Select from the following a group of birds each member of which is able to see distinctly the object four times as far as we can see.

Which of the following instruments is used for measuring the depth of the ocean?

Which one of the following substance is used in photography and also as an antichlor ? 

Compound among the following is 

Where was Fahien from?

In 'global warming' the temperature of?

The following is true about ozone?

( A ) It is essential for respiration of animals and plants.

( B ) It absorbs ultraviolet rays.

( C ) Its percentage in air is almost 3 %.

( D ) It is used to disinfect water.

Which of the following is one of four biodiversity hot spots of India?