Complete the reaction ![]()
|
(a) |
(b) |
(c) |
(d) |
Complete the reaction ![]()
|
(a) |
(b) |
(c) |
(d) |
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The V-i graphs A and B drawn for two voltameters. Identify each graph
|
(a) A for water voltameter and B for Cu voltameter |
|
(b) A for Cu voltameter and B for water voltameter |
|
(c) Both A and B represents Cu voltameter |
|
(d) None of these |
A magnetic needle suspended horizontally by an unspun silk fibre, oscillates in the horizontal plane because of the restoring force originating mainly from
| (a) The torsion of the silk fibre |
| (b) The force of gravity |
|
(c) The horizontal component of earth's magnetic field |
| (d) All the above factors |
The optical density of turpentine is higher than that of water while its mass density is lower. Fig. shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Fig, the path shown is correct?

The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)
|
(a) |
(b) |
(c) |
(d) |
The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr's theory, the energy corresponding to a transition between the 3rd and the 4th orbit is
|
(a) 3.40 eV |
(b) 1.51 eV |
(c) 0.85 eV |
(d) 0.66 eV |