Physics
An athlete runs before long jump to get advantage on

Moment of a force
Principle of moments
Frictional force
Inertia of motion

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Physics
When a piece of pure silicon is doped with aluminium, then

The doped silicon piece will become n-type
The conductivity of the doped silicon piece will remain the same
The resistivity of the doped silicon piece will increase
The doped silicon piece will become p-type

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Physics
A standing wave occurs when

The speed of the wave is zero or near zero
A wave reflects upon itself
Two waves overlap
The amplitude of a wave exceeds its wavelength

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Physics
In a bipolar junction transistor

The collector has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The emitter has the least concentration of impurity
The base has the least concentration of impurity

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