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KVPY 2020-21 SA Exam Previous Papers
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© examsnet.com
Question : 20
Total: 80
The earth’s magnetic field was flipped by 180° a million years ago. This flip was relatively rapid and took
10
5
years. Then the average change in orientation per year during the flip was closest to,
1 second
5 seconds
10 seconds
30 seconds
Validate
Solution:
180
°
flip taken place in a time of
10
5
years.
So in 1 year, flip
=
180
°
10
5
=
180
×
60
×
60
10
5
=
6.48
second
Closest option is 5 second
© examsnet.com
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