1. 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   Hint Half-n-half Clue   2. 6 bars = _______ millibars   0.006   60   6000   0.6   Half-n-half Clue   3. 28 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   8.0  bar   1.75  bar   0.50 bar   28  bar   Half-n-half Clue   4. 1 Pascal = 1 _______ m-2   Joule   Dyne   Newton   Erg   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.   1000   100000   10000   100   Half-n-half Clue   6. 6 Pa = _______ dynes cm-2   60   600000   6e-05   0.6   Half-n-half Clue   7. With increase in altitude, the pressure of the atmosphere   remains constant   increases   decreases   may increase or decrease   Half-n-half Clue