Physics
Energy is continuously created in the sun due to:

Nuclear fusion
Radioactivity
Artificial radioactivity
Nuclear fission

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

Decreasing the radius of the capillary tube
None of these
Increasing the height of water in the vessel
Increasing the radius of the capillary tube

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Physics
In a bipolar junction transistor

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

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