DIRECTIONS : Questions based on Physics.

DIRECTIONS : Questions based on Physics.
1. Which one of the following common devices works on the basis of the principle of mutual induction?
  A.  Tubelight
  B.  Transformer (Ans-B)
  C.  Photodiode
  D.  Led
2. Dc current can be controlled by which one of the following components?
  A. Impedance
  B. Resistance(Ans-B)
  C. Capacitance
  D. Inductance
3. Mesons are found in
  A.  Alpha -rays
  B.  Laser beam
  C.  X - rays
  D.  Cosmic rays(Ans-D)
4. A moderator is used in nuclear reactors in order to
  A.  increase the no.of.neutrons
  B.  decrease the no.of.neutrons
  C.  slow down the speed of neutrons(Ans-C)
  D.  Anthony S. D'Mello
5. The wavelength of X-rays is of the order of
  A.  1 cm
  B.  1 m
  C.  10 micron
  D.  1 Angstrom (Ans-D)