In case of hydrometer, the density of liquid is equal to:
Relative density of a substance is expressed by comparing the density of that substance with the density of
Mercury
Air
Water
Iron
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.
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 wooden cylinder floats in water, with 35% of its volume above water. What is the density of wooden cylinder in SI system?
65 kg m-3
650 kg m-3
0.65 kg m-3
6.5 kg m-3
A piece of pure gold ( = 19.3 gcm-3 ) is suspected to be hollow from inside. It weighs 77.2 g in air and 71.2 g in water.The volume of the hollow portion in gold will be
3 cm3
1 cm3
2 cm3
4 cm3
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 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 body of weight W, experiences an upthrust R in water. What will be the apparent weight of the body and apparent density of the body when W<R?
Apparent weight = R - W; Apparent density = (1 - ) g cm-3
Apparent weight = W - R; Apparent density = (1000 - ) kg m-3
Apparent weight = W - R; Apparent density = (-1) g cm-3
Apparent weight = Zero; Apparent density = Zero
The mass of a body is 80 kg. When completely immersed in water, it displaces 12220 cm3 of water. What is the relative density of the material of the body?
6546
65.46
654.6
6.546
