1. The density of mercury is 13.6 g/cm3. So, the mass of 5 cm3 of mercury is   68.0 g   68000 g   2 g   None of these   Hint Half-n-half Clue   2. Which of these has the lowest density?   Glass   Water   Cork   Aluminum   Half-n-half Clue   3. The density of oxygen at room temperature is about 1.3 kg/m3. Therefore, its density in g/cm3 is   0.013   130   1300   0.0013   Half-n-half Clue   4. 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 is more dense than fresh water.   Sea water may be more dense or less dense than fresh water.   Half-n-half Clue   5. Water has the maximum density at   0oC   -4oC   40oC   4oC   Half-n-half Clue   6. 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.   Half-n-half Clue   7. The density of air is about 1 g/cm3 at room temperature and atmospheric pressure.   True   False