Earth’s Magnetism
Physics ⇒ Electricity and Magnetism
Earth’s Magnetism starts at 9 and continues till grade 12.
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See sample questions for grade 10
A freely suspended magnet always aligns itself in which direction?
Define magnetic declination.
Describe what would happen if the Earth’s magnetic field disappeared suddenly.
Explain what is meant by the term ‘magnetic meridian’.
Explain why the magnetic declination varies from place to place on the Earth.
A scientist measures the angle of dip at two different locations: Location A has an angle of dip of 0°, and Location B has an angle of dip of 90°. What can you infer about the positions of these two locations on Earth?
A compass is taken from the equator to the magnetic pole. Describe and explain the changes observed in the behavior of the compass needle.
A geologist finds a rock sample whose magnetic minerals are aligned at an angle of 45° to the current direction of the Earth's magnetic field at that location. What does this suggest about the Earth's magnetic field in the past?
Which of the following best describes the Earth’s magnetic field?
(1) It is exactly aligned with the geographic axis.
(2) It is tilted with respect to the geographic axis.
(3) It does not exist.
(4) It is only present at the equator.
Which of the following best explains why a compass needle points north?
(1) It is attracted to the geographic north pole.
(2) It aligns with the Earth’s magnetic field.
(3) It is affected by gravity.
(4) It is repelled by the south pole.
Which of the following instruments is used to measure the direction of the Earth’s magnetic field?
(1) Barometer
(2) Galvanometer
(3) Magnetic compass
(4) Voltmeter
Which of the following is NOT a possible cause of the Earth’s magnetism?
(1) Electric currents in the Earth’s core
(2) The presence of large iron deposits on the surface
(3) The motion of molten iron in the outer core
(4) The rotation of the Earth
Fill in the blank: The Earth’s magnetic field lines emerge from the _______ magnetic pole and enter the _______ magnetic pole.
Fill in the blank: The magnetic equator is the place where the angle of dip is _______.
The angle between the geographic meridian and the magnetic meridian at a place is called _______.
The angle made by the Earth’s total magnetic field with the horizontal direction in the magnetic meridian is called _______.
True or False: The Earth’s magnetic field can reverse its direction over geological time scales.
True or False: The Earth’s magnetic field is generated by the movement of molten iron in its outer core.
True or False: The Earth’s magnetic field is responsible for the auroras near the polar regions.
True or False: The Earth’s magnetic field is uniform everywhere on the surface of the Earth.
