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Consider the following statements:
There is slight flattening of the earth at the equator and slight bulging at the poles.
On any given day, the position of the Earth's magnetic poles moves by a few meters.
The polarity of the Earth's magnetic field has remained the same since the formation of the Earth.
Which of the statements given above is/are correct?
- a)1 only
- b)2 only
- c)2 and 3 only
- d)1 and 3 only
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements: There is slight flattening of th...
- While the Earth appears to be round when viewed from the vantage point of space, it is actually closer to an ellipsoid. It is slightly flattened at the North and the South Poles and bulge in the middle. Its equatorial radius is 6378 km, but its polar radius is 6357 km - in other words, the Earth is slightly flattened. This is due to the centrifugal force created by the earth’s constant rotation. Hence statement 1 is not correct.
- The magnetic poles of the earth are not fixed on the surface but wander quite a bit. The pole in the Northern Hemisphere seems to be moving northwards in geographic latitude by about 10 kilometers per year, but the motion is only an average. On any given day, it moves erratically by many tens of meters because of changes in the currents inside earth's core, as well as the influence of electrical currents in the ionosphere, and the changing space environment due to solar storms and winds. Hence statement 2 is correct.
- By dating the rocks on either side of the Mid Oceanic Ridge in the Atlantic Ocean, geologists discovered that the polarity of the Earth's field changes over the course of thousands of years. They are called Polarity Reversals. There have been about 170 of these reversals during the last 76 million years according to geological evidence. We are currently living during a period that has been called the Brunhes Magnetic Chron when the South Magnetic Pole is in the Northern Hemisphere. During the previous Matumaya Magnetic Chron, the North Magnetic Pole was in the Northern Hemisphere. Presently, Earth's magnetic field is weakening in strength by 5% every 100 years. It may be near zero in another few thousand years at this rate. Hence statement 3 is not correct.
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Consider the following statements: There is slight flattening of th...
Explanation:
- Slight flattening of the earth at the equator and slight bulging at the poles: This statement is correct. The Earth is not a perfect sphere; it is an oblate spheroid. This means that it is slightly flattened at the poles and slightly bulging at the equator due to its rotation.
- On any given day, the position of the Earth's magnetic poles moves by a few meters: This statement is also correct. The Earth's magnetic poles are not fixed and their positions can shift slightly over time. This movement is known as geomagnetic secular variation.
- The polarity of the Earth's magnetic field has remained the same since the formation of the Earth: This statement is incorrect. The Earth's magnetic field has undergone numerous reversals in polarity throughout its history. These reversals are recorded in the rocks of the Earth's crust and provide important information about the Earth's geologic past.
Therefore, the correct answer is 2 only (b).
- Slight flattening of the earth at the equator and slight bulging at the poles: This statement is correct. The Earth is not a perfect sphere; it is an oblate spheroid. This means that it is slightly flattened at the poles and slightly bulging at the equator due to its rotation.
- On any given day, the position of the Earth's magnetic poles moves by a few meters: This statement is also correct. The Earth's magnetic poles are not fixed and their positions can shift slightly over time. This movement is known as geomagnetic secular variation.
- The polarity of the Earth's magnetic field has remained the same since the formation of the Earth: This statement is incorrect. The Earth's magnetic field has undergone numerous reversals in polarity throughout its history. These reversals are recorded in the rocks of the Earth's crust and provide important information about the Earth's geologic past.
Therefore, the correct answer is 2 only (b).
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Consider the following statements: There is slight flattening of the earth at the equator and slight bulging at the poles. On any given day, the position of the Earth's magnetic poles moves by a few meters. The polarity of the Earth's magnetic field has remained the same since the formation of the Earth. Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)2 and 3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?
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Consider the following statements: There is slight flattening of the earth at the equator and slight bulging at the poles. On any given day, the position of the Earth's magnetic poles moves by a few meters. The polarity of the Earth's magnetic field has remained the same since the formation of the Earth. Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)2 and 3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements: There is slight flattening of the earth at the equator and slight bulging at the poles. On any given day, the position of the Earth's magnetic poles moves by a few meters. The polarity of the Earth's magnetic field has remained the same since the formation of the Earth. Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)2 and 3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements: There is slight flattening of the earth at the equator and slight bulging at the poles. On any given day, the position of the Earth's magnetic poles moves by a few meters. The polarity of the Earth's magnetic field has remained the same since the formation of the Earth. Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)2 and 3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?.
Consider the following statements: There is slight flattening of the earth at the equator and slight bulging at the poles. On any given day, the position of the Earth's magnetic poles moves by a few meters. The polarity of the Earth's magnetic field has remained the same since the formation of the Earth. Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)2 and 3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements: There is slight flattening of the earth at the equator and slight bulging at the poles. On any given day, the position of the Earth's magnetic poles moves by a few meters. The polarity of the Earth's magnetic field has remained the same since the formation of the Earth. Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)2 and 3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements: There is slight flattening of the earth at the equator and slight bulging at the poles. On any given day, the position of the Earth's magnetic poles moves by a few meters. The polarity of the Earth's magnetic field has remained the same since the formation of the Earth. Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)2 and 3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?.
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