Physics
The phenomenon of change in direction of light when it passes from one medium to another is called

Dispersion
Reflection
Refraction
Propagation

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Physics
Which is evidence that supports the dynamo theory?

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

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Physics
Circuit breaker usually operate under

Transient state of short-circuit current
After D. C. component has ceased
Sub-transient state of short-circuit current
Steady state of short-circuit current

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