Download App

14. Semicondutor electronics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics14. Semicondutor electronics1 Mark
MCQ
Statement$-I :$ By doping silicon semiconductor with pentavalent material, the electrons density increases.

Statement$-II :$ The $n-$type semiconductor has net negative charge.

In the light of the above statements, choose the most appropriate answer from the options given below:

  • ✓
    Statement$-I$ is true but Statement$-II$ is false.
  • B
    Statement$-I$ is false but Statement$-II$ is true.
  • C
    Both Statement$-I$ and Statement$-II$ are true.
  • D
    Both Statement$-I$ and Statement$-II$ are false.
✓

Answer

Correct option: A.
Statement$-I$ is true but Statement$-II$ is false.
a
Pentavalent activities have excess free ${e}^{-}$

So ${e}^{-}$density increases but overall semiconductor is neutral.

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 (1 Marks)" from 14. Semicondutor electronics→14. Semicondutor electronics — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A straight wire of length $0.5\, metre$ and carrying a current of $1.2\, ampere$ placed in a uniform magnetic field of induction $2\, Tesla$. The magnetic field is perpendicular to the length of the wire. The force on the wire is.......$N$
→
The solid angle subtended by the total surface area of a sphere at the centre is:
→
A $25\,cm$ long solenoid has radius $2\,cm$ and $500$ total number of turns. It carries a current of $15\,A.$ If it is equivalent to a magnet of the same size and magnetization $\vec M$ ( magnetic moment/ volume), then $\left| {\vec M} \right|$  is
→
The correct curve between voltage gain $(A_L)$and load resistance $(R_L) $ is
→
The radius of $2^{\text {nd }}$ orbit of $He ^{+}$of Bohr's model is $r _1$ and that of fourth orbit of $Be ^{3+}$ is represented as $r _2$. Now the ratio $\frac{r_2}{r_1}$ is $x : 1$. The value of $x$ is .........
→
Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1 : 2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is
→
A parallel plate air capacitor has a capacitance of $100\,\mu  F$. The plates are at a distance $d$ apart. If a slab of thickness $t(t \le d)$and dielectric constant $5$ is introduced between the parallel plates, then the capacitance will be.......$\mu F$
→
The energy band gap $($distance between the conduction band and valence band$)$ in conductor is.
→
The introduction of a grid in a triode valve affects plate current by
→
In the uranium radioactive series, the initial nucleus is $_{92}{U^{238}}$ and the final nucleus is $_{82}P{b^{206}}$. When the uranium nucleus decays to lead, the number of $\alpha - $ particles emitted will be
→