Which one of the following is a condition of delayed blood clotting? 

X - rays region lies between 

Which electromagnetic radiation is used for satellite communication? 

Solar cells work on the principle of 

Which part of the nervous system controls the activities of internal organs? 

Materials for rain-proof coats and tents owe their water proof properties to 

In the human body, fats are stored in the 

An element that does not occur in nature but can be produced artificially is