Q: 51 (CDS-II/2012)
question_subject:
Science
question_exam:
CDS-II
stats:
0,17,46,27,17,8,11
keywords:
{'primary waves': [0, 0, 0, 2], 'secondary waves': [0, 0, 0, 1], 'waves': [0, 0, 3, 0], 'surface waves': [0, 0, 0, 1], 'longitudinal waves': [0, 0, 0, 1], 'internal structure': [0, 0, 1, 2], 'earth': [0, 1, 1, 1], 'scientists': [2, 2, 8, 11]}
the correct answer would be either option 1 (primary waves) or option 2 (secondary waves), as these are the two types of seismic waves that travel through the Earth's interior and can be used to study its structure.