1. Soap bubbles are spherical in shape because   spherical shape has the highest ratio of surface area to volume   air trapped inside the bubble has low pressure   air exerts equal pressure in all directions   soap film has a low surface tension   Hint Half-n-half Clue   2. Air is trapped in the space (labeled A) above the mercury level in the tube of a barometer, which measures 745 mm Hg. If the atmospheric pressure is 760 mm Hg, then the pressure of the trapped air is   745 mm Hg   15 mm Hg   between 745 and 760 mm Hg   760 mm Hg   Half-n-half Clue   3. Barometers modified to measure the height above sea level are called   sphygmomanometers   hydrometers   altimeters   manometers   Half-n-half Clue   4. 2 Pa = _______ dynes cm-2   0.2   200000   2e-05   20   Half-n-half Clue   5. If the average atmospheric pressure at sea level can support 10.34 m of vertical length of a water column, then its magnitude is about _______ Pa. Assume density of water = 1 g cm−3 and gravitational acceleration = 9.8 m s−2.   100000   100   10000   1000   Half-n-half Clue   6. Which is the 'odd one out'?   bar   Pa   mm Hg   N   Half-n-half Clue   7. 4 bars = _______ Pascals   0.0004   400000   40000   4e-05   Half-n-half Clue