NDA 2026
- Exam
- NDA
- Year
- 2026
- Subject
- General Ability
- Chapter
- General Studies
NDA 2026 · General Ability · General Studies
Consider the following statements: I. In a seismograph, P waves are...
Consider the following statements:
I. In a seismograph, P waves are recorded earlier than S waves.
II. 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?
I. In a seismograph, P waves are recorded earlier than S waves.
II. 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
- AI only
- BII only
- CBoth I and II
- DNeither I nor II
Correct answer
C. Both I and II
Step-by-step solution
P waves are primary waves and travel faster than S waves. Thus, they reach the seismograph first and are recorded earlier. Statement I is correct.
P waves are longitudinal waves, meaning the particles of the medium vibrate to and fro parallel to the direction of wave propagation. S waves are transverse waves, meaning the particles vibrate perpendicular to the direction of wave propagation. Statement II is correct.
Both statements I and II are correct.
Answer: Both I and II
P waves are longitudinal waves, meaning the particles of the medium vibrate to and fro parallel to the direction of wave propagation. S waves are transverse waves, meaning the particles vibrate perpendicular to the direction of wave propagation. Statement II is correct.
Both statements I and II are correct.
Answer: Both I and II