Question

why is difference between durations of day and night hardly felt at kenyakumari but not so in Kashmir

Answer 1

This is because of the latitudes of the two places. As the Earth's axis is tilted, sunlight reaches different parts of the Earth differently. Kanyakumari lies near the equator, so it receives sunlight equally throughout the year. It is not so in Kashmir as it lies away from  the equator.

Hope I helped. If I didn't, please inform me. I will do my best to clarify.