1. The fraction of an iceberg submerged below the water surface is   1 / 5   4 / 5   9 / 10   1 / 10   Hint Half-n-half Clue   2. Which of these has the lowest density?   Cork   Glass   Water   Aluminum   Half-n-half Clue   3. The density of air is about 1 g/cm3 at room temperature and atmospheric pressure.   True   False   4. 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.   Liquid L1 has a higher density than liquid L2.   Liquids L1 and L2 have the same density.   Half-n-half Clue   5. The density of water is about 100 kg/m3 at room temperature.   True   False   6. Water has the maximum density at   40oC   0oC   -4oC   4oC   Half-n-half Clue   7. Hot air is less dense than cold air.   True   False