Physics GK 10 - Floatation

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1.
What happens when a ship enters a Sea from a river ?
2.
A cardboard is placed on a glass of water, and a ten paise coin is placed on the cardboard. If the cardboard is flicked suddenly in the direction parallel to its surface, then the cardboard flies away, but the coin falls in the glass.
The behaviour of the coin can be explained by which among the following properties?
3.
A piece of Ice was tied with a string to a water bucket’s bottom, and the water bucket was filled with water with ice fully submerged in it. What would be the impact on the level of water when the ice melts away completely?
4.
In which of the following conditions, a Balloon filled with a gas such as Hydrogen will tend to rise up?
5.
Who was the first to state the principle of floatation?
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