Download App

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

Bihar BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
The main cause of avalanche breakdown is:
  • A
    Ionisation by collision.
  • B
    High doping.
  • C
    Recombination of electrons and holes.
  • D
    Low doping.
✓

Answer

  1. Ionisation by collision.

Explanation:

Avalanche breakdown is caused by impact ionization of electron-hole pairs. A very little current flows under reverse bias conditions and depletion region increases. The electric field in the depletion region of a diode can be very high. Electron/holes that enter the depletion region undergo a tremendous acceleration.

As these accelerated carriers collide with the atoms, they can knock electrons from their bonds, creating additional electron/hole pairs and thus additional current. As these secondary carriers are swept into the depletion region, they too are accelerated and the process repeats itself.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q [1M]" from Semiconductor Electronic: Material, Devices And Simple Circuits→Semiconductor Electronic: Material, Devices And Simple Circuits — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

An electric lamp is marked 60 W, 230 V. The cost of 1 kilowatt hour of power is Rs. 1.25. The cost of using this lamp for 8 hours is

(a) Rs. 1.20

(b) Rs. 4.00

 

(c) Rs. 0.25

(d) Rs. 0.60
→

A long wire AB is placed on a table. Another wire PQ of mass 1.0 g and length 50 cm is set to slide on two rails PS and QR. A current of 50A is passed through the wires. At what distance above AB, will the wire PQ be in equilibrium

(a) 25 mm

(b) 50 mm

(c) 75 mm

(d) 100 mm
→
The S.I. unit of electric flux is:
→
Unit of conductance is __________.
→
A wave going in a solid.
  1. Must be longitudinal
  2. May be longitudinal
  3. Must be transverse
  4. May be transverse.
→
$ n $ equal resistors are first connected in series and then in parallel. The ratio of maximum and minimum resistances will be :
→

A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image

(a) 5 mm

(b) 1 mm

(c) 0.5 mm

(d) 0.1 mm
→

The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is

(a) Covalent

(b) Metallic

(c) Dipolar

(d) Ionic
→
Consider a capacitor-charging circuit. Let Q1 be the charge given to the capacitor in a time interval of 10ms and Q2 be the charge given in the next time interval of 10ms. Let 10mC charge be deposited in time interval t1 and another 10mC charge be deposited in the next time interval t2.
  1. Q1 > Q2, t1 > t2
  2. Q1 > Q2, t1 < t2
  3. Q1 < Q2, t1 > t2
  4. Q1 < Q2, t1 < t2
→
Those substances whose valence band and conduction band are almost in a state of overlap are :
→