27/03/2020 Density and Pressure(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Density and Pressure(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. 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?0.6250.1252.5000.2502. An object weighs 22kg in water and 30kg in air. What is the upthrust exerted by the liquid on the object? (g = 10m/s²)520N50N80N220N3. The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a ?pipettebiuretteeureka canmeasuring cylinderdensity bottle4. An object of volume 1m³ and mass 2kg is totally immersed in a fluid of density 1kg/m³. Calculate its apparent weight10N2N1N20N5. 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 is603.002.001.670.506. 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?120cm³50cm³5cm³125cm³7. 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 becausepart of the solid still in water is exerting more force on the stringthe solid apparently weighs less when completely immersed in water than when partially immersedthe mass of the solid is increasedthe tension in string decreases as the solid is liftedthe solid is no longer in equilibrium with water8. Why does a piece of cork float on water?the upthrust on it when completely immersed in water in greater than its weight in airits specific gravity is greater than that of waterthe upthrust on it when completely immersed in water is less than its weight in airits specific gravity is the same as that of waterthere is no upthrust on it when completely immersed in water9. 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 is2400m³600m³240m³6000m³10. A well 1km deep is filled with a liquid of density 950kg/m³. If the atmospheric pressure is 100000N/m² and g = 10m/s², the pressure at the bottom of the well is9,600,000N/m² 20000N/m² 9,400,000N/m² 950,000N/m² 11. A hydrometer is an instrument for measuring thedepth of water in a vesselatmospheric pressure when the air is humidrelative density of a liquid by the method of floatationrelative density of a liquid by finding the apparent loss in weightrelative humidity of the air12. Which of the following is obeyed if a force on a sphere moving through a viscous fluid is proportional to its speed, radius and viscosity?Bernoulli's lawStoke's lawArchimedes' principlePascal's principle13. In which of the following is surface tension important?the diffusion of sugar solution across a membranethe floating of dry needle in waterthe floating of balloon in airthe floating of a ship in water14. The pressure at any point in a liquid at rest depends only on thesurface area and the viscousityquantity and the surface areadepth and the densitymass and the volume15. Which of the following is suitable to use an altimeter?an Aneroid barometera mercury barometera mercury manometera Fortin barometer16. Mechanical pumps cannotmove fluids in a vertical directiondecrease the pressure in an enclosuremove fluids in a horizontal directioncompress gases in a containerincrease the atmospheric pressure17. 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?decreases by 0.05 timesincreases by 0.05 timesdecreasesincreasesstays constant18. For accurate measurement of atmospheric pressure, it is preferable to use which of the following instrument.fortin barometerwater manometerpressure gaugemercury manometer19. If a tube of small radius opened at both ends is placed in a liquid, the liquid willfall below the liquid level if the liquid does not wet the glassrise above the liquid level if the liquid does not wet the glassremain at the same level irrespective of whether the liquid wets the glass or notfall below the liquid level if the liquid wets the glass20. 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, decreasesthe height of the column will not be the same if another liquid is used instead of mercurythe atmospheric pressure supports a column of mercury, ha vacuum exists above the mercury in the tubeif the tube is tilted, the vertical height of the mercury column will change21. A man on a bench will exert the greatest pressure on the bench when helies flat on his backStands on the toes of one footstands on both feetlies flat on his bellyStands on one foot only22. A balloon whose volume is 300m³ is filled with hydrogen. If the density of air is 1.3kg/m³, find the upthrust on the balloon4,200N3,000N3,800N3,900N23. A steady flow of water passes along a horizontal tube from a wide section X to the narrower section Y. Manometers are placed at P & Q as shown below. Which of the statements is correct?water velocity at X is greater than at Ythe manometer at P shows greater pressure than at Ypressure at X is less than at Ythe manometer at P shows lower pressure that an Qkinetic energy of water at X = kinetic energy at Y24. 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?I onlyI & III onlyII onlyI & II onlyIII only25. 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.1.101.250.800.9026 out of 25Time is Up! Time's up
