question_answer

Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as:

Assertion [A]: The true geographic north direction is found by using a compass needle.

Reason (R): The magnetic meridian of the Earth is along the axis of rotation of the Earth.

A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]

B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]

C) Assertion [A] is true but Reason (R) is false

D) Assertion [A] is false and Reason (R) is also false

Correct Answer: D

Solution :

(d) From the compass we are able to know the direction of the magnetic poles. The north of compass points towards the magnetic south pole. If we know the magnetic declination at that particular place (which is angle between geographic meridian and magnetic meridian) we can easily find out the true geographic north-south direction. Imaginary lines drawn along the Earth's surface in the direction of the horizontal component of the magnetic field of the Earth at all points passing through the north and south magnetic poles. This is similar to the longitudes of the Earth, which pass through the geographic north and south poles.