GATE-2018 (24) :Wyllie – Time average equation

CSIR-NET

54.Compared to Delhi , Earth's normal gravity field at Colombo is

A) smaller as Sri Lanka is surrounded by water

B) larger as the oceanic crust below Sri Lanka is shallower

C) larger as Sri Lanka is iso-statically compensated

D) smaller because of Colombo's geographic location

Answer: D

Explanation:

International Gravity formula

g_n = 9.78 ( 1+ 0.0053 sin²λ- 0.0000058sin² 2λ) m/s²

λ = latitude

 

Delhi latitude is approximately 28⁰ N, and Colombo latitude is approximately 6⁰ N So, using this two latitudes, if we calculate the normal gravity Delhi will give the high normal gravity compared to Colombo.