Semiconductor Physics and Diodes MCQs

Question 1

The forward region of a semiconductor diode characteristic curve is where diode appears as

Accepted Answer

an ON switch

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a constant-current source

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a capacitor

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an OFF switch

Question 2

The peak inverse voltage (PIV) is applied across a diode when it is

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reverse-biased

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ON

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on a heat sink

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forward-biased

Question 3

When biased correctly, a Zener diode

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has a constant voltage across it

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acts as a fixed resistance

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hasa constant current passing through it

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never overheats

Question 4

When bias applied to a van-cap diode is increased, its capacitance

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is decreased

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is increased

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remains constant

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first increases and then decreases

Question 5

A light-emitting diode can be made from

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gallium arsenid

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phosphorescent material

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germanium

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silicon

Question 6

A phototube is an electronic tube

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that emits photoelectrons when its cathode is illuminated

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whose resistance decreases as its cathode is exposed to more light

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which is used for producing a brilliant flash of light for taking photographs in the dark

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that is used in TV sets for producing picture on the screen

Question 7

For converting a piece of pure silicon into a P-type extrinsic semiconductor, you will add an extremely small quantity of

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boron

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antimony

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phosphorous

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arsenic

Question 8

The maximum reverse voltage that can be applied to an ordinary semiconductor diode without irreversible damage is called

Accepted Answer

peak inverse voltage

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Zener voltage

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avalanche breakdown voltage

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cut-off voltage

Question 9

Addition of impurity in the ratio of 1 in 108 to a pure or intrinsic semiconductor

Accepted Answer

increases its conductivity nearly 100 times

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decreases its conductivity nearly 100 times

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increases its conductivity nearly 108 times

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increases its resistivity nearly 100 times