Physics
When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.

Law of Inertia
Newton's third law of motion
Law of conservation of momentum
Law of conservation of energy

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

mercury is a metal.
density of mercury is greater than that of water.
cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.

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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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