MCQ
In the depletion region of a diode:
- AThere are no mobile charges.
- BEqual number of holes and electrons exist, making the region neutral.
- CRecombination of holes and electrons has taken place.
- DImmobile charged ions exist.
✓
Answer
- There are no mobile charges.
- Equal number of holes and electrons exist, making the region neutral.
- Immobile charged ions exist.
Solution:
On account of difference in concentration of charge carrier in the two sections of P-N junction, the electrons from N-rcgion diffuse through the junction into P-region and the hole from P-region diffuse into N-region.
Due to diffusion, neutrality of both N-and P-type semiconductor is disturbed, a layer of negative charged ions appear near the junction in the P-crystal and a layer of positive ions appears near the junction in N-crystal. This layer is called depletion layer.
The thickness of depletion layer is 1 micron = 10-6m.
Width of depletion layer ∞ 1/Dopping
Depletion is directly proportional to temperature.
Important point: The P-N junction diode is equivalent to capacitor in which the depletion layer acts as a dielectric.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
More "M.C.Q (1 Marks)" from Semiconductor Electronic: Material, Devices And Simple Circuits→Semiconductor Electronic: Material, Devices And Simple Circuits — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→
Similar questions
Four condensers are joined as shown in the adjoining figure. The capacity of each is 8 μF. The equivalent capacity between the points A and B will be
|
(a) 32 μF |
(b) 2 μF |
(c) 8 μF |
(d) 16 μF |
A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to the electron stream and above it. If the current in the conductor is from left to right, what will be the effect on the electron stream?
Two identical metal plates show photoelectric effect by a light of wavelength 
falls on plate A and 
on plate B (
. The maximum kinetic energy is
|
(a) 2 |
(b) |
(c) |
(d) |
The ratio of radii of nuclei 
and 
is 3 : 5. The number of neutrons in the nuclei of X will be
|
(a) 52 |
(b) 73 |
(c) 125 |
(d) 13 |
The rubber used in the wheels of aero-plane is _________?
We combined a convex lens of focal length f1 and concave lens of focal lengths f2 and their combined focal length was F. The combination of these lenses will behave like a concave lens, if
|
(a) f1 > f2 |
(b) f1 < f2 |
(c) f1 = f2 |
(d) f1 ≤ f2 |
Three identical capacitors are combined differently. For the same voltage to each combination, the one that stores the greatest energy is
|
(a) Two in parallel and the third in series with it |
(b) Three in series |
|
(c) Three in parallel |
(d) Two in series and third in parallel with it |
In which type of molecule positive and negative charges does not coincide with each other?
In a cassette player, material used for coating magnetic tapes is:
The magnitude and direction of the current in the circuit shown will be
|
(a) |
(b) |
|
(c) 1 A from b to a through e |
(d) 1 A from a to b through e |
