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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
Question
 

Two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from thecodes(a), (b), (c) and (d) as given below.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false and R is also false.

Assertion: V - I characteristic of p-n diode is same as that of any other conductor.

Reason: p-n diode behave as conductor at room temperature.

✓

Answer

  1. A is false and R is also false.

Explanation:

The V - I characteristic of p-n di ode depends whether the junction is forward biased or reverse biased. This can be showed by graph between voltage and current.

In the given graph knee voltage is a voltage at which forward bias becomes greater than the potential barrier, the forward current increases almost linearly, where as zener voltage is a voltage at which reverse current increases suddenly. From this graph we can verify that p-n diode characteristics are very different from that of conductor which obey's Ohm's law.

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