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The schematic symbol of light emitting d...

The schematic symbol of light emitting diode (LED) is

A

B

C

D

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The correct Answer is:
B
The simbol of light emitting diode (LED) is
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A fiber of length 10 cm is illuminated with light from an light emitting diode (LED) which is turned on and off repeatedely for equal amount of time. The speed of the pulse of light are 2.00xx10^(8)m//s and 2.1xx10^(8)m//s in fiber. Maximum frequency of LED os that pulse arrive without overlapping is 60X(KHz) . Calculate X .

Assertion : Light emitting diode (LED) emits spontaneous radiation. Reason : LED are forward biased p-n junctions.

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-SEMICONDUCTORS-MHT CET Corner
  1. The schematic symbol of light emitting diode (LED) is

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  2. In an oscillator, for sustained oscillations, Barkhausen criterion is ...

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  3. Which logic gate produces LOW output when any of the inputs in HIGH

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  4. For a transitor the current ratio alpha(DC) is 69/70 the current ga...

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  5. In insulators (CB is conduction band and VB is valence band )

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  6. In common base circuit of a transistor , current amplification factor ...

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  7. In a n-type semiconductor, which of the following statement is true?

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  8. In a common emitter (CE) amplifier having a voltage gain G, the transi...

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  9. The output (X) of the logic circuit shown in figure will be

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  10. How does the width of the depletion layer of a p-n junction diode chan...

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  11. To use a transistor as an amplifier

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  12. How many NAND gates are required to realise (i) OR gates and (ii) AND ...

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  13. LED is a p-n junction diode which is

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  14. A p-n photodiode is made of a material with a band gap of 2.0 eV. The ...

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  15. In diode, when there is saturation current, the plate resistance (r(p)...

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  16. If a full wave rectifier circuit is operating from 50 Hz mains, the fu...

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  17. The depletion layer in diode is 1 mum wide and the knee potential is 0...

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  18. Which of the following is correct, about doping in a transistor ?

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  19. Freuency of given AC signal is 50 Hz. When it connected to a half - wa...

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  20. In p-type semiconductor, the major charge carriers are:

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