give reasons for the following that it is stock or folw concept and why...
capital
income
money
interest
savings..

Pratik, whenever you have such types of questions, use the below statements as an ultimate tool.

Stock- at a particular point of time
Flow- during a interval of time

Now, follow the below link and scroll down to the topic- Stock Variables and Flow Variables

https://www.meritnation.com/cbse/class12-commerce/studymaterial/economics/introductory-macroeconomics/national-income-accounting/341_1987_5831#slide1_difference-between-final-goods-and-intermediates-goods-stock-and-flow-variables