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Physics

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26. Einstein got the Nobel Prize for his theory of
 
  • A. radio activity
  • B. relativity
  • C. polarisation
  • D. photo electric effect
 
27. Television was discoved by
 
  • A. Bohr
  • B. J.L.Baird
  • C. Becquerrel
  • D. H.J.Bhaba
 
 
28. An artificial satellite can be tracked very precisely from the earth by using
 
  • A. sonar
  • B. radar
  • C. zeeman effect
  • D. doppler effect
 
29. Solar cells are made up of
 
  • A. germanium
  • B. helium
  • C. both silicon and germanium
  • D. silicon
 
30. The colour of star is an indication of its
 
  • A. weight
  • B. size
  • C. temperature
  • D. distance from the earth