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Assertion: A compass… (Class 10 Science SQP 2023-24, Q19)

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ScienceCBSE Class 10 · Sample paper, session 2023-24 · 1 mark · Assertion-reason

CBSE Class 10 Science sample paper 2023-24: question 19

From the official CBSE sample question paper for 2023-24, 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 compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of the current in the wire is increased.
Reason: The strength of a magnetic field at a point near the conductor increases on increasing the current.

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

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

How does field strength depend on current?

Hint 2

A stronger field gives more or less deflection?

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. Reason: The magnetic field near a conductor gets stronger when the current increases. The Reason is true.

  2. A stronger field deflects the needle more, so the deflection increases. The Assertion is false, and the answer is option (D).

    1 mark

Answer: Option (D)

Where the marks are

  • States deflection increases with current (A false), R true (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 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.