- AI
- B$\frac{I}{2}$
- C2I
- ✓zero
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of
| (a) 1 MeV | (b) 0.1 MeV |
(c) 1eV |
(d) 5 eV |
The half-life of radioactive Polonium (Po) is 138.6 days. For ten lakh Polonium atoms, the number of disintegrations in 24 hours is
|
(a) 2000 |
(b) 3000 |
(c) 4000 |
(d) 5000 |
Five resistors are connected as shown in the diagram. The equivalent resistance between A and B is
| (a) 6 ohm | (b) 9 ohm |
(c) 12 ohm |
(d) 15 ohm |
In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is:
A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called
| (a) Artificial radioactivity | (b) Fusion | (c) Fission | (d) Radioactivity |
Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to 18752 Å is (Rydberg constant
per metre)
|
(a) Balmer series |
(b) Lyman series |
(c) Paschen series |
(d) Pfund series |