Semiconductor Physics MCQ

Que.31 As per Hall effect, if any specimen carrying a current I is placed in a transverse magnetic field B, then an electric field E is induced in the specimen in the direction

  • (a) parallel to I
  • (b) perpendicular to B and parallel to I
  • (c) parallel to I and B
  • (d) perpendicular to both I and B

Answer: (d) perpendicular to both I and B

Que.32 Which of the following quantities cannot be measured/determined using the Hall effect?

  • (a) Type of semiconductor (p or n)
  • (b) Mobility of charge carriers
  • (c) Diffusion constant
  • (d) Carrier concentration

Answer: (c) Diffusion constant

Que.33 The minimum energy of a photon required for intrinsic excitation is equal to

  • (a) the energy of the bottom of the conduction band
  • (b) the energy of the top of the valence band
  • (c) forbidden gap energy
  • (d) Fermi energy

Answer: (c) forbidden gap energy

Que.34 Atomic number of silicon is

  • (a) 12
  • (b) 13
  • (c) 14
  • (d) 15

Answer: (c) 14

Que.35 When donor atoms are added to the semi-conductor,

  • (a) Increases the energy band gap of the semiconductor
  • (b) Decreases the energy band gap of the semiconductor
  • (c) Introduces a new narrow band gap near the conductor band
  • (d) Introduces a new discrete energy level below the conduction band

Answer: (d) Introduces a new discrete energy level below the conduction band

Que.36 The diffusion length for holes Lp, is the

  • (a) Average distance which an injected hole travels before recombining with an electron
  • (b) Maximum distance travelled by a hole before recombining with an electron
  • (c) Length of the region in which diffusion takes places
  • (d) Minimum distance travelled by a hole before it recombines with an electron

Answer: (a) Average distance which an injected hole travels before recombining with an electron

Que.37 Doping intrinsic Silicon with Arsenic as an impurity

  • (a) Only increases the conductivity of Silicon by increasing the number of free electrons available
  • (b) Produces a semiconductor in which the charge carriers are predominantly electrons but holes are also present
  • (c) Produces a semiconductor in which the charge carriers are predominantly holes but free electrons also present
  • (d) Produces a semiconductor in which the charge carriers contain a nearly equal number of electrons and holes

Answer: (b) Produces a semiconductor in which the charge carriers are predominantly electrons but holes are also present

Que.38 Hall effect is useful for the measurement of a semiconductor’s

  • (a) mobility, carrier, concentration and temperature.
  • (b) type (n-type or p-type), conductivity and temperature.
  • (c) type (n-type or p-type), mobility and carrier concentration.
  • (d) mobility, conductivity and temperature.

Answer: (c) type (n-type or p-type), mobility and carrier concentration.

Que.39 Medium doping in Silicon and Germanium corresponds to the impurity of the order of

  • (a) 1 part in 106
  • (b) 1 part in 105
  • (c) 1 part in 104
  • (d) 1 part in 108

Answer: (a) 1 part in 106

Que.40 An electric field is applied to a semiconductor. Let the number of charge carriers is n and the average drift speed be v. If the temperature is increased then

  • (a) both n and v will increase
  • (b) n will increase but v will decrease
  • (c) v will increase but n will decrease
  • (d) both n and v will decrease

Answer: (b) n will increase but v will decrease

Hello friends, my name is Trupal Bhavsar, I am the Writer and Founder of this blog. I am Electronics Engineer(2014 pass out), Currently working as Junior Telecom Officer(B.S.N.L.) also I do Project Development, PCB designing and Teaching of Electronics Subjects.

1 thought on “Semiconductor Physics MCQ”

  1. I was extremely pleased to discover this great site. I want to thank you for one’s time just for this wonderful read!! I definitely liked every little bit of it and I also have you bookmarked to look at new information in your blog.

    Reply

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

telegram logo Join Our Telegram Group!