Welcome to your Density and Pressure(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Water and kerosene are drawn respectively into two limbs of a Hare's apparatus. Density of water is 1.0g/cm³ and the density of kerosene is 0.80g/cm³. If the height of the water column is 20.0cm, calculate the height of the kerosene column. 20.8cm 20.0cm 1.6cm 16.0cm 25.0cm None 2. Oil from a bottle flows out more easily after it has been warmed because friction between the oil layer is reduced osmotic pressure of the oil is increased oil molecules force one another out molecules are given potential energy during warming cohesion between the oil molecules and those of the bottle is reduced None 3. Two divers G & H are at depths 20m & 40m respectively below the water surface in a lake. The pressure on G is P1 while the pressure on H is P2 . If the atmospheric pressure is equivalent to 10m of water, the value of P2 /P1 is 0.50 60 3.00 1.67 2.00 None 4. Which of the following statements about liquid pressure is NOT correct? The pressure is exerted equally in all directions at any point at any point in a liquid is the same at the same level of a liquid at any point on the wall of its container acts in all directions perpendicular to the wall at a particular depth depends on the shape of the vessel at a point in a liquid is proportional to the depth None 5. The hatch door of a submarine has an area of 0.5m². The specific gravity of sea water is 1.03, assume that g = 10m/s² and neglect the atmospheric pressure, the force exerted by the sea water on the hatch door at the depth of 200m is 10,300N 206,000N 1,030,000N 103,000N 1,030N None 6. What is the total pressure in cmHg at a point 15m below the surface of a fresh water reservoir. Atmospheric pressure, 76cmHg, density of mercury is 13.6g/cm³ 186cm 1.86cm 18.6cm 1860cm None 7. 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. 4m/s 30m/s 1.5m/s 9m/s None 8. A hose ejects water at a speed of 15cm/s through a hole of area 75cm². If the water strikes a wall normally, calculate the force on the wall. (Assuming that the velocity of water after striking the wall is zero and density of water = 1000kg/m³). 0.507N 0.676N 0.169N 0.338N None 9. When a paint brush is removed from clean water, the bristles of the brush are pulled together because of the mass of the brush bristles the weight of the brush bristles low density of water the viscousity of the surrounding surface tension None 10. The rise or fall of a liquid in a narrow tube is because of the the viscousity of the liquid the osmotic pressure of the liquid the friction between the walls of the tube and the liquid the surface tension of the liquid None 11. In which of the following is surface tension important? the diffusion of sugar solution across a membrane the floating of dry needle in water the floating of balloon in air the floating of a ship in water None 12. The diagram is of a faultless simple mercury barometer. Which of the following is NOT correct? as the barometer is taken up a mountain, h, decreases the atmospheric pressure supports a column of mercury, h the height of the column will not be the same if another liquid is used instead of mercury if the tube is tilted, the vertical height of the mercury column will change a vacuum exists above the mercury in the tube None 13. Calculate the pressure on Radeyah's thumb when she exerts a force of 20N and the top of the pin is square, the length of each side being 10mm0.2N/mm² 20N/mm² 0.2N/mm² 2N/mm² 12N/mm² None 14. Relative density of zinc, brass, copper, gold and silver are 7.1, 8.5, 8.9, 19.3 & 10.5 respectively. A metal ornament which weighs 0.425kg and can displaced 50 x 10-6m³ of water is made of brass silver gold copper zinc None 15. A pilot records the atmospheric pressure outside the plane as 63cm of Hg while a ground observer records a reading of 75cmHg for the atmospheric pressure on the ground. Assuming that the density of the atmosphere is constant, calculate the height of the plane above the ground. (Relative density of Hg = 13.0 and of the air = 0.00013). 12,000m 6,300m 7,500m 13,800m None 16. A U-tube contains some mercury of R.D 13.6. Kerosene of R.D 0.8 is poured into an arm of the U-tube until the height of the mercury in that arm is reduced by 1.5cm. Calculate the height of kerosene. 20cm 13.6cm 25.5cm 1.5cm None 17. When pressure is applied by means of a piston to the surface of a liquid contained in a cylinder, the pressure transmitted to the liquid is greater at the surface than at the bottom of the liquid all at the bottom of the liquid smaller at the surface than at the bottom of the liquid the same at every point in the liquid only at the surface of the liquid None 18. A balloon whose volume is 300m³ is filled with hydrogen. If the density of air is 1.3kg/m³, find the upthrust on the balloon 3,800N 3,000N 4,200N 3,900N None 19. 1000 identical drops of oil of density 500kg/m³ have a total mass of 0.0005kg. One of the drops form a thin film of area 0.5m² on water. The thickness of the film is. 0.000000002m 0.000000003m 0.0000002m 0.00000002m None 20. A metal cube of volume 10³mm³ is lowered into a measuring cylinder containing water. If the internal cross-sectional area of the cylinder is 1.5 x 10²mm², by how much does the water level rise in the cylinder? 1150mm 6.67mm 8500mm 2500mm 150000mm None 21. A cube of side 10cm and mass 0.5kg floats in a liquid with only one-fifth of its height above the surface of the liquid. What is the R.D of the liquid? 0.125 0.250 0.625 2.500 None 22. A parachute attains a terminal velocity when its density is equal to the density of air the viscous force of the air and the upthrust completely counteract its weight it expands as a result of reduced external pressure the viscous force of the air is equal to the sum of the weight and upthrust None 23. I. massII. densityIII. temperatureIV. nature of substanceWhich of the above affects diffusion? none of the above II, III & IV only I & II only I, II & IV only all of the above None 24. A solid weighs 0.040N in air and 0.025N when fully immersed in a liquid of density 800kg/m³. Calculate the volume of the solid 0.000002kg/m³ 0.0000025kg/m³ 0.00002kg/m³ 0.000003kg/m³ None 25. If a fluid flows out of a narrow tube at a depth h below the surface, its velocity is √2ghρ 2gh hρg gh √2gh None 1 out of 25 Time's upTime is Up!