The mass of 1 cm³ of iron is 7.8 g, its density in S.I. unit is :

1. 7.8 kg/cm³
2. 7.8 g cm^-3
3. 7800 g/cm³
4. 7800 kg/m³

The density of water is maximum at …………… °C and is …………… kg/m³

1. 0, 1
2. 0, 1000
3. 4, 1
4. 4, 1000

The unit of relative density is:

1. g cm^-3
2. kg m^-3
3. m³ kg^-1
4. no unit

The correct relation between density and relative density is :

1. R.D. = $\dfrac{\text{Density of substance in g cm}^{-3}}{1.0{\text{ g cm}^{-3}}}$

2. R.D. = $\dfrac{\text{Density of substance in g m}^{-3}}{1.0{\text{ g/cm}^{3}}}$

3. R.D. = $\dfrac{\text{Density of substance in kg cm}^{-3}}{1.0{\text{ g cm}^{3}}}$

4. None of these