Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ruby negi
question is easy .. weight is mg and u know mass never change,it is a standard unit... so here g change as g change weight will also change.. u know the formula of g i.e GM/r^2 where M is the mass of planet.. find the g at two different given places and compare both by dividing ... hope u will get..