In PN-junction diode the reverse saturation current is 
amp at 27℃ The forward current for a voltage of 0.2 volt is [exp(7.62) = 2038.6, K = 1.4 
(a) 2037.6 
|
(b) 203.76
|
(c) 20.376
|
(d) 2.0376
|
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On increasing the number of electrons striking the anode of an X-ray tube, which one of the following parameters of the resulting X-rays would increase
| (a) Penetration power | (b) Frequency | (c) Wavelength | (d) Intensity |
Magnetic field due to 0.1 A current flowing through a circular coil of radius 0.1 m and 1000 turns at the centre of the coil is
|
(a) 2 |
(b) 4.31 |
(c) 6.28 |
(d) 9.81 |
In vacuum an electron of energy 10 keV hits tungsten target, then emitted radiation will be
|
(a) Cathode rays |
(b) X-rays |
(c) Infrared rays |
(d) Visible spectrum |
The unit of intensity of electric field is
|
(a) Newton/Coulomb |
(b) Joule/Coulomb |
(c) Volt - metre |
(d) Newton/metre |
If the energy of a photon corresponding to a wavelength of 6000 Å is 3.32 
, the photon energy for a wavelength of 4000 Å will be
|
(a) 1.4 eV |
(b) 4.9 eV |
(c) 3.1 eV |
(d) 1.6 eV |
In a single slit diffraction of light of wavelength l by a slit of width e, the size of the central maximum on a screen at a distance b is
|
(a) 2bλ + e |
(b) |
(c) |
(d) |
