Comprehension

The compass is one of the oldest navigational tools we have. Since mankind began to understand more about navigation, compasses have been crucial to the achievement of major feats such as the first transoceanic voyages and the circumnavigation of the globe. None of this would have been possible without the aid of the compass in performing navigation calculations over long distances.
Early explorers had to use local landmarks and the stars to navigate. This made it very difficult to travel to far or unknown destinations. Compasses were one of the key breakthroughs that made such voyages possible. So how exactly does a compass work ?
A compass works by detecting and responding to the Earth’s natural magnetic fields. The Earth has an iron core that is part liquid and part solid crystal, due to gravitational pressure. It is believed that movement in the liquid outer core is what produces the Earth’s magnetic field. Like all such fields, the Earth’s magnetic field has two poles - North and South. These magnetic poles are slightly off from the Earth’s axis of rotation, which is used as the basis of the geographic poles - however the magnetic and geographic poles are close enough to allow a compass to serve as a valuable navigation tool, especially when adjustments are made for the polar differences - such adjustments being referred to as declination.
In September 2019, for the first time in over 360 years, compasses at Greenwich pointed true north. Most of the time, however, compasses don’t actually point precisely towards the North Pole.
True north is the direction that points directly towards the geographic North Pole. This is a fixed point on the Earth’s globe. Magnetic north is quite different : it is the direction that a compass needle points to as it aligns with the Earth’s magnetic field.
The magnetic North Pole shifts and changes over time in response to changes in the Earth’s magnetic core : it isn’t a fixed point.
This difference between true North and the North heading on a compass forms an angle, referred to as declination. Declination varies from place to place because the Earth’s magnetic field is not uniform - it dips and undulates.

Question: 1

Select the option that corresponds to a ‘feat’.

  • The diversion of traffic
  • A student’s tribute to the mentor
  • An acrobatic performance
  • The cancellation of a flight booking
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The Correct Option is C

Solution and Explanation

The correct option is (C): An acrobatic performance.
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Question: 2

The writer refers to the compass as a “key” breakthrough, to highlight its ______ .

  • importance
  • scientific nature
  • ease of use
  • novelty
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The Correct Option is A

Solution and Explanation

The correct option is (A): importance.
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Question: 3

Select the option that can be used, both as a noun as well as a verb, in the given form.

  • uniform, magnetic, point
  • Only uniform
  • uniform and core
  • point, iron and core
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The Correct Option is D

Solution and Explanation

The correct option is (D): point, iron and core.
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Question: 4

Identify the meaning of the adjective in the given line from the text.
‘..... compasses at Greenwich pointed true north.’

  • aimed
  • precise
  • topmost
  • sharp
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The Correct Option is B

Solution and Explanation

The correct option is (B): precise.
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Question: 5

Which action suitably corresponds with ‘undulates’ ?

  • praying
  • walking a dog
  • sharing a secret
  • dancing
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The Correct Option is D

Solution and Explanation

The correct option is (D): dancing.
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Question: 6

5 towers made by civilisation X were declared to be protected heritage building. Uniquely, four of them are placed geographically such that they are the vertices of a square. The fifth is placed at the point of intersection of the two diagonals of the square. Let the towers be named A, B, C, D and E. The following information is given to you about the five towers :
  1. C, A and B are in a straight line (in no particular order) that runs from south-east to north-west.
  2. If one looks directly east from B, no tower is visible. This is not true for A and D.
  3. If one looks directly north from D, a tower is visible.
Based on the above information, which tower is in the centre ?

  • A
  • B
  • C
  • Insufficient information
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The Correct Option is D

Solution and Explanation

The correct option is (D): Insufficient information.
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Question: 7

5 towers made by civilisation X were declared to be protected heritage building. Uniquely, four of them are placed geographically such that they are the vertices of a square. The fifth is placed at the point of intersection of the two diagonals of the square. Let the towers be named A, B, C, D and E. The following information is given to you about the five towers :
  1. C, A and B are in a straight line (in no particular order) that runs from south-east to north-west.
  2. If one looks directly east from B, no tower is visible. This is not true for A and D.
  3. If one looks directly north from D, a tower is visible.
If one seeks to travel to D from A, one has to go

  • East
  • South-east
  • West
  • South
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The Correct Option is D

Solution and Explanation

The correct option is (D): South.
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Question: 8

5 towers made by civilisation X were declared to be protected heritage building. Uniquely, four of them are placed geographically such that they are the vertices of a square. The fifth is placed at the point of intersection of the two diagonals of the square. Let the towers be named A, B, C, D and E. The following information is given to you about the five towers :
  1. C, A and B are in a straight line (in no particular order) that runs from south-east to north-west.
  2. If one looks directly east from B, no tower is visible. This is not true for A and D.
  3. If one looks directly north from D, a tower is visible.
If one seeks to travel to B from A, one has to go

  • East
  • South-east
  • West
  • Cannot be determined
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The Correct Option is B

Solution and Explanation

The correct option is (B): South-east.
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Question: 9

5 towers made by civilisation X were declared to be protected heritage building. Uniquely, four of them are placed geographically such that they are the vertices of a square. The fifth is placed at the point of intersection of the two diagonals of the square. Let the towers be named A, B, C, D and E. The following information is given to you about the five towers :
  1. C, A and B are in a straight line (in no particular order) that runs from south-east to north-west.
  2. If one looks directly east from B, no tower is visible. This is not true for A and D.
  3. If one looks directly north from D, a tower is visible.
At sunset, A’s shadow points ______ .

  • Towards B
  • Towards C
  • Towards D
  • Towards E
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The Correct Option is D

Solution and Explanation

The correct option is (D): Towards E.
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Question: 10

A compass (circular in shape) consists of two parts : a magnetic needle that points towards the magnetic north, and a circular piece of paper with directions written on it. If, somehow, the piece of paper rotates a quarter-circle counter-clockwise, which geographic direction does needle point towards ?

  • Approximately east
  • Exactly east
  • Approximately west
  • Exactly west
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The Correct Option is A

Solution and Explanation

The correct option is (A): Approximately east.
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Question: 11

A is holding a compass at the time of sunrise. He points it towards the direction of the sunrise and sees that it reads “SW”. This means that the compass has rotated ______ .

  • 135 degrees counter-clockwise or 225 degrees clockwise
  • 135 degrees clockwise or 225 degrees counter-clockwise
  • 45 degrees clockwise or 315 degrees counter-clockwise
  • 45 degrees counter-clockwise or 315 degrees clockwise
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The Correct Option is B

Solution and Explanation

The correct option is (B): 135 degrees clockwise or 225 degrees counter-clockwise.
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Question: 12

In the facts of the question above, what actual direction is “NW” on the compass pointing towards ?

  • North
  • South
  • East
  • West
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The Correct Option is B

Solution and Explanation

The correct option is (B): South.
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