1. Density is defined as   volume / mass   mass × volume   mass × acceleration   mass / volume   Hint Half-n-half Clue   2. Which of these has the lowest density?   Cork   Water   Aluminum   Glass   Half-n-half Clue   3. Hot air is less dense than cold air.   True   False   4. 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 more dense than oil.   Water floats on oil because water is less dense than oil.   Half-n-half Clue   5. An object floats in liquid L1, but it sinks to the bottom in liquid L2. Which statement of the following is true?   Liquid L1 has a lower density than liquid L2.   No definite conclusion can be made about the liquid densities.   Liquids L1 and L2 have the same density.   Liquid L1 has a higher density than liquid L2.   Half-n-half Clue   6. Which of the following statements is true?   Sea water is less dense than fresh water.   Sea water has the same density as fresh water.   Sea water may be more dense or less dense than fresh water.   Sea water is more dense than fresh water.   Half-n-half Clue   7. Water has the maximum density at   -4oC   40oC   4oC   0oC   Half-n-half Clue