1. _______ is a type of barometer that consists essentially of a thin metal box exhausted of air.   Manometer   Hydrometer   Aneroid   Anemometer   Hint Half-n-half Clue   2. The SI unit of pressure is   Newton   Pascal   Joule   Watt   Half-n-half Clue   3. One arm of a glass U-tube is open to the atmosphere, whereas the other vertical arm is connected to a gas supply. The difference in levels of mercury (density = 13.6 g cm-3) between the vertical arms of the U-tube manometer is h = 5 cm. If the atmospheric pressure is 760 mm Hg and the gravitational acceleration is 9.8 m s-2, then the pressure of the gas is about   1.080 × 106dynes cm-2   6.664 × 104dynes cm-2   1.020 × 107dynes cm-2   1.102 × 104dynes cm-2   Half-n-half Clue   4. Soap bubbles are spherical in shape because   air trapped inside the bubble has low pressure   spherical shape has the highest ratio of surface area to volume   air exerts equal pressure in all directions   soap film has a low surface tension   Half-n-half Clue   5. 15 litres of a gas at a pressure of 4 bar are compressed to 5 litres without any change in the temperature. The final pressure of the gas is about   1.33 bar   15  bar   1.67  bar   12.0  bar   Half-n-half Clue   6. 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   between 745 and 760 mm Hg   745 mm Hg   760 mm Hg   15 mm Hg   Half-n-half Clue   7. With increase in altitude, the pressure of the atmosphere   increases   may increase or decrease   decreases   remains constant   Half-n-half Clue