Bonding in a germanium crystal (semi- conductor) is
| (a) Metallic | (b) Ionic |
(c) Vander Waal's type |
(d) Covalent |
Bonding in a germanium crystal (semi- conductor) is
| (a) Metallic | (b) Ionic |
(c) Vander Waal's type |
(d) Covalent |
(d) Covalent
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The inductance of a closed-packed coil of 400 turns is 8 mH. A current of 5 mA is passed through it. The magnetic flux through each turn of the coil is
|
(a) |
(b) |
(c) |
(d) |
The focal length of a convex lens is 10 cm and its refractive index is 1.5. If the radius of curvature of one surface is 7.5 cm, the radius of curvature of the second surface will be
|
(a) 7.5 cm |
(b) 15.0 cm |
(c) 75 cm |
(d) 5.0 cm |
A toroid has number of turns per unit length n, current i, then the magnetic field is
|
(a) |
(b) |
(c) |
(d) None of these |
In an FM system a 7 kHz signal modulates 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is
|
(a) 7.143 |
(b) 8 |
(c) 0.71 |
(d) 350 |
If light travels a distance x in
sec in air and 10 x distance in
sec in a medium, the critical angle of the medium will be
|
(a) |
(b) |
(c) |
(d) |
Which one of these is non-divisible
|
(a) Nucleus |
(b) Photon |
(c) Proton |
(d) Atom |