MCQ
When $NPN$ transistor is used as an amplifier
  • Electrons move from base to collector
  • B
    Holes move from emitter to base
  • C
    Electrons move from collector to base
  • D
    Holes move from base to emitter

Answer

Correct option: A.
Electrons move from base to collector
a
When $NPN$ transistor is used as an amplifier, majority charge carrier electrons of $N-$type emitter move from emitter to base and than base to collector.

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

Similar questions

Match the List$-I$ with List$-II$ 

List $I$ List $II$
$A$ Microwaves $I$ Radio active decay of the nucleus
$B$ Gamma rays $II$ Rapid acceleration and deceleration of electron in aerials
$C$ Radio waves $III$ Inner shell electrons
$D$ $X$-rays $IV$ Klystron valve

Choose the correct answer from the options given below

Distance of 5 th dark fringe from centre is $4 \,mm$. If $D =2\, m , \lambda=$ $600\, nm ,$ then distance between slits is (in $mm$)
The capacitance of a parallel plate capacitor is 12μF. If the distance between the plates is doubled and area is halved, then new capacitance will be
One plano-convex and one plano-concave lens of same radius of curvature $‘R’$ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of $1$ is $\mu_1$ and that of $2$ is $\mu _2$, then the focal length of the combination is
The equivalent inductance of two inductors is $2.4\, H$ when connected parallel and $10\, H$ when connected in series. What is the value of inductances of the individual inductors ?
Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$

Assertion $A$: The phase difference of two light waves change if they travel through different media having same thickness, but different indices of refraction.

Reason $R:$ The wavelengths of waves are different in different media.

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

A parallel plate capacitor of capacitance $20\; \mu \mathrm{F}$ is being charged by a voltage source whose potential is changing at therate of $3 \;\mathrm{V} / \mathrm{s}$. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively
A uniformly charged thin spherical shell of radius $\mathrm{R}$ carries uniform surface charge density of $\sigma$ per unit area. It is made of two hemispherical shells, held together by pressing them with force $\mathrm{F}$ (see figure). $\mathrm{F}$ is proportional to
Donor type impurity is found in
A ray of light suffers minimum deviation when incident on a $60^o$ prism of refractive index $\sqrt 2$ . The angle of incidence is......$^o$