Download App

14. Semicondutor electronics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics14. Semicondutor electronics1 Mark
MCQ
Assertion : Diode lasers are used as optical sources in optical communication.
Reason : Diode lasers consume less energy.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c

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

An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force
→
Minimum number of $2\,\mu F$ and $250\, V$ capacitors used to make a combination of $12\,\mu F$ and $500\,V$ are
→
This question has Statement $-1$ and Statement $-2.$ Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement $-1:$ Short wave transmission is achieved due to the total internal reflection of the $e-m$ wave from an appropriate height in the ionosphere.

Statement $-2:$ Refractive index of a ionosphere is independent of the frequency of $e-m$ waves

→
A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids $L_1$ and $L_2$ having refractive indices $n_1$ and $n_2$ respectively $\left(n_2>n_1>1\right)$. The lens will diverge a parallel beam of light if it is filled with
→
A convex lens of focal length $84 cm$ is in contact with a concave lens of focal length $12 cm.$ The power of combination (in diopters) is
→
The figure, shows a transparent sphere of radius $R$ and refractive index $\mu$ . An object $O$ is placed at a distance $x$ from the pole of the first surface so that a real image is formed at the pole of the exactly opposite surface. If $x = 2R$, then the value of $\mu$ is
→
At the magnetic poles of the earth, a compass needle will be
→
Assertion $(A):$ A spherical equipotential surface is not possible for a point charge.

Reason $(R):$ A spherical equipotential surface is possible inside a spherical capacitor.

→
A square of side ‘$a$’ has charge $Q$ at its centre and charge ‘$q$’ at one of the corners. The work required to be done in moving the charge ‘$q$’ from the corner to the diagonally opposite corner is
→
Find the false statement.
→