Magnetism And Electromagnetism Multiple Choice Questions and Answers

36.  A permanent magnet

   A. Attracts some substances and repels others

   B. Attracts all paramagnetic substances and repels others

   C. Attracts only ferromagnetic sub stances

   D. Attracts ferromagnetic substances and repels all others

37.  The relative permeability of ..........materials is not constant.

   A. Diamagnetic

   B. Paramagnetic

   C. Ferromagnetic

   D. Insulating

38.  Ferrites are a sub-group of

   A. Non-magnetic materials

   B. Ferro-magnetic materials

   C. Paramagnetic materials

   D. Ferri-magnetic materials

39.  Degaussing is the process of

   A. Removal of magnetic impurities

   B. Removing gases from the materials

   C. Remagnetising metallic parts

   D. Demagnetising metallic parts

40.  In the left hand rule, forefinger always represents

   A. Voltage

   B. Current

   C. Magnetic field

   D. Direction of force on the conductor

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