MCQ
In a semiconductor diode, the depletion region is removed when:
- AThe diode is in its forward conducting state.
- BThe diode is in its reverse non-conducting state.
- CThere is no potential difference between the anode and cathode.
- DNone of these
Explanation:
In a semiconductor diode, when diode in its forward conducting state current starts in diode and depletion region starts to deformed. After sometime depletion region is removed.
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A heater coil is cut into two parts of equal length and one of them is used in the heater. The ratio of the heat produced by this half coil to that by the original coil is
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 1 : 4 |
(d) 4 : 1 |
To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because
|
(a) Determination of moment of inertia is not needed which minimises the errors |
| (b) Less observations are required |
| (c) Comparatively less calculations |
| (d) All the above |
Two similar spheres having +q and -q charge are kept at a certain distance. F force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as
|
(a) Zero having no direction |
(b) 8F towards +q charge |
|
(c) 8F towards -q charge |
(d) 4F towards +q charge |
Consider two point charges of equal magnitude and opposite sign separated by a certain distance. The neutral point due to them
|
(a) Does not exist |
|
(b) Will be in mid way between them |
|
(c) Lies on the perpendicular bisector of the line joining the two |
|
(d) Will be closer to the negative charge |
$\overrightarrow{\text{F}}\times\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}\times\overrightarrow{\text{r}}$