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Q.1: Which one of following band is completely filled in case of conductors ?

  1. Conduction band
  2. Fermi band
  3. Valence band
  4. Forbidden band

A

Q.2: The value of resistivity for insulator is of the order of——?

  1. 105 ohm metre
  2. 106 ohm metre
  3. 107 ohm metre
  4. 108 ohm metre

D

Q.3: Forward current through a semi conductor diode circuit is due to——?

  1. minority carriers
  2. majority carriers
  3. holes
  4. electron

B

Q.4: Which one of the following is not a donor impurity ?

  1. antimony
  2. phosphorus
  3. aluminium
  4. arsenic

C

Q.5: In the transistor schematic symbol, the arrow——-?

  1. is located on the emitter
  2. is located on the base
  3. is locate on the collector
  4. points form north to south

A

Q.6: In full wave rectification the output D.C. voltage across the load is obtained for——-?

  1. The positive half cycle of input A.C.
  2. The negative half cycle of input A.C.
  3. The complete cycle of input A.C.
  4. All of the above.

C

Q.7: In half-wave rectification the output D.C. voltages is obtained across the load for——–?

  1. The negative half cycle of A.C.
  2. The positive half cycle of A.C?
  3. The positive and negative half cycles
  4. Either positive or negative half of A.C.

B

Q.8: The device used for conversion of D.C. to A.C. is called——-?

  1. Converter
  2. A rectifier
  3. Inverter
  4. Oscillator

D

Q.9: The specially designed semi-conductor diodes used as fast counters in electronic circuits are——-?

  1. The light emitting diodes
  2. Photo diodes
  3. Photo voltaic cell
  4. Solar cells.

B

Q.10: The alternating voltage is an example of——–?

  1. A digital waveform
  2. An analogue waveform
  3. Discrete waveform
  4. None at all

B