Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?

A body is thrown upward against the gravity ‘g’ with initial velocity ‘u’. Which one among the following is the correct expression for its final velocity when the body attains the maximum height?

 If the ratio of the weight of a man in a stationary lift and when it is moving downwards with uniform acceleration ‘a’ is 3 : 2, then the value of ‘a’ is

The current produced by upwelling of cold water off the coast of Chile and Peru is known as

A one-rupee coin is placed at the bottom of a vessel. Water is then poured into the vessel such that the depth of water becomes 20 cm. If water has refractive index 4/3, the coin would be seen at a depth of

The spread in colours in a rainbow on sky is primarily due to