CBSE Past Year MCQ Quiz

Question 1 of 5

CBSE Past Year 2026

If the given figure, \(V_{0}\) is the potential barrier across a p-n junction in an unbiased condition. Which of the following statements is correct ?

Diagram for question 7

A Curves 1 and 3 both correspond to forward biasing of p-n junction. B Curve 3 corresponds to forward biasing and Curve 1 corresponds to reverse biasing. C Curve 1 corresponds to forward biasing and Curve 3 corresponds to reverse biasing. D Curves 1 and 3 both correspond to reverse biasing.

Select one option. Answers are shown after the test.

Question 2 of 5

CBSE Past Year 2026

When the forward bias voltage in a semiconductor diode is changed from 0·8 V to 1·0 V, the forward current changes by 2·0 mA. The forward bias resistance of the diode will be :

A 200 Ω B 175 Ω C 100 Ω D 125 Ω

Select one option. Answers are shown after the test.

Question 3 of 5

CBSE Past Year 2026

A good diode checked by a multimeter should indicate :

A high resistance in reverse bias and a low resistance in forward bias B high resistance in both forward bias and reverse bias C low resistance in both reverse bias and forward bias D high resistance in forward bias and low resistance in reverse bias

Select one option. Answers are shown after the test.

Question 4 of 5

CBSE Past Year 2026

Assertion (A) : The conductivity of an n-type semiconductor is higher than that of a p-type semiconductor at a given temperature.

Reason (R) : The electrons being in the conduction band in n-type semiconductor are more mobile than the holes in the valence band in p-type semiconductor.

A Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. B Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. C Assertion is true, but Reason is false. D Both Assertion and Reason are false.

Select one option. Answers are shown after the test.

Question 5 of 5

CBSE Past Year 2026

Which of the following p-n junction diodes is forward biased ?

A A p-n junction diode in option A

B B p-n junction diode in option B

C C p-n junction diode in option C

D D p-n junction diode in option D

Select one option. Answers are shown after the test.

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