In a hydrogen atom, the distance between the electron and proton is 2.5 
. The electrical force of attraction between them will be
|
(a) 2.8 |
(b) 3.7 |
(c) 6.2 |
(d) 9.1 |
(b) 3.7 
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Atomic weight of boron is 10.81 and it has two isotopes 
and 
. Then ratio of 
in nature would be
|
(a) 19 : 81 |
(b) 10 : 11 |
(c) 15 : 16 |
(d) 81 : 19 |
Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are
|
(a) Planes parallel to yz-plane |
|
(b) Planes parallel to xy-plane |
|
(c) Planes parallel to xz-plane |
|
(d) Coaxial cylinders of increasing radii around the x-axis |
Complete the equation for the following fission process 
|
(a) |
(b) |
(c) |
(d) |
In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n
|
(a) R/E |
(b) E/v |
(c) RE |
(d) vR |
A pure semiconductor behaves slightly as a conductor at
|
(a) Room temperature |
(b) Low temperature |
|
(c) High temperature |
(d) Both (b) and (c) |
