Ans: (b)
128. Which one of the following statements is correct? [CDS 2010]
   (a) The angle of contact of water with glass is acute, while that of mercury
       with glass is obtuse
   (b) The angle of contact of water with glass is obtuse, while that of mercury
       with glass is acute
   (c) Both the angle of contact of water with glass and that of mercury with
       glass are acute
   (d) None of the above
Ans: (a)
129. Who was the inventor of telescope? [UPPCS (Pre) 1994]
   (a) Galileo
   (b) Gutenberg
   (c) Edison
   (d) Graham Bell
Ans: (a)
130. Who was the inventor of radar ? [BPSC (Pre) 2008]
   (a) Robert Watson
   (b) Fleming
   (c) Bush Wall
   (d) Austin
Ans: (a)
131. Human eyes are :
   (a) converging lenses of variable focal length
   (b) converging lenses of fixed focal length
   (c) diverging lenses of variable focal length
   (d) diverging lenses of fixed focal length
Ans: (a)
132. The function of heavy water in a nuclear reactor is to : [CSAT (Pre)
   2011]
   (a) slow down the speed of neutrons
   (b) increase the speed of neutrons
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