MCQ
As the quantum number increases, the difference of energy between consecutive energy levels?
- ARemain the same.
- BIncreases.
- CDecreases.
- DSometimes increases and sometimes decreases.
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The speed of an electron having a wavelength of
is
|
(a) 7.25 |
(b) 6.26 |
(c) 5.25 |
(d) 4.24 |

Select the correct statement
|
(a) In a full wave rectifier, two diodes work alternately |
|
(b) In a full wave rectifier, two diodes work simultaneously |
|
(c) The efficiency of full wave and half wave rectifiers is same |
|
(d) The full wave rectifier is bi-directional. |
Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to
|
(a) Force between them × r |
(b) Force between them × 2πr |
|
(c) Force between them /2πr |
(d) Zero |