1. What instrument is used for measuring atmospheric pressure?   Barometer   Hygrometer   Hydrometer   Sphygmomanometer   Hint Half-n-half Clue   2. Soap bubbles are spherical in shape because   air exerts equal pressure in all directions   air trapped inside the bubble has low pressure   spherical shape has the highest ratio of surface area to volume   soap film has a low surface tension   Half-n-half Clue   3. 1 Pascal = 1 _______ m-2   Joule   Dyne   Newton   Erg   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   Avogadro's Law   Dalton's Law   Half-n-half Clue   5. 2 Pa = _______ dynes cm-2   200000   2e-05   0.2   20   Half-n-half Clue   6. 21 litres of a gas at a pressure of 2 bar are compressed to 7 litres without any change in the temperature. The final pressure of the gas is about   0.67 bar   21  bar   6.0  bar   2.33  bar   Half-n-half Clue   7. Pressure is defined as   mass × acceleration   force / area   mass / volume   force × distance   Half-n-half Clue