B.Ed (CHANDIGARH) 2018 Entrance Exam With Answers

Practice Mode:
113.

Read the paragraph and choose the correct option to answer the questions on the basis of your reading:


An earthquake comes like a thief in the night, without warning. It was necessary, therefore to invent instruments that neither slumbered nor slept. Some devices were quite simple. One, for instance, consisted of rods of various lengths and thicknesses which would stand up on end like ninepins. When a shock came it shook the rigid table upon which these stood. If it were gentle, only the more unstable rods fell. If it were severe, they all fell. Thus, the rods by falling and by the direction in which they fell, recorded for the slumbering scientist, the strength of a shock that was too weak to waken him and the direction from which it came. But, instruments far more delicate than that were needed if any really serious advance was to be made.

The ideal to be aimed at was to devise an instrument that could record with a pen on paper the movements, of the ground or of the table, as the quake passed by. While I write my pen moves but the paper keeps still. With practice, no doubt, I could, in time, learn to write by holding the pen still while the paper moved. That sounds a silly suggestion, but that was precisely the idea adopted in some of the early instruments (seismometers) for recording earthquake waves. But when table, penholder and paper are all moving how is it possible to write legibly? The key to a solution of that problem lay in an everyday observation. Why does a person standing in a bus or train tend to fall when a sudden start is made? It is because his feet move on, but his head stays still.
Important for:

A simple device which consisted of rods that stood up on end like ninepins was replaced by a more sophisticated one because it failed
A: To measure a gentle earthquake
B: To measure a severe earthquake
C: To record the direction of the earthquake
D: To record the facts with a pen on paper

The answer is: D

Explanation

The correct answer is:

D) To record the facts with a pen on paper

Explanation: The passage explains that the simple device with rods standing up like ninepins was eventually replaced by more sophisticated instruments. The passage further states that the goal was to devise an instrument that could record the movements of the ground or table as the earthquake passed by. The passage specifically mentions the idea of recording the movements with a pen on paper. Therefore, the failure of the simple device led to the need for a more advanced instrument that could record earthquake data with greater accuracy.