Welcome to your Density and Pressure(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Which of the following statements is correct?The reading of pressure on a mercury barometer is dependent onthe density of mercuryacceleration due to gravitythe atmospheric pressurethe temperature of mercurythe cross-sectional area of the tube2. A parachute attains a terminal velocity whenthe viscous force of the air is equal to the sum of the weight and upthrustthe viscous force of the air and the upthrust completely counteract its weightits density is equal to the density of airit expands as a result of reduced external pressure3. In which of the following is surface tension important?the floating of a ship in waterthe floating of balloon in airthe floating of dry needle in waterthe diffusion of sugar solution across a membrane4. A hydrometer is an instrument for measuring thedepth of water in a vesselrelative density of a liquid by finding the apparent loss in weightrelative humidity of the airatmospheric pressure when the air is humidrelative density of a liquid by the method of floatation5. A spiral spring, loaded with a piece of metal, extends by 10.5cm in air. When the metal is fully submerged in water, the spring extends by 6.8cm. Calculate the relative density of the metal. (Assume Hooke's law is obeyed)10.53.717.33.846. At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? (density of sea water = 1013kg/m³; one atm = 101,000N/m²; g = 10m/s²)100m10m1m0.1m7. A balloon of volume 100m³ and mass 2kg is filled with helium of density 0.18kg/m³ at ground level. The surrounding air has a density of 1.28kg/m³. Calculate the maximum mass which the balloon can lift off the ground.120kg108kg128kg85kg8. Which of the following is most viscous at room temperature?waterpetrolalcoholkerosenepalm oil9. When a ship sails from salt water into fresh water, the fraxction of its volume above the water surface will?remains the sameincrease then decreasedecreaseincrease10. By which of the following processes does a piece of blotting paper absorbs a drop of ink from a sheet of writing paper?the action of the forces of cohesion between the blotting paper fibres and the inkthe diffusion of the ink into the blotting paper fibresthe capillarity rise of the ink into the blotting paper fibresthe action of the force of viscousity between the molecules of the inkthe action of the forces of cohesion between the molecules of the blotting paper fibres11. If the relative density of a metal is 19. What will be the mass of 20cm³ of the metal when immersed in water?400g180g380g360g39g12. A known sprinkler has 20 holes of cross-sectional area 0.02cm² and is connected to a hose pipe of cross-sectional area 0f 2.4cm². If the speed of the water in the hose pipe 1.5cm/s, find the speed of the water as it emerges from the holes.9m/s1.5m/s30m/s4m/s13. A solid of weight 0.6N is totally submerged in oil and water respectively. If the upthrust in oil is 0.21N and the R.D of oil is 0.875, find the upthrust in water.0.6N0.360N0.24NO.18N14. Water does not drip through an open umbrella of silk material unless the inside of the umbrella is touched.Which of the following phenomenon is responsible for this?osmosissurface tensionhydrostatic upthrustdiffusionviscousity15. A piece of cork floats in a liquid. What fraction of its volume would be immersed in the liquid? (density of the cork = 0.25 x 10³kg/m³, density of the liquid = 1.25 x 10³kg/m³).0.50.80.20.116. The density of a solid is defined as theamount of water displaced when a unit mass of solid is immersed in itmass of the solid compared to the mass of an equal volume of watermass per unit volume of the solidweight per unit volume of the solidvolume per unit mass of the solid17. As a result of air at the top of a barometer, the height of the mercury column is 73.5cm when it should be 75cm, the volume of the space above the mercury is 8cm³. Calculate the correct barometric height when the barometer reads 74cm and the volume of the space above the mercury is 6cm.76cm72cm74.5cm75.1cm18. Which of the following devices are used to measure pressure?I. Aneroid barometerII. HydrometerIII. HygrometerIV. ManometerIII & IV onlyI & IV onlyII & III onlyI & III only19. An object weighs 22kg in water and 30kg in air. What is the upthrust exerted by the liquid on the object? (g = 10m/s²)220N520N50N80N20. The mass of a stone is 15g when completely submerged in water and 10g when completely submerged in a liquid of R.D 2.0. The mass of the stone in air is20g12g5g25g21. Which of the following is suitable to use an altimeter?an Aneroid barometera mercury manometera mercury barometera Fortin barometer22. In an experiment using the relative density bottle, the following results were recorded.Mass of an empty bottle + stopper = 50gMass of a bottle full of water + stopper = 80gMass of bottle full of liquid Q + stopper = 74gUse these results to calculate the relative density of liquid Q0.801.601.250.600.9323. A liquid of mass 1000kg fills a rectangular tank of length 2m. If the tank is 4m high, what is the pressure at the middle of the tank?10,000N/m² 1,500N/m² 1,000N/m² 2,000N/m² 24. A hydrometer is placed in water and 6.4cm of its stem is immersed. What is the depth of immersion when it is placed in a liquid of R.D 0.8? (density of water = 1g/cm³)60cm9cm70cm8cm25. A uniform cylindrical block of wood floats in water with one-third of its length above the water level. In a liquid of R.D 0.8, what fraction of its height would be above the liquid level?1/61/55/61/34/526 out of 25Time is Up!
