KVPY 2020-21 SA Exam Previous Papers

Question : 20 of 80

Marks: +1, -0

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,

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

Go to Question:

Prev Question

Next Question