Physics
The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is

Reflection
Diffraction
Interference
Dispersion

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

Their velocity increases and they fall with different velocity on the earth
Their velocity increases and they fall with same velocity on the earth
They fall with that ultimate velocity, which are different for different droplets
They fall with same ultimate velocity

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Physics
Which is evidence that supports the dynamo theory?

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
Granite and basalt conduct electricity

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