1. One kg of air is compressed from 1 m3 to 0.5 m3. Which of the following statements is true?   The density is halved.   The mass is halved.   The density is doubled.   The mass is doubled.   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.   Liquid L1 has a higher density than liquid L2.   Liquids L1 and L2 have the same density.   Half-n-half Clue   3. The density of water is about 100 kg/m3 at room temperature.   True   False   4. Water has the maximum density at   40oC   0oC   -4oC   4oC   Half-n-half Clue   5. Hot air is less dense than cold air.   True   False   6. The density of mercury is 13.6 g/cm3. So, the mass of 8 cm3 of mercury is   None of these   1 g   108.8 g   108800 g   Half-n-half Clue   7. Density is defined as   mass / volume   mass × volume   mass × acceleration   volume / mass   Half-n-half Clue