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Attempt either option… (Class 10 Science SQP 2026-27, Q34A)

questionbuddy.in/q/cbse-10-science-2026-27-sqp-q34a-either-joule-law-heating-happens

ScienceCBSE Class 10 · Sample paper, session 2026-27 · 2 marks · Very short answer

CBSE Class 10 Science sample paper 2026-27: question 34(A)

From the official CBSE sample question paper for 2026-27, section C, question 34(A), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q34(A) · 2 marks · Very short answerElectricity

Attempt either option A or B. A. I. State Joule's Law of heating. II. What happens to the heat produced in a conductor if the resistance is doubled while keeping other variables constant?

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

Heat produced depends on current, resistance and time.

Hint 2

Substitute for in the formula, keeping I and t unchanged.

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. Joule's law of heating: the heat produced in a resistor is directly proportional to

    • the square of the current for a given resistance,
    • the resistance for a given current, and
    • the time for which the current flows.

    So .

    1 mark

  2. II. Keeping the current and time the same, the new heat is

    So the heat produced doubles.

    1 mark

Answer: I. ; II. The heat produced doubles () for the same current and time.

Where the marks are

  • States Joule's law with (1 mark)
  • Shows , so the heat doubles (1 mark)

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 2026-27: 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.