MCQ
The bond, that exists in a semiconductor is:
- 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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In an adjoining figure are shown three capacitors
and
joined to a battery. The correct condition will be (Symbols have their usual meanings)

|
(a) |
(b) |
|
(c) |
(d) |
When the wavelength of light coming from a distant star is measured it is found shifted towards red. Then the conclusion is
|
(a) The star is approaching the observer |
(b) The star recedes away from earth |
|
(c) There is gravitational effect on the light |
(d) The star remains stationary |