The narrow stem in a hydrometer.
increases its size.
increases upthrust on it.
raises its centre of gravity.
increases its sensitivity.
In case of hydrometer for lighter liquids
its gravity bulb is heavier
the densities of lighter liquids are marked below the density of water.
the density of water is marked at the top of stem.
Its buoyancy bulb is larger
For what purpose is the acid battery hydrometer used?
To find the density of hydrochloric acid in an acid battery
To find the relative density of sulphuric acid in an acid battery
To find the density of sulphuric acid in an acid battery
To find the relative density of hydrochloric acid in an acid battery
The centre of gravity and the centre of buoyancy of a floating body in stable equilibrium(i) are always same(ii) are always along a same vertical line
only (i) is true
only (ii) is true
Both (i) and (ii) are correct
Both (i) and (ii) are false
A combination of wood and iron, just floats in the water at room temperature. Explain what you will observe when the water is heated.
The combination will still float with same position.
The combination will float on the surface of the liquid.
The combination will sink.
None of the above.
The density of ice is 0.918 g cm-3 and that of water is 1.03 g cm-3 . An iceberg floats with a portion of 224 m3 outside the surface of water. The total volume of ice berg is:
1545 m3
2575 m3
2060 m3
1030 m3
A solid of mass 22 kg is immersed in water. If it looses half of its weight in water, its R.D. will be
1/4
2
1/2
4
Relative density of silver is 10.8. Calculate its density in the SI units.
10.8 kgm-3
10800 kgm-3
1.08 kgm-3
1080 kgm-3
A substance floats in water, but sinks in coconut oil. The density of the substance
is less than the density of water and equal to the density of oil
is greater than the density of oil and equal to the density of water
is less than the density of water and greater than the density of oil
cannot be decided based on the given information.
A rubber balloon filled with hydrogen gas is left free in air.Then, the balloon
Escapes into space.
ascends upto a certain height in air and floats
ascends upto a certain height and explodes
ascends upto a certain height and then descends back to ground