Welcome to your Density and Pressure(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. If a beaker is filled with water, it is observed that the surface of the water is not horizontal at the glass-water surface. This behaviour is due to.viscousityfrictionsurface tensionevaporation2. An object of mass 'm', volume 'v' is totally immersed in a liquid of density 'ρ'. The tension of a string holding it is(m + ρV)gmgρVg(mg)/(m - ρV)(m - ρV)g3. 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 ballII & III onlyI & II onlyI, II & IIII & III only4. The pressure at any point in a liquid at rest depends only on thesurface area and the viscousitydepth and the densityquantity and the surface areamass and the volume5. I. Density of the liquidII. Depth below the surface of the liquidIII. Surface area of the liquidIn which of the statements above will pressure be dependent?II & III onlyI & II onlyI, II & IIII & III only6. 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/mm²20N/mm²2N/mm²0.2N/mm²12N/mm²7. When a body is completely immersed in a liquid, it displaces an amount of the liquid that is equal to the I. volume of the bodyII. weight of the bodyIII. mass of the bodyWhich of the above is/are correct?II onlyI & III onlyI & II onlyI onlyIII only8. Oil from a bottle flows out more easily after it has been warmed becauseosmotic pressure of the oil is increasedmolecules are given potential energy during warmingfriction between the oil layer is reducedoil molecules force one another outcohesion between the oil molecules and those of the bottle is reduced9. It is observed that water will wet a clean glass because theadhesion of water molecules is weaker than the cohesion of water to glasscohesion of water to glass is weaker than the cohesion of water moleculescohesion of water to glass is stronger than the cohesion of water moleculesadhesion of water molecules is stronger than the cohesion of water molecules10. An object of volume 1m³ and mass 2kg is totally immersed in a fluid of density 1kg/m³. Calculate its apparent weight10N1N20N2N11. I. Density of the liquidII. Acceleration due to gravityIII. Type of container of the liquidIV. The constituents of the liquidWhich of the above conditions will NOT affect the pressure of liquid?I & III onlyI & II onlyII & III onlyIII & IV only12. 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.1.5cm25.5cm13.6cm20cm13. The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a ?eureka canpipettemeasuring cylinderbiurettedensity bottle14. 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?120cm³5cm³50cm³125cm³15. 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 is0.501.673.00602.0016. A hose of cross- sectional area 0.5m² is used to discharge water from a water tanker at a velocity of 60m/s in 20s into a container. If the container is filled completely, the volume of the container is6000m³600m³2400m³240m³17. The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is (ꝭm = 13.6g/cm3, ꝭa = 0.00013g/cm3)570mmHg480mmHg380mmHg190mmHg18. If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm. What is the radius of the cylinder?6cm12cm3cm1cm19. The opposing force which one layer of liquid exerts on another is calledviscositydynamic forceocclusionlimiting force20. A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kg/m³ and sealed. What is the maximum pressure this container can exert on a flat surface?40,000N/m² 30,000N/m² 90,000N/m² 20,000N/m² 21. The motion of a falling sphere through a viscous liquid is represented by the graph below. The terminal velocity is determined as the value of the velocity at point Xslope of the graph at point Yvalue of the velocity along the portion YZArea under the graph OXYZ22. Which of the following statements is/are true?I. detergents poured into water increases its surface tension.II. oil poured onto water reduces its surface tension.III. surface tension helps to keep the eggs of water insects aloft.I onlyII onlyIII onlyII & III onlyI & II only23. 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).3.92m39.23m0.75m0.76m24. A solid suspended by a piece of spring is completely immersed in water. On attempt to lift the solid out of water, the string breaks when the solid is partly out of water, this is becausethe solid apparently weighs less when completely immersed in water than when partially immersedthe tension in string decreases as the solid is liftedpart of the solid still in water is exerting more force on the stringthe mass of the solid is increasedthe solid is no longer in equilibrium with water25. Mercury is a better barometric fluid than water becauseI. it needs no colouringII. its density is many times greater than that of waterIII. it does not wet glassIV. it has a high boiling point.I & II onlyI, II & IIIII onlyIII & IV only26 out of 25Time is Up!
