Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
It produces corrosion
Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water

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Physics
In a bipolar junction transistor

The collector has the least concentration of impurity
The base 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

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus changes whereas its atomic number does not change
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus does not change whereas its atomic number changes
Neither the mass number nor the atomic number of the nucleus changes

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