FREE Reading Comprehension Practice Problems for CAT

Tips on how to approach CAT Reading Comprehension passages
  • Don’t get into the minor details of the passage; just focus on what each paragraph has to say
  • As you read, create a map of the passage; you must remember what thing is located where in the passage
  • Once you read the question, come back to the part of the passage that is likely to have the answer
  • Compare the options and eliminate the incorrect choices based on the evidence that you see in the passage
  • Choose the answer once you are convinced of the right choice

online CAT coaching

Reading Comprehension Practice Passage

No very satisfactory account of the mechanism that caused the formation of the ocean basins has yet been given. The traditional view supposes that the upper mantle of the earth behaves as a liquid when it is subjected to small forces for long periods and that differences in temperature under oceans and continents are sufficient to produce convection in the mantle of the earth with rising convection currents under the mid-ocean ridges and sinking currents under the continents. Theoretically, this convection would carry the continental plates along as though they were on a conveyor belt and would provide the forces needed to produce the split that occurs along the ridge. This view may be correct: it has the advantage that the currents are driven by temperature differences that themselves depend on the position of the continents. Such a back-coupling, in which the position of the moving plate has an impact on the forces that move it, could produce complicated and varying motions.

On the other hand, the theory is implausible because convection does not normally occur along lines, and it certainly does not occur along lines broken by frequent offsets or changes in direction, as the ridge is. Also it is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean. This plate is growing on both sides, and since there is no intermediate trench, the two ridges must be moving apart. It would be odd if the rising convection currents kept exact pace with them. An alternative theory is that the sinking part of the plate, which is denser than the hotter surrounding mantle, pulls the rest of the plate after it. Again it is difficult to see how this applies to the ridge in the South Atlantic, where neither the African nor the American plate has a sinking part.

Another possibility is that the sinking plate cools the neighboring mantle and produces convection currents that move the plates. This last theory is attractive because it gives some hope of explaining the enclosed seas, such as the Sea of Japan. These seas have a typical oceanic floor, except that the floor is overlaid by several kilometers of sediment. Their floors have probably been sinking for long periods. It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins. The enclosed seas are an important feature of the earth’s surface, and seriously require explanation because, in addition to the enclosed seas that are developing at present behind island arcs, there are a number of older ones of possibly similar origin, such as the Gulf of Mexico, the Black Sea, and perhaps the North Sea.

In case you have any doubt in this RC, you can tag Brijesh Pandey on our CAT Preparation Facebook group

Question: According to the traditional view of the origin of the ocean basins, which of the following is sufficient to move the continental plates?

Increases in sedimentation on ocean floors
Spreading of ocean trenches
Movement of mid-ocean ridges
Sinking of ocean basins
Differences in temperature under oceans and continents

Question: It can be inferred from the passage that, of the following, the deepest sediments would be found in the

Indian Ocean
Black Sea
South Atlantic

Question: The author refers to a “conveyor belt” in in order to

illustrate the effects of convection in the mantle
show how temperature differences depend on the positions of the continents
demonstrate the linear nature of the Mid-Atlantic Ridge
describe the complicated motions made possible by back-coupling
account for the rising currents under certain mid-ocean ridges

Question: The author regards the traditional view of the origin of the oceans with

slight apprehension
absolute indifference
indignant anger
complete disbelief
guarded skepticism

Question: According to the passage, which of the following are separated by a plate that is growing on both sides?

The Pacific Ocean and the Sea of Japan
The South Atlantic Ridge and the North Sea Ridge
The Gulf of Mexico and the South Atlantic Ridge
The Mid-Atlantic Ridge and the Indian Ocean Ridge
The Black Sea and the Sea of Japan

Question: Which of the following, if it could be demonstrated, would most support the traditional view of ocean formation?

Convection usually occurs along lines.
The upper mantle behaves as a dense solid.
Sedimentation occurs at a constant rate.
Sinking plates cool the mantle.
Island arcs surround enclosed seas.

Question: According to the passage, the floor of the Black Sea can best be compared to a

rapidly moving conveyor belt
slowly settling foundation
rapidly expanding balloon
violently erupting volcano
slowly eroding mountain

Question: Which of the following titles would best describe the content of the passage?

A Description of the Oceans of the World
Several Theories of Ocean Basin Formation
The Traditional View of the Oceans
Convection and Ocean Currents
Temperature Differences among the Oceans of the World

Also Check: CAT Quant Challenging Questions with VIDEO Solutions
Previous PassageNext Passage

Online Reading Comprehension Course for CAT 2018

500 Reading Comprehension (RC) practice questions with video explanations in detail

100 Critical Reaoning practice questions with video explanations in detail

Covers all major category of RC : Philosophy, Humanisties, Art, Literature, Business and Economics, Science and Technology etc

Based on the latest CAT pattern

Online Support : live online sessions for concepts building and doubt clearing

How to solve CAT RC Passages
2000+ CAT Verbal Practice Problems all with Video Explanations.
click here for FREE trial
FREE Reading Comprehension Practice Problems for CAT
4.8 (95%) 16 vote[s]

What Students Say

For regular updates and FREE sessions, join our following GROUPS