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

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

LED

solar cell

zener diode

photodiode

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

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

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

Yes, 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

3. Why photo diode is operated under reverse bias

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 forward 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.

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

4. For the detection of optical signal

Energy of photon > Band gap

Energy of photon = Band gap

Energy of photon < Band gap

Energy of photon greater or equals to the Band gap

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

voltage regulation

light emission

transformer

voltage generation

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

moderate doping

heavy doping

no doping

light doping

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

Zener diode

Solar cell

LED

Photodiode

8. Zener Diode is

lightly doped

moderately doped

heavily doped

no doping is there

9. Why reverse current suddenly increases at the breakdown voltage

avalanche breakdown and then internal field emission or field ionisation

due to collision of electrons with ions

internal field emission or field ionisation and then avalanche breakdown

due to temperature increase

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

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.

this statement is wrong

because resistance control the current

because diode does not conduct in reverse bias

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QUIZ 5 -SEMICONDUCTOR (SPECIAL TYPE OF DIODES)

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