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