UPSC Geo-Scientist and Geologist Exam Papers 2019 : Geo-Physics Paper - I

(Download) UPSC: Geologist Examination Papers-2019

Exam Name : UPSC Geo-Scientist and Geologist Exam 2019

Subject : Geophysics Paper - I

Year : 2019

GEOPHYSICS
Paper-I

Time Allowed : Three Hours

Maximum Marks : 200

1.(a) How many half-lives must elapse before the activity of a radioactive isotope decreases to 2% of its initial value? How long is this time for ¹⁴ C (carbon 14 isotope), which has a decay rate of 1.21x10^-4 yr^-1?

1.(b) The moment of the recent Indonesian earthquake has been estimated to be about 1.0x1023 Nm. Assume that the fault is horizontal, where slip area is 100 km wide and 1300 km long, and the shear modulus u = 3.0x1010 N/m2, calculate the average displacement on the fault.

1.(c)Discuss about the origin of the geomagnetic field.