Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q38 (CAPF/2021) Geography › World Physical Geography › Atmospheric pressure winds Answer Verified

The speed of the wind is measured by

Result
Your answer: —  Â·  Correct: D
Explanation

The speed of the wind is measured using an anemometer [4]. This meteorological instrument typically consists of three or four metal cups mounted on a vertical spindle that rotate when the wind blows [1]. The rate of rotation is proportional to the wind speed, which is then calculated in units such as kilometers per hour (km/h) or knots [5]. While an anemometer measures velocity, a wind vane (or weather vane) is used specifically to determine wind direction [5]. Other instruments mentioned serve different purposes: a barometer measures atmospheric pressure rather than speed, and a wind rose is a graphical tool used by meteorologists to show how wind speed and direction are typically distributed at a particular location over time. Modern variations include sonic and hot-wire anemometers for specialized environmental conditions [6].

Sources

  1. [1] Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025) > Chapter 2: Understanding the Weather > THINK ABOUT IT > p. 37
  2. [3] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 13: Weather > Notes > p. 121
  3. [4] Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025) > Chapter 2: Understanding the Weather > THINK ABOUT IT > p. 36
  4. [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 13: Weather > Fig. 13.13 A wind rose > p. 122
  5. [6] https://education.nationalgeographic.org/resource/anemometer/
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
58%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

NDA-I · 2009 · Q34 Relevance score: 0.16

Which one of the following instruments is used for measuring the humidity of the air?

CDS-II · 2010 · Q105 Relevance score: -2.94

. Which one of the following is the correct sequence of increasing velocity of wind ?

CAPF · 2011 · Q7 Relevance score: -3.04

Which one among the following forces is most powerful in determining movement of wind including its velocity ?

NDA-I · 2010 · Q6 Relevance score: -3.38

Statement I : Pressure gradients determine the velocity of winds. Statement II : When isobars (lines of equal atmospheric pressure) are closely spaced, the wi nd velocity would be gentle.

NDA-II · 2025 · Q117 Relevance score: -3.57

Consider the following statements with reference to sea waves : 1. The height of waves is determined by wind speed, wind duration, and fetch 2. The energy of a wave is proportional to the square of its height 3. Waves retain most of their energy as they travel across the deep ocean Which of the statements given above is/are correct ?