Physics
Which of the following features of a tunnel diode is its drawback

Very low power consumptions
Extremely high frequency response
Instability due to negative resistance
Very wide temperature range of operations

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Physics
A hydrogen balloon floats up because of

The pressure inside the balloon is more than the pressure outside it
Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in weight
Air pressure decreases with decrease in height

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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
Granite and basalt conduct electricity
Convection occurs in Earth's inner core

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