- ACovalent bond
- BIonic bond
- CMetalic bond
- DHydrogen bond
Explanation:
Semi-conductors are made of 14th Group elements which form covalent bonding.
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Which of the following statement is wrong
|
(a) Infrared photon has more energy than the photon of visible light |
|
(b) Photographic plates are sensitive to ultraviolet rays |
|
(c) Photographic plates can be made sensitive to infrared rays |
|
(d) Infrared rays are invisible but can cast shadows like visible light rays |
Which of the following quantities related to a lens depend on the wavelength or wavelengths of the incident light?
The wavelength of Lyman series is
|
(a) |
(b) |
(c) |
(d) |
Nuclear binding energy is equivalent to
|
(a) Mass of proton |
(b) Mass of neutron |
|
(c) Mass of nucleus |
(d) Mass defect of nucleus |
The magnetic field due to the earth is closely equivalent to that due to
|
(a) A large magnet of length equal to the diameter of the earth |
| (b) A magnetic dipole placed at the centre of the earth |
| (c) A large coil carrying current |
| (d) Neither of the above |
PN-junction diode works as a insulator, if connected
| (a) To A.C. | (b) In forward bias | (c) In reverse bias | (d) None of these |