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UPSC Prelims 2023 Paper-1 📅 28 May, 2023

Consider the following statements:
  • 1. In a seismograph, P waves are recorded earlier than S waves.
  • 2. In P waves, the individual particles vibrate to and fro in the direction of wave propagation whereas in S waves, the particles vibrate up and down at right angles to the direction of wave propagation.
Which of the statements given above is/are correct?

A
1 only
B
2 only
C
Both 1 and 2
D
Neither 1 nor 2
Result Summary
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UPSC Prelims
2023 • 28 May, 2023 • Paper-1
Consider the following statements:
  • 1. In a seismograph, P waves are recorded earlier than S waves.
  • 2. In P waves, the individual particles vibrate to and fro in the direction of wave propagation whereas in S waves, the particles vibrate up and down at right angles to the direction of wave propagation.
Which of the statements given above is/are correct?
Correct Answer
Both 1 and 2
Subject: Geography.Context: Seismic Waves.Details: Statement 1 is correct; Primary (P) waves are the fastest seismic waves and arrive first at a seismograph. St......
Ref/Book : UPSC Prelims 2023
Ref. Subject Geography
Chapter -
Ref. Topic Geomorphology
Pg. No -
💡 Analysis & Explanation
Subject ▼
Geography.
Context ▼
Seismic Waves.
Details ▼
Statement 1 is correct; Primary (P) waves are the fastest seismic waves and arrive first at a seismograph. Statement 2 is correct; P-waves are longitudinal (compressional) waves where particles vibrate parallel to the direction of propagation, while Secondary (S) waves are transverse (shear) waves where particles oscillate perpendicular to the direction of wave travel.
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