Lock, Shut, Fasten

All the cities given in the question are state capitals similarly Shimla is also a capital.

Apple, Grape and Orange all these are fruits.

As Arc is a part of Circle similarly segment is a part of line.

As River joints to Ocean similarly Lane joints to Road.

First is the boundary of the second.

All the terms given in the question are cereals and gram is also one of the cereals.

As all terms given in the question are medical terms and Hematology is also medical term.

All these are planets.

As Lungs, Liver and Kidney are internal part of the body, in the same way 'heart' is also an internal organ.

These are all the languages of computer.