Physics
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

moves in opposite direction in which the air is blown
does not move
spins around
moves in the same direction in which air blows

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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 base has the least concentration of impurity
The emitter has the least concentration of impurity

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Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust will not get melted easily.
Saw dust is a good conductor of heat.
Saw dust does not stick to the ice.

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