Physics
Radio waves sent out by a radio stations are reflected by

Ionosphere
Troposphere
Stratosphere
Mesosphere

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Physics
Plants are dried up in winter due to frost because

Evaporation does not take place
Photosynthesis does not take place at such low temperature
Respiration does not take place at low temperature
There is mechanical loss of tissues and drought condition prevails

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Physics
What is refractive index ?

It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
None of above
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.

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Physics
Which is evidence that supports the dynamo theory?

Granite and basalt conduct electricity
Convection occurs in Earth's inner core
Earth's outer core contains liquid that conducts electricity
Earth's core contains a large amount of iron

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