Earth’s Magnetic Field
Physics ⇒ Earth and Space Physics
Earth’s Magnetic Field starts at 8 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Earth’s Magnetic Field.
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See sample questions for grade 10
A student observes that a compass needle points towards the north. Explain why this happens in terms of Earth's magnetism.
Describe the dynamo effect in the context of Earth's magnetic field.
Describe what is meant by the term 'magnetic inclination' or 'dip'.
Explain how Earth's magnetic field helps in animal migration.
Explain why a freely suspended bar magnet always points in the north-south direction.
A student observes that a compass needle points towards the north. Explain why this happens in terms of Earth's magnetism.
A scientist measures the angle of dip at two locations: Location A has a dip of 60°, and Location B has a dip of 10°. Which location is closer to the magnetic pole? Explain your reasoning.
A research station is located at a latitude where the magnetic inclination is 45°. If the horizontal component of Earth's magnetic field at this location is 25 μT, calculate the total magnetic field strength at the station.
What is the approximate value of Earth's magnetic field strength at the surface?
(1) 0.5 Gauss
(2) 50 Gauss
(3) 500 Gauss
(4) 5000 Gauss
Which layer of the Earth is mainly responsible for generating the magnetic field?
(1) Crust
(2) Mantle
(3) Outer core
(4) Inner core
Which of the following best describes the direction of Earth's magnetic field lines at the magnetic equator?
(1) Vertically upward
(2) Vertically downward
(3) Horizontally
(4) Randomly
Which of the following best explains why auroras are seen near the polar regions?
(1) The magnetic field is weakest at the poles
(2) Solar wind particles interact with Earth's magnetic field near the poles
(3) The temperature is lower at the poles
(4) The atmosphere is thinner at the poles
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 imaginary line joining the magnetic north and south poles is called the _______.
The angle between the geographic north and the magnetic north at a given location is called _______.
The process by which Earth's magnetic field protects us from harmful solar radiation is called _______.
True or False: Earth's magnetic field can reverse its polarity over geological time scales.
True or False: The Earth's magnetic field is essential for the existence of life on Earth.
True or False: The Earth's magnetic field is similar to that of a bar magnet placed at its center.
True or False: The Earth's magnetic field is static and does not change over time.
