NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Short Answer


Name the Type of a Diode Whose Characteristics

i) Name the type of a diode whose characteristics are shown in Fig. (A) and Fig. (B) .

(ii) What does the point P in Fig (A) Represent?

(iii) What does the points P and Q in Fig (B) Represent?


  • ZENER junction diode and solar cell.
  • Zener breakdown voltage
  • Q- short circuit current
  • P- Open circuit voltage.

24 Three photo diodes and are made of semiconductors having band gaps of and , respectively. Which ones will be able to detect light of wavelength ?


  • Energy of incident light photon

  • For the incident radiation to be detected by the photodiode, energy of incident radiation photon should be greater than the band gap.
  • This is true only for D2. Therefore, only D2 will detect this radiation.

25 If the resistance is increased (Fig.) , how will the readings of the ammeter and voltmeter change?

Resistance R_1 is Increased (Fig.)


If is increased, IB will decrease. Since it will result in decrease in i.e. decrease in ammeter and voltmeter readings.