- AVery large
- BSmall but more than unity
- CLess than unity
- DNegative
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In AM, the centpercent modulation is achieved when
|
(a) Carrier amplitude = signal amplitude |
(b) Carrier amplitude ≠ signal amplitude |
|
(c) Carrier frequency = signal frequency |
(d) Carrier frequency ≠ signal frequency |
Two spheres A and B of radius ‘a’ and ‘b’ respectively are at same electric potential. The ratio of the surface charge densities of A and B is
|
(a) |
(b) |
(c) |
(d) |
Rutherford’s a - particle experiment showed that the atoms have
|
(a) Proton |
(b) Nucleus |
(c) Neutron |
(d) Electrons |
When light of wavelength λ is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength λ is, then
|
(a) |
(b) |
(c) 2 |
(d) |
Two coils of self inductance
and
are placed closer to each other so that total flux in one coil is completely linked with other. If M is mutual inductance between them, then
|
(a) |
(b) |
(c) |
(d) |
Energy stored in a coil of self inductance 40mH carrying a steady current of 2 A is
|
(a) 0.8 J |
(b) 8 J |
(c) 0.08 J |
(d) 80 J |
An example of a diamagnetic substance is
|
(a) Aluminium |
(b) Copper |
(c) Iron |
(d) Nickel |