Atleast 2 scenarios in which we use mipmaps??

You’re question wasn’t quite clear because it’s a sentence fragment with no context. Who is we, what scenarios are you envisioning, and are you asking for a list?

If your question is basically “what is MIPmapping for” or “why MIPmapping is needed?”, a websearch on that will turn up plenty of hits, including posts from these forums such as:

and this section from the OpenGL wiki:

For textures that do not change over time, I use mipmaps every single time. Scaling (minification) looks much better.

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