“Atomic theory of Matter” was given by

When a wave is intercepted by an article, the rays bend round the obstacle particle. The phenomenon is known as-

Which electromagnetic radiation is used for satellite communication? 

The first Indian communication satellite was-

Which of the following holds the Seking DNA? 

Which of the following pairs is not matched?
(A) James Watt : Vapour Engine
(B) A. G.  Bell : Telephone
(C) J.L. Baird : Television
(D) J. Perkins : Penicillin

Atomic weight of an element is compared with which of the following to get the atomic weight of that element?