Q.61)-If a magnet has third pole, then the third pole is called
  • Defective pole
  • Consequent pole
  • Extra pole
  • Arbitrary pole
Q.62)-Instruments can be shelded from the outside magnetic effect by surrounding them with
  • Iron shield
  • Rubber shield
  • Brass shield
  • Glass shield
Q.63)-In electronics what comes under tank circuit?
  • Resistance and capacitor
  • Resistance and inductance
  • Capacitor and inductance
  • Resistance, capacitor and inductance
Q.64)-The substance which conducts current in the solid state is
  • Diamond
  • Graphite
  • Iodine
  • Sodium chloride
Q.65)-Good conductor of electricity is
  • Dry air
  • Paper
  • Kerosene
  • Graphite
Q.66)-Tungsten is used for the manufacture of the filament of an electric bulb, because
  • It is a good conductor
  • It is economical
  • It is malleable
  • It has a very high melting point
Q.67)-The device which converts AC to DC is
  • Oscillator
  • Amplifier
  • Rectifier
  • None of these
Q.68)-When the main switch of the house is put off it disconnects the
  • Live wire only
  • Live wire and the earth wire
  • Live wire and the neutral wire
  • Earth wire and the neutral wire
Q.69)-Magnetism in materials is due to
  • Electrons at rest
  • Circular motion of electrons
  • Protons at rest
  • All neutrons at rest
Q.70)-The fuse in our domestic electric circuit melts when there is a high rise in
  • Inductance
  • Current
  • Resistance
  • Capacitance