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Assertion (A): No two… (Class 10 Science 2025, Q19)

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ScienceCBSE Class 10 · Board exam 2025, set 31/1/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2025: question 19

Set in the CBSE Class 10 board exam of 2025, paper 31/1/1, section A, question 19, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q19 · 1 mark · Assertion-reasonCompetency-basedMagnetic Effects of Electric Current

Assertion (A): No two magnetic field lines are found to cross each other.
Reason (R): The compass needle cannot point towards two directions at the point of intersection of two magnetic field lines.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/1/1.

Hints

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

Hint 1

What does a compass needle show at a point in a magnetic field?

Hint 2

What would a crossing point mean for the field direction?

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. Field lines never cross each other, so the Assertion is true.

  2. If two lines crossed, the field would have two directions at that point. A compass needle cannot point two ways at once, so the Reason is true.

  3. The Reason correctly explains the Assertion. The answer is option (A).

    1 mark

Answer: Option (A)

Where the marks are

  • Chooses option (A) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Magnetic Effects of Electric Current, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/1/1: 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.