1. Which of the following statements about the Amazon Rainforest are correct?
- The majority of the Amazon Rainforest is contained within Brazil.
- The Amazon Rainforest is shared only by Brazil, Colombia, and Peru.
- Amazon Rainforest accounts for almost half of Earth's total rainforests.
Select the correct option from the codes given below:
[A] Only 1 & 2
[B] Only 2 & 3
[C] Only 3
[D] Only 1 & 3
Show Answer
Correct Answer: D [Only 1 & 3]
Notes:
The Amazon Rainforest is mainly in Brazil (about 60%), and accounts for nearly half of Earth's total rainforests. However, it is shared by nine countries (not just Brazil, Colombia, and Peru), including Venezuela, Ecuador, Bolivia, Guyana, Suriname, and French Guiana. Thus, statements 1 and 3 are correct, while statement 2 is incorrect.
2. With reference to plate tectonics, Subduction:
- occurs when denser ocean crusts slide beneath lighter continental crusts
- causes the formation of deep ocean trenches
- is responsible for high occurrences of volcanoes and earthquakes in some areas
- helps in mountain formation
Which among the above statements is / are correct?
[A] Only 1 & 2
[B] Only 1, 2 & 3
[C] Only 2, 3 & 4
[D] 1, 2, 3 & 4
Show Answer
Correct Answer: D [ 1, 2, 3 & 4]
Notes:
All four statements are correct. Subduction zones occur where oceanic crust subducts beneath continental crust, forming deep ocean trenches and generating frequent earthquakes and volcanic activity. Subduction contributes to mountain building due to uplift from converging plates, as seen in ranges like the Andes and the Himalayas.
3. Consider the following:
- Pressure Gradient
- Temperature Gradient
- Ge-magnetism
- Coriolis Effect
Which of the above factors influence the intensity or the velocity of winds?
[A] Only 1 & 2
[B] Only 2 & 3
[C] Only 1, 3 & 4
[D] Only 1, 2 & 4
Show Answer
Correct Answer: D [Only 1, 2 & 4]
Notes:
Pressure gradient, temperature gradient, and Coriolis effect all impact wind velocity or intensity. The pressure and temperature gradients create air movement, while the Coriolis effect modifies its direction. Geomagnetism does not have any direct influence on wind intensity or velocity. Hence, statements 1, 2, and 4 are correct.
4. We always see the same face of the Moon from Earth. Which of the following statements explain this phenomenon?
- The Moon revolves around the Earth and rotates on its axis in exactly the same amount of time.
- Tidal forces have locked the visible face of the Moon towards Earth.
Select the correct option from the codes given below:
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [Both 1 & 2]
Notes:
Both statements are correct. The Moon’s rotation period is synchronized with its revolution around the Earth, resulting in the same face always pointing towards us. This synchronous rotation is caused by tidal locking—gravitational interactions and resulting friction between the Earth and Moon over time, which slowed the Moon’s rotation to match its orbital period.
5. Which of the following processes can convert an igneous rock into a sedimentary rock?
- Weathering and Erosion
- Melting
- Heating and Pressure
Select the correct option from the codes given below:
[A] Only 1
[B] 1 & 2
[C] 1, 2 & 3
[D] 1 & 3
Show Answer
Correct Answer: A [Only 1]
Notes:
Weathering and erosion break down igneous rocks into smaller sediments, which are transported, deposited, and compacted to form sedimentary rocks. Melting turns rocks into magma, and heating and pressure form metamorphic rocks. Only weathering and erosion directly lead to the transformation of igneous rocks into sedimentary rocks; the other processes result in different rock types.
6. Which of the following statements explain why Mars is unable to sustain life?
- Mars has no magnetosphere
- The atmosphere of Mars is very thin
- Mars is well beyond the habitable zone of the solar system
- Mars has no water, water ice and oxygen
Select the correct option from the codes given below:
[A] Only 1 & 2
[B] Only 1, 2 & 3
[C] Only 2, 3 & 4
[D] Only 1 & 3
Show Answer
Correct Answer: A [Only 1 & 2]
Notes:
Statements 1 and 2 are correct. Mars lacks a magnetosphere and has a very thin atmosphere, both of which hinder its ability to sustain life. Mars is near the edge of the habitable zone and has water ice and traces of oxygen; hence, statements 3 and 4 are incorrect. These factors collectively limit Mars’s capacity for life.
7. Consider the following statements regarding subduction:
- Subduction occurs when denser oceanic crust slides beneath lighter continental crust.
- Subduction causes the formation of deep ocean trenches.
- Subduction is responsible for high occurrences of volcanoes and earthquakes in certain regions.
Which of the above statements is / are correct?
[A] Only 1 and 2
[B] Only 2 and 3
[C] Only 1 and 3
[D] 1, 2 and 3
Show Answer
Correct Answer: D [1, 2 and 3]
Notes:
All three statements are correct. Subduction involves denser oceanic crust descending beneath lighter continental or oceanic crust, leading to the formation of deep ocean trenches. Subduction zones are characterized by frequent volcanic activity and earthquakes due to intense tectonic interactions in these regions.
8. With reference to the Ocean Currents in Indian Ocean consider the following statements:
- Indian Ocean is known for one of the most consistent system of Ocean Currents
- The currents in the northern Indian Ocean change their flow direction twice a year
Which among the above statements is / are correct?
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: B [Only 2]
Notes:
The current systems of the Indian Ocean are largely controlled and modified by landmasses and monsoon winds. Indian Ocean being surrounded by the Indian subcontinent, Africa and Australia does not present most favourable conditions for the development of consistent system of ocean currents. The currents in the northern Indian Ocean change their flow direction twice a year due to north-east and south-west monsoon winds.
9. Which of the following statements are correct?
- In the temperate zones of the Northern Hemisphere, the eastern edges of continents tend to be warmer than the western edges.
- Coastal deserts are generally found on the west side of continents.
- Most of the great deserts lie between 40° and 60° north or south latitude.
Select the correct option from the codes given below:
[A] Only 1 & 2
[B] Only 2
[C] Only 2 & 3
[D] 1, 2 & 3
Show Answer
Correct Answer: B [Only 2]
Notes:
Statement 1 is incorrect; western coasts in temperate zones are generally warmer due to warm ocean currents. Statement 2 is correct; major coastal deserts, such as the Atacama and Namib, are found on west coasts. Statement 3 is incorrect; most great deserts are located between 20° and 30° latitude, not between 40° and 60°.
10. Which of the following is the correct order for elements/minerals found in the earth crust?
[A] Silicon>Oxygen>Iron>Aluminium
[B] Oxygen>Aluminium>Iron>Silicon
[C] Iron>Silicon>Aluminium>Oxygen
[D] Oxygen>Silicon>Aluminium>Iron
Show Answer
Correct Answer: D [ Oxygen>Silicon>Aluminium>Iron]
Notes:
Major elements in Earth’s crust are Oxygen (47%), Silicon (28%), Aluminium (8%), Iron (5%), Calcium (3.5%), Sodium (2.5%), Potassium (2.5%) & Magnesium (2.2%)
