- ALight
- BElectrical current
- CBoth A and B
- DNone of the above
Explanation:
Optoelectronic devices and components are those electronic devices that operate on both light and electrical currents. This can include electrically driven light sources such as laser diodes and light-emitting diodes, components for converting light to an electrical current such as solar and photovoltaic cells and devices that can electronically control the propagation of light.
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If and
are the electric and magnetic field vectors of E.M. waves then the direction of propagation of E.M. wave is along the direction of
|
(a) |
(b) |
(c) |
(d) None of these |
A condenser of capacitance 10 μF has been charged to 100 volts. It is now connected to another uncharged condenser in parallel. The common potential becomes 40 volts. The capacitance of another condenser is
|
(a) 15 μF |
(b) 5 μF |
(c) 10 μF |
(d) 16.6 μF |
In a PN-junction
|
(a) P and N both are at same potential |
|
(b) High potential at N side and low potential at P side |
|
(c) High potential at P side and low potential at N side |
|
(d) Low potential at N side and zero potential at P side |
The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the electric field at the same point will be
|
(a) E |
(b) E/4 |
(c) E/2 |
(d) 2E |
The total charge induced in a conducting loop when it is moved in magnetic field depends on
|
(a) The rate of change of magnetic flux |
(b) Initial magnetic flux only |
|
(c) The total change in magnetic flux |
(d) Final magnetic flux only |
Amount of light entering into the camera depends upon
|
(a) Focal length of the objective lens |
|
(b) Product of focal length and diameter of the objective lens |
|
(c) Distance of the object from camera |
|
(d) Aperture setting of the camera |