Physics
The height of a geo-stationary satellite from the Earth's surface is approximately :

42,000 km
None of these
36,000 km
30,000 km

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 0°C
Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of water at 4°C to the density of the substance

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