1. Water has the maximum density at   4oC   -4oC   0oC   40oC   Hint Half-n-half Clue   2. Which of the following statements is true?   Water floats on oil because water is more dense than oil.   Oil floats on water because oil is less dense than water.   Water floats on oil because water is less dense than oil.   Oil floats on water because oil is more dense than water.   Half-n-half Clue   3. An object floats in liquid L1, but it sinks to the bottom in liquid L2. Which statement of the following is true?   Liquids L1 and L2 have the same density.   Liquid L1 has a lower density than liquid L2.   No definite conclusion can be made about the liquid densities.   Liquid L1 has a higher density than liquid L2.   Half-n-half Clue   4. The density of oxygen at room temperature is about 1.3 kg/m3. Therefore, its density in g/cm3 is   0.0013   1300   130   0.013   Half-n-half Clue   5. Hot air is less dense than cold air.   True   False   6. Density is defined as   mass × volume   volume / mass   mass / volume   mass × acceleration   Half-n-half Clue   7. A metal body of mass 81 g occupies a volume of 30 cm3. Identify the metal.   Tungsten with density = 19.4 g/cm3   Lead with density = 11.4 g/cm3   Aluminum with density = 2.7 g/cm3   Iron with density = 7.9 g/cm3   Half-n-half Clue