Physics
An unloaded ship is filled with sand at its bottom to …………… its centre of gravity and make its equilibrium ……………
- lower, unstable
- higher, stable
- lower, stable
- higher, unstable
Answer
lower, stable
Reason — An unloaded ship floats with very small volume inside water. As a result, its centre of gravity is higher and its equilibrium is unstable. There is a danger that it may get blown over on its side by strong winds. Therefore, an unloaded ship is filled with sand (or stones), called ballast, at its bottom. This lowers its centre of gravity to make its equilibrium stable.
Related Questions
Every ship has a white line painted on its side known as :
- Plimsoll line
- Border line
- Harbour line
- None of the above
Which of the following statements is correct ?
(i) A loaded ship is submerged more while an unloaded ship is submerged less.
(ii) A ship begins to be less submerged as it sails from sea water to river water.
- only (i)
- only (ii)
- both (i) and (ii)
- both are incorrect
It is easier for humans to swim in sea water than in river water as :
- the density of sea water is less than that of the river water.
- the density of sea water is more than that of river water.
- the sea is big in comparison to the river.
- None of the above
If a submarine is to dive, its ballast tanks are ……………, so that the average density of the submarine becomes …………… than the density of sea water.
- filled with water, greater
- filled with water, lower
- emptied, greater
- emptied, lower