Hello Varsha

You can opt for geophysics in your Post graduation. To apply for geophyics in your pg you need to be a graduate in B.Sc. in Physics along with either subject of Chemistry or maths or Geology or Electronic Science with minimum 60% or more. To get admission in reputed colleegs you can apply for Merit and Entrance Based ways , Ex: for BHU you will have an entrance test and will get admission based upon your merit rank.