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Total Questions : 471 | Page 4 of 48 pages
Question 31. The inner-most layer of the earth is known as
  1.    Asthenosphere
  2.    Lithosphere
  3.    Barysphere
  4.    Mesosphere
 Discuss Question
Answer: Option A. -> Asthenosphere
Answer: (a)
The inner core is the innermost physical layer of the Earth. The asthenosphere is the highly viscous, mechanically weak and ductilely-deforming region of the upper mantle of the Earth.
It lies below the lithosphere, at depths between 100 and 200 km below the surface, but perhaps extending as deep as 700 km.
Question 32. What was the period of the Dinosaurs?
  1.    Forty crore years ago
  2.    Five crore years ago
  3.    Eighty crore years ago
  4.    Eighteen crore years ago
 Discuss Question
Answer: Option B. -> Five crore years ago
Answer: (b)
Question 33. Winds blowing constantly in one direction in rocky deserts form
  1.    Yardangs
  2.    Chimneys
  3.    Demoiselles
  4.    Mushrooms rocks
 Discuss Question
Answer: Option A. -> Yardangs
Answer: (a)
In regions of rocky deserts, wind abrasion excavates the bands of softer rocks into long, narrow corridors, separating the steep-sided over-hanging ridges of hard rocks, called yardangs.
Instead of lying in horizontal strata upon one another, the hard and soft rocks of yardangs are vertical bands and are aligned in the direction of the prevailing winds.
Question 34. Which of the following range of mountains is not the result of Tertiary orogeny?
  1.    Alps
  2.    Kunlun
  3.    Andes
  4.    Applachians
 Discuss Question
Answer: Option D. -> Applachians
Answer: (d)
Question 35. Which one of the following definition is correct?

  1. Block mountains: These are originated by tensile forces leading to the formation of rift valleys. They are also called as Horst Mountains.

  2. Dome mountains: These are formed due to the accumulation of volcanic materials. Different types of volcanic cones (e. g. cinder cones, composite cones, basic lava cones, etc.) come under this category

  3. Mountains of Accumulations: These are originated from magmatic intrusions and up warping of the crustal surface. Examples are Normal domes, lava domes, batholithic domes, laccolithic domes, salt domes.


Select the correct answer using the codes given below:
  1.    1 and 3
  2.    1 only
  3.    1, 2 and 3
  4.    2 and 3
 Discuss Question
Answer: Option B. -> 1 only
Answer: (b)
Block mountains:These are originated by tensile forces leading to the formation of rift valleys. They are also called as horst mountains. Dome mountains: These are originated by magmatic intrusions and upwarping of the crustal surface. Examples are: Normal domes, lava domes, batholithic domes, laccolithic domes, salt domes.Mountains of Accumulations:These are formed due to accumulation of volcanic materials. Different types of volcanic cones (e. g. cinder cones, composite cones, basic lava cones, etc.) come under this category.
Question 36. Consider the following statements:

  1. The large supercontinent that existed 200 million years ago when all of the continents were together was called Pangaea.

  2. Mount St. Helen’s a part of the Cascade Range of volcanoes, result from the subduction of the Juan de Fuca plate.

  3. The Andes Mountains of South America are a result of divergent plate boundary.


Select the correct statement/statements using the codes given below:
  1.    1, 2 and 3
  2.    1 and 2
  3.    None
  4.    2 only
 Discuss Question
Answer: Option B. -> 1 and 2
Answer: (b)
The Andes Mountains of South America are a result of a convergent plate boundary, also known as a destructive plate boundary.
It is an actively deforming region where two tectonic plates or fragments of the lithosphere move toward one another and collide.
Question 37. Which of the following are active volcanoes?
  1. Aconcagua
  2. Etna
  3. Kilimanjaro
  4. Vesuvius
Select the correct answer from the code given below.
  1.    2 and 3
  2.    1 and 2
  3.    2 and 4
  4.    1 and 3
 Discuss Question
Answer: Option C. -> 2 and 4
Answer: (c)
Question 38. Which one of the following types of erosion is responsible for the formation of Chambal Ravines ?
  1.    Rill
  2.    Splash
  3.    Gully
  4.    Sheet
 Discuss Question
Answer: Option C. -> Gully
Answer: (c)Chambal ravine formation significantly increases soil loss from agricultural lands and severely impacts agricultural productivity. A review of ephemeral gully erosion and spreading rates of the ravenous tracks of Lower Chambal Valley using geospatial tools shows that both the ravenous and the marginal lands have increased during the last 15 years.
Question 39. Consider the following statements.
  1. Tropical deserts in the world are found in the trade wind bands of Western ends of Continents.
  2. In India, Eastern Himalayan region receives more rain from North-Eastern winds.
Which among the above statements is/are correct?
  1.    Both 1 and 2
  2.    Only 1
  3.    Neither 1 nor 2
  4.    Only 2
 Discuss Question
Answer: Option B. -> Only 1
Answer: (b)
Question 40. Which of the following statements is correct ?
  1.    Magma has gas while lava has no gas
  2.    Lava and magma both have gas
  3.    Lava has gas while magma has no gas
  4.    Neither the lava nor the magma has gas
 Discuss Question
Answer: Option B. -> Lava and magma both have gas
Answer: (b)Highly viscous lava tends to entrap gas, which forms vesicles (bubbles) within the rock as they rise to the surface. Lava with low viscosity tends to easily release bubbling gases as they are formed.Lavas also may contain many other components, sometimes including solid crystals of various minerals, fragments of exotic rocks known as xenoliths and fragments of previously solidified lava. Volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and dissolved gas) expelled onto the Earth’s surface.At depth in the Earth, nearly all magmas contain gas dissolved in the liquid, but the gas forms a separate vapour phase when pressure is decreased as magma rises toward the surface of the Earth. This is similar to carbonated beverages which are bottled at high pressure. The high pressure keeps the gas in the solution in the liquid. Gas gives magmas their explosive character because the volume of gas expands as pressure is reduced.

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