Physics
In a bipolar junction transistor

The base has the least concentration of impurity
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

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Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and remain floating
Burst after reaching some height
Reach a particular height and start coming down

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised

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