1. One kg of air is compressed from 1 m3 to 0.5 m3. Which of the following statements is true?   The mass is halved.   The density is doubled.   The density is halved.   The mass is doubled.   Hint Half-n-half Clue   2. Which of these has the lowest density?   Glass   Aluminum   Water   Cork   Half-n-half Clue   3. A metal body of mass 189 g occupies a volume of 70 cm3. Identify the metal.   Aluminum with density = 2.7 g/cm3   Iron with density = 7.9 g/cm3   Lead with density = 11.4 g/cm3   Tungsten with density = 19.4 g/cm3   Half-n-half Clue   4. The density of water is about 100 kg/m3 at room temperature.   True   False   5. A metal body of mass 58.2 g occupies a volume of 3 cm3. Identify the metal.   Aluminum with density = 2.7 g/cm3   Tungsten with density = 19.4 g/cm3   Lead with density = 11.4 g/cm3   Iron with density = 7.9 g/cm3   Half-n-half Clue   6. Density is defined as   mass × volume   volume / mass   mass × acceleration   mass / volume   Half-n-half Clue   7. The density of mercury is 13.6 g/cm3. So, the mass of 8 cm3 of mercury is   1 g   108.8 g   108800 g   None of these   Half-n-half Clue