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The speed of light will be minimum while passing through

The colour of a star is an indication of its

A corked bottle full of water when frozen will break because

The half-life of a radio active element is 5 years. The fraction of the radioactive substance that remains after 20 years is

Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure ?

If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original volume ?

One mole of hydrogen gas burns in excess of oxygen to give 290 kJ of heat. What is the amount of heat produced when 4g of hydrogen gas is burnt under the same conditions ?

In an electronic watch, the component corresponding to pendulum of a pendulum clock is a

A man jumped at a speed of 5 metres per second from a stationary boat and the boat moved off with the speed of 0.5 metre per second. How many times is the mass of the boat greater than that of the man ?

Consider the figure of a fountain with four holes given below : Which one of the holes in the fountain will throw the water farthest ?