Which scientist does not belong to Germany?
  • Hertz
  • Werner Heisenberg
  • Roentgen
  • Niels Bohr
Who discovered radioactivity?
  • Einstein
  • Becquerel
  • Newton
  • C.V. Raman
Which is the strongest fundamental force of nature?
  • Gravitational force
  • Weak nuclear force
  • Strong nuclear force
  • Electromagnetic force
Which force operates among the heavier elementary particles?
  • Strong nuclear force
  • Electromagnetic force
  • Gravitational force
  • Weak nuclear force
Electromagnetic force is stronger than gravitational force by a factor of
  • 1010
  • 1036
  • 103
  • 100
Who discovered the ultra short radio waves?
  • James Clerk Maxwell
  • J.C. Bose
  • J.J. Thomson
  • Marie Curie
The wave nature of electrons is used in which of the following devices?
  • Photocell
  • Electron microscope
  • Tokamak
  • Aeroplane
The phenomenon of Photoelectric effect is used in
  • Photocell
  • Sonar
  • Electron microscope
  • Optical fibres
According to Einstein's theory, mass and energy are related as
  • E = m/c
  • E = mc2
  • E = m c
  • E = m/c2
On which laws is the principle of rocket propulsion based?
  • Newton's first law of motion
  • Newton's law of gravitation
  • Laws of thermodynamics
  • Newton's second and third laws of motion
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