1. 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   10000   100000   100   Hint Half-n-half Clue   2. What instrument is used for measuring atmospheric pressure?   Hygrometer   Hydrometer   Sphygmomanometer   Barometer   Half-n-half Clue   3. With increase in altitude, the pressure of the atmosphere   remains constant   increases   decreases   may increase or decrease   Half-n-half Clue   4. Soap bubbles are spherical in shape because   soap film has a low surface tension   air trapped inside the bubble has low pressure   air exerts equal pressure in all directions   spherical shape has the highest ratio of surface area to volume   Half-n-half Clue   5. 30 litres of a gas at a pressure of 3 bar are compressed to 6 litres without any change in the temperature. The final pressure of the gas is about   0.60 bar   1.20  bar   15.0  bar   30  bar   Half-n-half Clue   6. A _______ measures the pressure in terms of the difference in fluid levels between the vertical arms of a glass U-tube.   Sphygmomanometer   Barometer   Hydrometer   Manometer   Half-n-half Clue   7. If the density of liquid A (carbon tetrachloride) is 1.6 g cm-3 and its height hA = 28.1 cm, then the density of oil B of height hB = 50 cm in the U-tube is about   1.11 g cm-3   0.35 g cm-3   0.90 g cm-3   2.84 g cm-3   Half-n-half Clue