In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change
|
(a) From n = 2 to n = 1 |
(b) From n = 3 to n = 1 |
|
(c) From n = 4 to n = 2 |
(d) From n = 3 to n = 2 |
(b) From n = 3 to n = 1
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In PN-junction diode the reverse saturation current is 
amp at 27℃ The forward current for a voltage of 0.2 volt is [exp(7.62) = 2038.6, K = 1.4 
(a) 2037.6 
|
(b) 203.76
|
(c) 20.376
|
(d) 2.0376
|
In the electric field of a point charge q, a certain charge is carried from point A to B, C, D and E. Then the work done
|
(a) Is least along the path AB |
(b) Is least along the path AD |
|
(c) Is zero along all the paths AB, AC, AD and AE |
(d) Is least along AE |
$8\ \pi\text{r}^2\text{S}$
$12\ \pi\text{r}^2\text{S}$
$16\ \pi\text{r}^2\text{S}$
$24\ \pi\text{r}^2\text{S}\cdot$
Amplification factor of a triode is 10. When the plate potential is 200 volt and grid potential is – 4 volt, then the plate current of 4mA is observed. If plate potential is changed to 160 volt and grid potential is kept at – 7 volt, then the plate current will be
|
(a) 1.69 mA |
(b) 3.95 mA |
(c) 2.87 mA |
(d) 7.02 mA |
There are n similar conductors each of resistance R. The resultant resistance comes out to be x when connected in parallel. If they are connected in series, the resistance comes out to be
|
(a) |
(b) |
(c) x/n |
(d) nx |
