(a) Bernor Bon Bron
   (b) J. Robert Opan Heemar
   (c) Adberd Taylor
   (d) Samual Cohen
Ans: (a)
224. Who developed the hydrogen bomb? [SSC 2002]
   (a) Bernor Bon Bron
   (b) J. Robert Opan Heemar
   (c) Adberd Taylor
   (d) Samual Cohen
Ans: (b)
225. Who was the inventor of electron microscope? [SSC 2004]
   (a) Nol & Ruska
   (b) Robert Koach
   (c) Leewan Hock
   (d) C.P. Swansun
Ans: (a)
226. Who was the inventor of scooter [RRB ASM/GG 2005]
   (a) Brad Shaw
   (b) Damlar
   (c) Einstein
   (d) Formich
Ans: (d)
227. Relative humidity is measured by: [UPPCS (Pre) 1996, CPO SI 2003]
   (a) Hydrometer
   (b) Hygrometer
   (c) Lactometer
   (d) Potentiometer
Ans: (b)
228. Which one of the following is used in measuring altitudes? [RRB TC/CC
   2002]
   (a) Barometer
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