Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The ground state energy of hydrogen atom is – 13.6 eV. What is the potential energy of the electron in this state
| (a) 0 eV | (b) – 27.2 eV | (c) 1 eV | (d) 2 eV |
Which is the wrong statement in following sentences? A device in which P and N-type semiconductors are used is more useful then a vacuum type because
|
(a) Power is not necessary to heat the filament |
|
(b) It is more stable |
|
(c) Very less heat is produced in it |
|
(d) Its efficiency is high due to a high voltage across the junction |
The phenomenon of radioactivity is
|
(a) Exothermic change which increases or decreases with temperature |
|
(b) Increases on applied pressure |
|
(c) Nuclear process does not depend on external factors |
|
(d) None of the above |
In the figure shown there are two semicircles of radii 
and 
in which a current i is flowing. The magnetic induction at the centre O will be
|
(a) |
(b) |
(c) |
(d) |
