- Aby reflection
- ✓by refraction
- Cby interference
- Dby diffraction
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The magnetic susceptibility is negative for
|
(a) Paramagnetic materials |
|
(b) Diamagnetic materials |
|
(c) Ferromagnetic materials |
|
(d) Paramagnetic and ferromagnetic materials |
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
|
(a) 9 : 4 |
(b) 4 : 3 |
(c) 3 : 8 |
(d) 3 : 2 |
In a cyclotron, the angular frequency of a charged particle is independent of
|
(a) Mass |
(b) Speed |
(c) Charge |
(d) Magnetic field |
Three semi-conductors are arranged in the increasing order of their energy gap as follows. The correct arrangement is
|
(a) Tellurium, germanium, silicon |
(b) Tellurium, silicon, germanium |
|
(c) Silicon, germanium, tellurium |
(d) Silicon, tellurium, germanium |
Atom bomb consists of two pieces of
and a source of
|
(a) Proton |
(b) Neutron |
(c) Meson |
(d) Electron |
Which one is not the correct statement
|
(a) 1 volt × 1 coulomb = 1 joule |
(b) 1 volt × 1 ampere = 1 joule/second |
|
(c) 1 volt × 1 watt = 1 H.P. |
(d) Watt-hour can be expressed in eV |
Minimum energy required to takeout the only one electron from ground state of
is
|
(a) 13.6 eV |
(b) 54.4 eV |
(c) 27.2 eV |
(d) 6.8 eV |
There are certain material developed in laboratories which have a negative refractive index (Fig). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by:
