Vacuum tubes have been replaced by: (CSS 2013)
(a) Conductors
(b) Diodes
(c) Transistors
(d) None of these
Answer: (c)
Arthur C Clark the famous science fiction author while working as a radio operator in the World War –II (CSS 2012)
(a) Proposed building a space elevator from carbon mono filaments
(b) Postulated the existence of extra terrestrial artifacts on the moon
(c) Proposed that a network of satellite in stationary orbit at very high altitudes around the earth be used to bounce communication signals all over the world
(d) None of these
Answer: (c)
Photography works by (CSS 2012)
(a) Capturing the souls of the objects being photographed
(b) Capturing light reflected from the object being photographed
(c) Both A &B
(d) None of these
Answer: (c)