1. If a pressure of  9 Pa acts on 5 m2 of area, then the force acting on the surface is   45 N   1.80 N   1.80dynes   45dynes   Hint Half-n-half Clue   2. What instrument is used for measuring atmospheric pressure?   Barometer   Hydrometer   Hygrometer   Sphygmomanometer   Half-n-half Clue   3. Which is the 'odd one out'?   Pa   mm Hg   bar   N   Half-n-half Clue   4. _______ states that the product of the pressure and volume of a fixed mass of gas is constant provided the temperature is unchanged.   Charles' Law   Boyle's Law   Dalton's Law   Avogadro's Law   Half-n-half Clue   5. Barometers modified to measure the height above sea level are called   altimeters   manometers   hydrometers   sphygmomanometers   Half-n-half Clue   6. 4 Pa = _______ dynes cm-2   0.4   40   400000   4e-05   Half-n-half Clue   7. 7 bars = _______ millibars   0.007   70   0.7   7000   Half-n-half Clue