FlexiQuiz - QUIZ 5 -SEMICONDUCTOR (SPECIAL TYPE OF DIODES)

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1. A diode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect wavelength of 6000 nm?

No, because energy of photon is 2.07 eV which is less than 2.8 eV

No, because energy of photon is 0.207 eV which is less than 2.8 eV

Yes, because energy of photon is 0.207 eV which is less than 2.8 eV

Yes, because energy of photon is 2.07 eV which is less than 2.8 eV

2. Name the diode which is used in reverse breakdown region.

Solar cell

Photodiode

Zener diode

LED

3. Why reverse current suddenly increases at the breakdown voltage

due to collision of electrons with ions

due to temperature increase

avalanche breakdown and then internal field emission or field ionisation

internal field emission or field ionisation and then avalanche breakdown

4. For the detection of optical signal

Energy of photon = Band gap

Energy of photon greater or equals to the Band gap

Energy of photon > Band gap

Energy of photon < Band gap

5. Why reverse current upto breakdown is almont independent of apllied voltage?

this statement is wrong

because diode does not conduct in reverse bias

Because reverse current is due to minority charge carrier and a small voltage is sufficient to sweep the minority carriers from one side of the junction to the other side of the junction.

because resistance control the current

6. Why photo diode is operated under reverse bias

it is easier to observe the fractional change in the forward current with change in the light intensity.

it is easier to observe the change in the reverse current with change in the light intensity.

it is difficult to observe the fractional change in the reverse current with change in the light intensity.

it is easier to observe the fractional change in the reverse current with change in the light intensity.

7. A very high juntion electric field is obtained in Zener diode by

heavy doping

light doping

moderate doping

no doping

8. Zener Diode is

moderately doped

no doping is there

lightly doped

heavily doped

9. In the breakdown region, Zener voltage remains constant even though the current through the Zener diode changes.This characteristics is used in

light emission

voltage generation

voltage regulation

transformer

10. The diode which is used to detect optical signal is

solar cell

photodiode

LED

zener diode

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QUIZ 5 -SEMICONDUCTOR (SPECIAL TYPE OF DIODES)

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