A. A digital waveform
B. An analogue waveform
C. Discrete waveform
D. None at all
Physics
The specially designed semi-conductor diodes used as fast counters in electronic circuits are…………..?
A. The light emitting diodes
B. Photo diodes
C. Photo voltaic cell
D. Solar cells.
The device used for conversion of D.C. to A.C. is called…………..?
A. Converter
B. A rectifier
C. Inverter
D. Oscillator
In half-wave rectification the output D.C. voltages is obtained across the load for……………?
A. The negative half cycle of A.C.
B. The positive half cycle of A.C.
C. The positive and negative half cycles
D. Either positive or negative half of A.C.
In full wave rectification the output D.C. voltage across the load is obtained for………….?
A. The positive half cycle of input A.C.
B. The negative half cycle of input A.C.
C. The complete cycle of input A.C.
D. All of the above.
In the transistor schematic symbol, the arrow…………..?
A. is located on the emitter
B. is located on the base
C. is locate on the collector
D. points form north to south
Which one of the following is not a donor impurity ?
A. antimony
B. phosphorus
C. aluminium
D. arsenic
Forward current through a semi conductor diode circuit is due to…………?
A. minority carriers
B. majority carriers
C. holes
D. electron
The value of resistivity for insulator is of the order of…………?
A. 105 ohm metre
B. 106 ohm metre
C. 107 ohm metre
D. 108 ohm metre
Which one of following band is completely filled in case of conductors ?
A. Conduction band
B. Fermi band
C. Valence band
D. Forbidden band