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Question 1 of 5
1. Question
Lithospheric plates move around very slowly – just a few millimetres each year. This is because of
Correct
Solution: d)
The lithosphere is broken into a number of plates known as the Lithospheric plates. You will be surprised to know that these plates move around very slowly – just a few millimetres each year. This is because of the movement of the molten magma inside the earth.
Incorrect
Solution: d)
The lithosphere is broken into a number of plates known as the Lithospheric plates. You will be surprised to know that these plates move around very slowly – just a few millimetres each year. This is because of the movement of the molten magma inside the earth.
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Question 2 of 5
2. Question
Consider the following statements.
- The rocks equidistant on either side of the crest of mid-oceanic ridges show remarkable similarities in terms of period of formation, chemical compositions and magnetic properties.
- The age of the oceanic rocks decrease as one move away from the crest of mid-oceanic ridge.
Which of the above statements is/are incorrect?
Correct
Solution: b)
The rocks equidistant on either sides of the crest of mid-oceanic ridges show remarkable similarities in terms of period of formation, chemical compositions and magnetic properties. Rocks closer to the mid-oceanic ridges have normal polarity and are the youngest. The age of the rocks increases as one moves away from the crest.
Incorrect
Solution: b)
The rocks equidistant on either sides of the crest of mid-oceanic ridges show remarkable similarities in terms of period of formation, chemical compositions and magnetic properties. Rocks closer to the mid-oceanic ridges have normal polarity and are the youngest. The age of the rocks increases as one moves away from the crest.
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Question 3 of 5
3. Question
The earth movements are divided on the basis of the forces which cause them. Which of the following are considered as endogenic forces?
- Glaciers
- Sea-waves
- Landslides
- Diastrophic forces
Select the correct answer code:
Correct
Solution: b)
The earth movements are divided on the basis of the forces which cause them. The forces which act in the interior of the earth are called as Endogenic forces and the forces that work on the surface of the earth are called as Exogenic forces.
Incorrect
Solution: b)
The earth movements are divided on the basis of the forces which cause them. The forces which act in the interior of the earth are called as Endogenic forces and the forces that work on the surface of the earth are called as Exogenic forces.
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Question 4 of 5
4. Question
Which of the following evidences supported the continental drift?
- Jig-Saw-Fit of shorelines of Africa and South America
- Rocks of Same Age Across the Oceans
- Tillite deposits
- Placer Deposits
How many of the above options is/are correct?
Correct
Solution: d)
Evidence in Support of the Continental Drift
- The Matching of Continents (Jig-Saw-Fit): The shorelines of Africa and South America facing each other have a remarkable and unmistakable match.
- Rocks of Same Age Across the Oceans: The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa.
- Tillite: It is the sedimentary rock formed out of deposits of glaciers. The Gondawana system of sediments from India is known to have its counter parts in six different landmasses of the Southern Hemisphere. Overall resemblance of the Gondawana type sediments clearly demonstrates that these landmasses had remarkably similar histories.
Placer Deposits: The occurrence of rich placer deposits of gold in the Ghana coast and the absolute absence of source rock in the region is an amazing fact. The gold bearing veins are in Brazil and it is obvious that the gold deposits of the Ghana are derived from the Brazil plateau when the two continents lay side by side.
Incorrect
Solution: d)
Evidence in Support of the Continental Drift
- The Matching of Continents (Jig-Saw-Fit): The shorelines of Africa and South America facing each other have a remarkable and unmistakable match.
- Rocks of Same Age Across the Oceans: The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa.
- Tillite: It is the sedimentary rock formed out of deposits of glaciers. The Gondawana system of sediments from India is known to have its counter parts in six different landmasses of the Southern Hemisphere. Overall resemblance of the Gondawana type sediments clearly demonstrates that these landmasses had remarkably similar histories.
Placer Deposits: The occurrence of rich placer deposits of gold in the Ghana coast and the absolute absence of source rock in the region is an amazing fact. The gold bearing veins are in Brazil and it is obvious that the gold deposits of the Ghana are derived from the Brazil plateau when the two continents lay side by side.
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Question 5 of 5
5. Question
Which of the following elements makes the highest share in the Earth’s crust by weight?
Correct
Solution: c)
The Major Elements of the Earth’s Crust:
Elements By Weight(%)
- Oxygen 46.60
- Silicon 27.72
- Aluminum 8.13
- Iron 5.00
- Calcium 3.63
- Sodium 2.83
- Potassium 2.59
- Magnesium 2.09
- Others 1.41
Incorrect
Solution: c)
The Major Elements of the Earth’s Crust:
Elements By Weight(%)
- Oxygen 46.60
- Silicon 27.72
- Aluminum 8.13
- Iron 5.00
- Calcium 3.63
- Sodium 2.83
- Potassium 2.59
- Magnesium 2.09
- Others 1.41
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