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Answer the following. (Class 10 Science SQP 2023-24, Q32)

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ScienceCBSE Class 10 · Sample paper, session 2023-24 · 3 marks · Short answer

CBSE Class 10 Science sample paper 2023-24: question 32

From the official CBSE sample question paper for 2023-24, section C, question 32, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q32 · 3 marks · Short answerElectricity

Answer the following.

  1. (i)

    State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.

    2 marks
  2. (ii)

    List the factors on which the resistance of a conductor depends.

    1 mark

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

Open one hint at a time and try again before the next.

Hint 1

Which law gives the heat produced by a current in a resistor?

Hint 2

Write the heat produced in terms of current, resistance and time. For resistance, think of .

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (i) The law is Joule's law of heating.

    ½ mark

  2. It states that the heat H produced in a resistor is directly proportional to: (a) the square of the current through it, ; (b) its resistance, ; (c) the time for which the current flows, .

    1 mark

  3. Combining these: (H in joules, I in amperes, R in ohms, t in seconds).

    ½ mark

  4. (ii) The resistance of a conductor depends on: its length (); its area of cross-section (); the nature of its material (resistivity); and its temperature.

    1 mark

Answer: (i) Joule's law of heating: , i.e. heat ∝ , ∝ R, ∝ t. (ii) Length, area of cross-section, nature of material, temperature.

Where the marks are

  • Names Joule's law of heating (0.5 mark)
  • States H ∝ , H ∝ R, H ∝ t, or writes (1.5 marks)
  • Lists any two factors affecting resistance (0.5 + 0.5 marks)

Revise the chapter

  • Chapter: Electricity (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Electricity, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2023-24: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.