1. Hot air is less dense than cold air.   True   False   2. The fraction of an iceberg submerged below the water surface is   1 / 5   1 / 10   4 / 5   9 / 10   Hint Half-n-half Clue   3. The SI unit of density is   g/cm3   kg/m3   m3/kg   cm3/g   Half-n-half Clue   4. The density of carbon dioxide is 1.8 kg/m3. So, the volume occupied by 9.0 kg of carbon dioxide is   16.2 m3   0.2 m3   None of these   5 m3   Half-n-half Clue   5. Density is defined as   mass / volume   mass × volume   mass × acceleration   volume / mass   Half-n-half Clue   6. Which of these has the lowest density?   Cork   Glass   Water   Aluminum   Half-n-half Clue   7. The density of air is about 1 g/cm3 at room temperature and atmospheric pressure.   True   False