Download App

14. Semicondutor electronics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics14. Semicondutor electronics1 Mark
MCQ
The correct relation between $\alpha$ (ratio of collector current to emitter current) and $\beta$ (ratio of collector current to base current) of a transistor is :
  • A
    $\beta=\frac{\alpha}{1+\alpha}$
  • B
    $\alpha=\frac{\beta}{1-\alpha}$
  • C
    $\beta=\frac{1}{1-\alpha}$
  • ✓
    $\alpha=\frac{\beta}{1+\beta}$
✓

Answer

Correct option: D.
$\alpha=\frac{\beta}{1+\beta}$
d
$\alpha=\frac{I_{C}}{I_{E}}, \beta=\frac{I_{C}}{I_{B}}$

$I_{E}=I_{B}+I_{C}$

$\alpha=\frac{I_{C}}{I_{B}+I_{C}}=\frac{1}{\frac{I_{B}}{I_{C}}+1}$

$\alpha=\frac{1}{\frac{1}{\beta}+1}$

$\alpha=\frac{\beta}{1+\beta}$

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

Two identical cells send the same current in 2Ω resistance, whether connected in series or in parallel. The internal resistance of the cell should be
→
A $15.0\, eV$ photon collides with and ionizes a hydrogen atom. If the atom was originally in the ground state (ionization potential $=13.6\, eV$), what is the kinetic energy of the ejected electron? .......... $eV$
→
Three prisms of crown glass, each have angle of prism $9^o $ and two prisms of flint glass are used to make direct vision spectroscope. What .......$^o$ will be the angle of flint glass prisms if $\mu $ for flint is $1.60$ and $\mu $ for crown glass is $1.53$
→
Which rays are not the portion of electromagnetic spectrum
→
Assertion : On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases.
Reason : Electric field is inversely proportional to square of distance from the charge or an electric dipole.
→
When $_3Li^7$ nuclei are bombarded by protons, and the resultant nuclei are $_4Be^8$, the emitted particles will be
→
A concave lens and a convex lens have same focal length of $20 cm$ and both put in contact this combination is used to view an object $5 cm$ long kept at $20 cm$ from the lens combination. As compared to object the image will be
→
A electron experiences a force $\left( {4.0\,\hat i + 3.0\,\hat j} \right)\times 10^{-13} N$ in a uniform magnetic field when its velocity is $2.5\,\hat k \times \,{10^7} ms^{-1}$. When the velocity is redirected and becomes $\left( {1.5\,\hat i - 2.0\,\hat j} \right) \times {10^7}$, the magnetic force of the electron is zero. The magnetic field $\vec B$ is :
→
Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio
→
A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube.
→