The brightness of a star depends on its

The 'Amarkantak Hills' is the source of which of the following rivers?

1. Narmada 2. Mahanadi 3. Tapti 4. Son

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Which of the following statements in the context of Northern hemisphere is/are correct?

1. Vernal equinox occurs on 21st March.

2. Summer solstice occurs on 22nd December.

3. Autumnal equinox occurs on 23rd September.

4. Winter solstice occurs on 21st June.

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In India, glacial terraces known as 'Karewas' are found in