1. The density of air is about 1 g/cm3 at room temperature and atmospheric pressure.   True   False   2. The density of carbon dioxide is 1.8 kg/m3. So, the volume occupied by 5.4 kg of carbon dioxide is   0.3 m3   9.7 m3   3 m3   None of these   Hint Half-n-half Clue   3. The density of mercury is 13.6 g/cm3. So, the mass of 4 cm3 of mercury is   None of these   54.4 g   54400 g   3 g   Half-n-half Clue   4. Density is defined as   mass / volume   volume / mass   mass × volume   mass × acceleration   Half-n-half Clue   5. The density of water at room temperature is about   0.1 g/cm3   1 g/cm3   0.01 g/cm3   10 g/cm3   Half-n-half Clue   6. The SI unit of density is   cm3/g   m3/kg   g/cm3   kg/m3   Half-n-half Clue   7. One kg of air is compressed from 1 m3 to 0.5 m3. Which of the following statements is true?   The density is halved.   The density is doubled.   The mass is halved.   The mass is doubled.   Half-n-half Clue