Physics
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
Related Questions
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
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
Ice bergs float on the surface of water with their …………… portion inside the water surface and …………… portion above the water surface.
- smaller, larger
- larger, equal
- smaller, smaller
- larger, smaller
A balloon does not rise indefinitely because :
- the density of air increases with altitude
- the density of air decreases with altitude
- the weight of the displaced air increases.
- None of the above