

   The values of current $I$ flowing in a given resistor for the corresponding values of potential difference…

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5. Q5 Sample paper 2026-27

   An electrical appliance rated 1000 W is operated at 250 V. What current does it draw?

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6. Q6 Sample paper 2026-27

   Attempt either option A or B.

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7. Q7 Sample paper 2026-27

   The figure shows a circuit with a 15 V battery connected to several resistors. Using the given circuit… (with a figure)

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8. Q8 2025

   An electric bulb is connected to a power supply of 220 V. If the current drawn by the bulb from the supply is…

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9. Q9 2025

   For Questions number 17 to 20, two statements are given — one labelled as Assertion (A) and the other…

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10. Q10 2025

    An electric kettle is rated 750 W; 220 V. Can this kettle be used in a circuit which has a fuse of current…

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11. Q11 2025

    A wire of length 'l' is gradually stretched so that its length increases to $3l$. If its original resistance…

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12. Q12 2025

    An electric kettle is rated 230 V; 1000 W. Calculate the resistance of its heating element when in operation.

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13. Q13 2024

    The maximum resistance of a network of five identical resistors of $\frac{1}{5}\ \Omega$ each can be –

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14. Q14 2024

    In case of four wires of same material, the resistance will be minimum if the diameter and length of the wire…

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15. Q15 2024

    Explain in brief the function of an electric fuse in a domestic circuit. An electric heater of current rating…

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16. Q16 2024

    Show how you would connect three resistors each of resistance 6 Ω, so that the combination has a resistance…

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17. Q17 2023

    If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective…

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18. Q18 2023

    In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have

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19. Q19 2023

    Two LED bulbs of 12W and 6W are connected in series. If the current through 12W bulb is 0.06A the current…

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20. Q20 2023

    The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical…

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21. Q21 2023

    For verifying Ohm’s law, we design an electric circuit diagram in which we show the arrangement of different…

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22. Q22 2023

    V – I graph for two conducting wires A and B are as shown. If both wires are of the same length and same… (with a figure)

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23. Q23 2023

    Consider the following electrical circuit diagram in which nine identical resistors of 3 Ω each are connected… (with a figure)

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