Skip to content

A fuse in electric circuit… (Class 10 Science 2026, Q33A)

questionbuddy.in/q/cbse-10-science-2026-31-4-1-q33a-fuse-electric-circuit-rated-can

ScienceCBSE Class 10 · Board exam 2026, set 31/4/1 · 2 marks · Short answer

CBSE Class 10 Science 2026: question 33(A)

Set in the CBSE Class 10 board exam of 2026, paper 31/4/1, section C, question 33(A), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q33(A) · 2 marks · Short answerCompetency-basedElectricity

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.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/4/1.

Hints

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

Hint 1

Convert 2 kW into watts first.

Hint 2

Find the current from power and voltage, then compare it with the fuse rating.

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. Current drawn by the heater:

    ½ mark

  2. ½ mark

  3. The heater needs 10 A, which is much more than the fuse rating of 4 A. The fuse wire would melt and break the circuit as soon as the heater is switched on. So this fuse cannot be used with the heater.

    1 mark

Answer: No. The heater draws 10 A, which is more than 4 A, so the fuse would melt.

Where the marks are

  • Uses with the values substituted (½ mark)
  • Obtains I = 10 A (½ mark)
  • Concludes that the fuse cannot be used because 10 A > 4 A and it would melt (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Electricity, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/4/1: 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.