Random errors occur due to:
  • fluctuations in temperature, supply,error in reading
  • incorrect rounding off
  • imperfect design of instruments
  • parallax
In the formula where b is the arc length and D is the radius,θ is measured in:
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  • minutes
  • degrees
  • radians
  • seconds
1 fermi is equal to:
  • 10-10 m
  • 1010 m
  • 1015 m
  • 10-15 m
Approximate ratio of 1 fermi to 1 angstrom is ..............
  • 10-5m correct
  • 10-15 m
  • 10-9 m
  • 10-6 m
The error in two readings of A are 0.01 and -0.03, then mean absolute error is ?
  • 0.002
  • - 0.004
  • 0.02
  • - 0.02
One angstrom is equal to __________ .
  • 10-9 m
  • 10-11 m
  • 10-12 m
  • 10-10 m
Angstrom is the unit of
  • Time
  • Mass
  • Light
  • Length
Which is the most accurate atomic clock?
  • Carbon-12 clock
  • Carbon atom clock
  • Caesium atom clock
  • Stop clock
The method used to measure the distance of a planet from the earth is
  • Parallax method
  • Archimedes' method
  • Newton's method
  • Galileo's method
The most suitable instrument for measuring the size of an atom is.
  • Electron microscope
  • Vernier calliper
  • Optical Microscope
  • Screw gauge
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