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UPSC Civil ServicesPrelims2023General Studies Paper I
Question
QQ65. 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?
Options
- A 1 only
- B 2 only
- C Both 1 and 2
- D Neither 1 nor 2
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Correct Answer
C Both 1 and 2
Model Answer
Answer: option C, as per UPSC's final answer key (Series A).