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Q120 (CISF/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology)

In fieldcraft, distance is underestimated when
1. the light is bright
2. the object is large in relation to its surroundings
3. there is compressed/low-lying ground between the observer and the object
4. looking uphill
Select the correct answer using the code given below.

Result
Your answer: —  ·  Correct: A

Explanation

In fieldcraft and military training (such as NCC), judging distance accurately is a key skill. Distance is underestimated (the object appears closer than it actually is) under the following conditions:

  • Bright light: When the light is bright or the sun is behind the observer, objects appear clearer and closer.
  • Large objects: An object that is large in relation to its surroundings is often perceived as being nearer.
  • Dead ground: When there is compressed or low-lying ground (intervening ground that is not visible) between the observer and the object, the eye skips this distance, leading to underestimation.
  • Looking downhill: Looking down from a height makes objects appear closer.

In contrast, distance is overestimated (the object appears further away) when looking uphill, in poor light, or when the object is small. Since statement 4 refers to looking uphill, it is a factor for overestimation, not underestimation.

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