At point A on the earth's surface, the angle of dip is, δ=+25°. At a point B on the earth's surface, the angle of dip is, δ=-25°. We can interpret that:

1. A and B are both located in the southern hemisphere.

2. A and B are both located in the northern hemisphere.

3. A is located in the southern hemisphere and B is located in the northern hemisphere.

4. A is located in the northern hemisphere and B is located in the southern hemisphere.

Subtopic:  Earth's Magnetism |
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The relation amongst the three elements of Earth's magnetic field, namely horizontal component H, vertical component V and dip angle δ is: (BE=total magnetic field)

1. V=BEtanδ, H=BE

2. V=BEsinδ, H=BEcosδ

3. V=BEcosδ, H=BEsin δ

4. V=BE, H=BEtanδ 

Subtopic:  Earth's Magnetism |
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If θ1  and θ2 are the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by:
1. tan2θ=tan2θ1+tan2θ2
2. cot2θ=cot2θ1-cot2θ2
3. tan2θ=tan2θ1+tan2θ2
4. cot2θ=cot2θ1+cot2θ2

Subtopic:  Earth's Magnetism |
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A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

1. will become rigid showing no movement

2. will stay in any position

3. will stay in north-south direction only

4. will stay in east-west direction only

Subtopic:  Earth's Magnetism |
To view explanation, please take trial in the course below.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology