Physics
When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?

Vander waals forces
Dipole interaction
Covalent attraction
Hydrogen bond formation

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Physics
In a bipolar junction transistor

The collector has the least concentration of impurity
The emitter 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

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Physics
Super conductors are substances that

Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current
Conduct electricity at high temperature
Conduct electricity at low temperature

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