Are the constituencies reserved for SCs and STs evenly spread all over the entire country or are there more in some areas?

By what mechanism does scent spread all over the room if the lid is opened ?

To fill up 12 vacancies, there are 25 candidates of which 5 are from SC. If 3 of these vacancies are reserved for SC candidates while the remaining are open to all then the number of ways in which the selection can be made is

The dimensions of a field are 15 m by 12 m. A pit 8 m long, 2-5 m wide and 2 m deep is dug in one corner of the field and the earth removed is evenly spread over the remaining area of the field. The level of the field is raised by

A rectangular field has length 28 metre and width 22 metre. A 10 metre deep well of diameter 7 metres is dug in the centre of the field and the earth dug out of the well is evenly spread over the remaining part of the field what is the rise in the level of the field ? (in metre)