Which one of the following statement is ...

Which one of the following statement is correct?

A single geostationary satellite can cover the whole part of the earth for microwave communication.

Atleast three geotationary satellities in the same orbit around earth can cover the whole part of the earth for microwave communication.

The first Indian communication satellite is Telstar.

The satellite communication is not like the line of sight microwave communication.

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The correct Answer is:

Atleast three geotationary satellites in the same orbit around the earth can cover the whole part of the earth for microwave communication.

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Which one of the following statements is correct ?

Shearing stress is possible in liquids but not in gases

Elastomers are class of solids that do not obey Hooke's law

Elastic limit is the property of material of body whereas elasticity is the property of a body

Bulk modulus of most of the solid material is zero

Horsetails are gymnosperms

Selaginella is heterosporous, while Salvinia is homosporous

Ovules are not enclosed by ovary wall in gymnosperms.

Stems are usually unbrancned in both Cycas Cedrus

Oxidation of a substance is followed by the reduction of another

Reduction of a substance is followed by the reduction of another

Oxidation and reduction are complementary reactions

It is not necessary that both oxidation and reduction should take place in the same reaction