Welcome to your Density and Pressure(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The diagram below shows 3 identical blocks of wood floating in liquids P, Q & R. Which of the following statements is correct?the volumes of the blocks below the liquid surface are the samethe blocks will sink more as the temperatures of the liquids fallthe upthrust on each block is the samethe upthrust increases as the temperatures of the liquids fallthe upthrust decreases as the temperatures of the liquids fall2. A spherical metal ball falling through a viscous liquid is acted upon by the I. weight of the ballII. viscous force of the liquid on the ballIII. upthrust of the liquid on the ballI & III onlyI & II onlyI, II & IIIII & III only3. The terminal velocity of a ball-bearing falling through a viscous fluid is reached when theball accelerates uniformlyupthrust is equal to the velocity of the ballupthrust is equal to the weight of the ballvelocity is uniform4. 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)3.73.8417.310.55. A man on a bench will exert the greatest pressure on the bench when helies flat on his backlies flat on his bellyStands on the toes of one footstands on both feetStands on one foot only6. What is the height of the liquid column in a barometer tube that would support an atmospheric pressure of 102,000N/m² if the density of the liquid is 2,500kg/m³. (g = 10m/s²).39.23m3.92m0.76m0.75m7. An object of volume 1m³ and mass 2kg is totally immersed in a fluid of density 1kg/m³. Calculate its apparent weight20N1N10N2N8. When someone uses her thumb to push a drawing pin into a block of wood, the pressure on the wood is greater than the pressure on the thumb. Answer True (T) or False (F)9. The water manometer in the diagram below is measuring the pressure of the gas supply. If the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cmHg, what is the total pressure of the gas supply in cm of water?949cm952cm955cm67cm73cm10. Which of the following devices are used to measure pressure?I. Aneroid barometerII. HydrometerIII. HygrometerIV. ManometerIII & IV onlyII & III onlyI & III onlyI & IV only11. 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/mm²12N/mm²0.2N/mm²2N/mm²20N/mm²12. A ship floating in clear water of density 1000kg/m³ moves to sea water of density 1050kg/m³ where it floats again. The upthrust on the ship then?stays constantincreases by 0.05 timesincreasesdecreasesdecreases by 0.05 times13. When a paint brush is removed from clean water, the bristles of the brush are pulled together because ofsurface tensionlow density of waterthe viscousity of the surroundingthe weight of the brush bristlesthe mass of the brush bristles14. 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 is1,030,000N10,300N1,030N206,000N103,000N15. It is observed that water will wet a clean glass because thecohesion of water to glass is weaker than the cohesion of water moleculesadhesion of water molecules is stronger than the cohesion of water moleculescohesion of water to glass is stronger than the cohesion of water moleculesadhesion of water molecules is weaker than the cohesion of water to glass16. A cube of glass of 5cm side and mass 306g has a cavity inside it. If the density of glass is 2.55g/cm³, what is the volume of the cavity?50cm³120cm³5cm³125cm³17. A mercury barometer, with a tube of uniform diameter and length of 850mm above the mercury level in the reservoir, reads 750mm on a day when the atmospheric pressure is 760mmHg. What will be the atmospheric pressure on a day when it reads 730mm.100mm738.3mm130mm765.8mm18. A cube of sides 0.1m hangs freely from a string. What is the upthrust on the cube when totally immersed in water?110N1000N10N700N19. The pressure at any point in a liquid at rest depends only on thedepth and the densitymass and the volumesurface area and the viscousityquantity and the surface area20. The density of a solid is defined as theweight per unit volume of the solidvolume per unit mass of the solidamount of water displaced when a unit mass of solid is immersed in itmass per unit volume of the solidmass of the solid compared to the mass of an equal volume of water21. A rectangular tank contains water to the depth of 2m. If the base is 4m x 3m, calculate the force on the base ( density of water = 1000kg/m³, g = 10m/s²)20,000N240,000N24,000N1,700N22. The mass of a specific gravity bottle is 15.2g when empty. It is 24.8g when filled with petrol and 27.2g when filled with distilled water. Calculate the R.D of petrol.1.100.901.250.8023. The rise or fall of a liquid in a narrow tube is because of thethe viscousity of the liquidthe friction between the walls of the tube and the liquidthe osmotic pressure of the liquidthe surface tension of the liquid24. A solid weighs 6.4N in air, 5.4N in water and 5.6N in kerosene. Calculate the relative density of kerosene.0.800.500.750.6025. When a ship sails from salt water into fresh water, the fraxction of its volume above the water surface will?increase then decreaseremains the sameincreasedecrease26 out of 25Time is Up! Time's up
