1. Water has the maximum density at   -4oC   4oC   0oC   40oC   Hint Half-n-half Clue   2. An object floats in liquid L1, but it sinks to the bottom in liquid L2. Which statement of the following is true?   No definite conclusion can be made about the liquid densities.   Liquid L1 has a lower density than liquid L2.   Liquids L1 and L2 have the same density.   Liquid L1 has a higher density than liquid L2.   Half-n-half Clue   3. The density of air is about 1 g/cm3 at room temperature and atmospheric pressure.   True   False   4. The fraction of an iceberg submerged below the water surface is   1 / 5   4 / 5   9 / 10   1 / 10   Half-n-half Clue   5. The density of water at room temperature is about   0.1 g/cm3   10 g/cm3   0.01 g/cm3   1 g/cm3   Half-n-half Clue   6. The density of water is about 100 kg/m3 at room temperature.   True   False   7. Which of the following statements is true?   Oil floats on water because oil is less dense than water.   Oil floats on water because oil is more dense than water.   Water floats on oil because water is less dense than oil.   Water floats on oil because water is more dense than oil.   Half-n-half Clue