KVPY Government Jobs Exams

A girl standing at point P on a beach wishes to reach a point Q in the sea as quickly as possible. She can run at 6 km h1 on the beach and swim at 4 km h1 in the sea. She should take the path

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KVPY Other Question

We sit in the room with windows open. Then
(A) air pressure on the floor of the room equals the atmospheric pressure but the air pressure on the ceiling is
negligible
(B) air pressure is nearly the same on the floor, the walls and the ceiling
(C) air pressure on the floor equals the weight of the air column inside the room (from floor to ceiling) per
unit area
(D) air pressure on the walls is zero since the weight of air acts downward Light enters an isosceles right triangular prism at normal incidence through face AB and undergoes total internal reflection at face BC as shown below

The minimum value of the refractive index of the prism is close to