- AMaximum
- BMinimum
- CZero
- DEqual to its magnetic flux through that surface.
Explanation:
he Gauss’s law states that the surface integral of a magnetic field over a closed surface is always zero. But the surface integral of a magnetic field over a surface gives magnetic flux through that surface.
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The width of forbidden gap in silicon crystal is 1.1 eV. When the crystal is converted in to a N-type semiconductor the distance of Fermi level from conduction band is
|
(a) Greater than 0.55 eV |
(b) Equal to 0.55 eV |
|
(c) Lesser than 0.55 eV |
(d) Equal to 1.1 eV |


An achromatic combination of lenses produces
|
(a) Coloured images |
|
(b) Highly enlarged image |
|
(c) Images in black and white |
|
(d) Images unaffected by variation of refractive index with wavelength |
The sodium nucleus
contains
|
(a) 11 electrons |
(b) 12 protons |
(c) 23 protons |
(d) 12 neutrons |
The maximum intensity in Young's double slit experiment is I0. Distance between the slits is d = 5 l, where l is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance D = 10d
|
(a) |
(b) |
(c) |
(d) |
A 220 volt, 1000 W bulb is connected across a 110 volt mains supply. The power consumed will be
|
(a) 1000 W |
(b) 750 W |
(c) 500 W |
(d) 250 W |
The refractive index of a prism for a monochromatic wave is and its refracting angle is 60°. For minimum deviation, the angle of incidence will be
|
(a) 30° |
(b) 45° |
(c) 60° |
(d) 75° |