Science General knowledge Questions

29. The two elements that are frequently used for making transistors are
  A.  Silicon and germanium
  B.  Boron and aluminium
  C.  Iridium and tungsten
  D.  Niobium and columbium
Answer
Ans: A
Silicon and germanium
30. The inner back surface of the eye is called
  A.  Retina
  B.  Choroid
  C.  Cornea
  D.  Pupil
Answer
Ans: A
Retina
31. The variety of coal in which the deposit contains recognisable traces of the original plant material is
  A.  Lignite
  B.  Peat
  C.  Anthracite
  D.  Bitumen
Answer
Ans: B
Peat
32. Galvanised iron sheets have a coating of
  A.  Zinc
  B.  Chromium
  C.  Tin
  D.  Lead
Answer
Ans: A
Zinc
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