(A) James Watt : Vapour Engine
(B) A. G. Bell : Telephone
(C) J.L. Baird : Television
(D) J. Perkins : Penicillin
Which of the following is used as retardant in nuclear reactor?
1618 05e37bdc1ad02e21163c615d2The fibre of the electric bulb is formed.
1505 05e37bd0d72f03a106da6b1a4Indane gas is a mixture
1497 05e37bc5f72f03a106da6ae80A flat mirror has a minimum height to see a full reflection of a person.
1391 05e37bbc672f03a106da6ababNight blindness is cause by lack of which vitamin?
1238 05e2fc76edd24fe7035a67789