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Q58 (NDA-I/2023) Geography › World Physical Geography Official Key

Which of the following statements is/are correct ? 1. Hypocenter is the point on the surface of the Earth, nearest to the focus. 2. Velocity of earthquake waves is higher in denser materials. 3. P waves move faster and are the first to arrive at the surface of the Earth. Select the correct answer using the code given below :

Result
Your answer: —  Â·  Correct: B
Explanation

The correct answer is Option B (2 and 3) based on the following geographical principles:

  • Statement 1 is incorrect: The hypocenter (or focus) is the actual point within the Earth where the earthquake originates. The point on the Earth's surface directly above the hypocenter is called the epicenter.
  • Statement 2 is correct: The velocity of seismic waves is directly proportional to the density and elasticity of the medium. As waves travel deeper into the Earth's interior where materials are denser, their velocity generally increases.
  • Statement 3 is correct: P-waves (Primary waves) are longitudinal waves that travel faster than S-waves and surface waves. Because of their high speed, they are the first seismic waves to reach the surface and be recorded by seismographs.
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SIMILAR QUESTIONS

NDA-I · 2024 · Q109 Relevance score: 3.35

Which of the following statements regarding earthquakes is/are correct ? 1. The point on the Earth's surface directly above the focus is called the epicentre of the earthquake. 2. Earthquakes generate Primary and Secondary waves that radiate outward from the earthquake focus. 3. Deep-focus earthquakes are likely to cause more damage than shallow-focus earthquakes. Select the answer using the code given below :

CDS-II · 2016 · Q14 Relevance score: 2.46

With reference to earthquakes, which of the following statements are correct? 1. Earthquakes largely occur along the converging plate boundaries. 2. Point of origin of earthquake in lithosphere is known as focus/ hypocentre. 3. Intensity of earthquake decreases with distance from the epicentre. 4. Epicentre of earthquake always remains over continents only. Select the correct answer using the code given below.

CDS-I · 2016 · Q28 Relevance score: 2.04

Which of the following statements is / are correct ? 1. The earth is nearest to the Sun at Perihelion, which generally occurs on January 3 2. The earth is farthest away from the Sun at Perihelion, which generally occurs on July 4 3. The earth is farthest away from the Sun at Aphelion, which generally occurs on July 4 4. The earth is nearest to the Sun at Aphelion, which generally occurs on January 3 Select the correct answer using the code given below :

NDA-II · 2013 · Q63 Relevance score: 1.99

Which of the following statements is/are correct? 1. Air close to the Earth’s surface heavier. 2. Air close to the Earth’s surface contains larger quantity of water vapoor and dust particles Select the correct answer using the code given below :

CDS-I · 2014 · Q93 Relevance score: 1.84

Which of the following statements relating to earthquakes is/are correct? 1. The point of origin of an earthquake is called the epicenter. 2. The lines joining the places which were affected by earthquake at the same point of time are called homoseismal lines. Select the correct answer using the code given below.