Electric power is transmitted over long distances through conducting wires at high voltage because
|
(a) High voltage travels faster |
|
(b) Power loss is large |
|
(c) Power loss is less |
|
(d) Generator produced electrical energy at a very high voltage |
(c) Power loss is less
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Magnification of an optical instrument is expressed in:
The resistivity of iron is 1
. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm - m will be
|
(a) |
(b) 2 |
(c) 4 |
(d) 8 |
On heating a liquid, the refractive index generally
|
(a) Decreases |
|
(b) Increases or decreases depending on the rate of heating |
|
(c) Does not change |
|
(d) Increases |
Energy in the sun is generated mainly by
|
(a) Fusion of radioactive material |
(b) Fission of helium atoms |
|
(c) Chemical reaction |
(d) Fusion of hydrogen atoms |
