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5. Magnetism and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics5. Magnetism and matter1 Mark
MCQ
Assertion : The true geographic north direction is found by using a compass needle.

Reason : The magnetic meridian of the earth is along the axis of rotation of the earth.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • ✓
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: D.
If both the Assertion and Reason are incorrect.
d
The true geographic north-south direction is inclined at an angle with magnetic north-south direction. The angle between them is known as declination. Compass needle gives us direction of north-south (magnetic) direction. Magnetic meridian to pass through magnetic north-south direction. Axis of rotation of the earth gives us geographic north-south direction. So, both Assertion and Reason are incorrect.

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