MCQ
Gauss's law is valid for:
- AAny closed surface.
- BOnly regular close surfaces.
- CAny open surface.
- DOnly irregular open surfaces.
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The radius of hydrogen atom in its ground state is 5.3 . After collision with an electron it is found to have a radius of 21.2
. What is the principal quantum number n of the final state of the atom
|
(a) n = 4 |
(b) n = 2 |
(c) n = 16 |
(d) n = 3 |
$\lambda'>\lambda$
$\lambda'=\lambda$
$\lambda'<\lambda$
If a star is moving towards the earth, then the lines are shifted towards
|
(a) Red |
(b) Infrared |
(c) Blue |
(d) Green |
When a wire loop is rotated in a magnetic field, the direction of induced e.m.f. changes once in each
|
(a) |
(b) |
(c) 1 revolution |
(d) 2 revolution |