27/03/2020Density 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. 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).3.92m39.23m0.75m0.76m2. A test tube of radius 1.0cm is loaded to 8.8g. If it is placed upright in water, find the depth to which it would sink. (g = 10m/s², density of water = 1000kg/m³)2.8cm5.2cm28.0cm25.5cm3. 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 is6000m³2400m³240m³600m³4. 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 solid0.0000025kg/m³0.000002kg/m³0.000003kg/m³0.00002kg/m³5. 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 is603.000.502.001.676. If a plastic sphere floats in liquid (density = 1000kg/m³) with 0.5 of its volume submerged and floats in oil with 0.4 of its volume submerged, the density of the oil is2000kg/m³1250kg/m³800kg/m³1200kg/m³7. Air was pumped out of a sealed can and the can collapsed. Which of these statements is the best explanation for this?The remaining air inside the can condensed to form waterPumping out of the air weakened the canThe material used in making the can was very weakThe air pressure inside the can became less than the air pressure outside the can8. An open tank holds water 1.25m deep. If a small hole of cross-sectional area 3cm² is made at the bottom of the tank, calculate the mass of water per second initially flowing at the hole (g = 10m/s², density of water = 1000kg/m³)1.5kg/s4.5kg/s5.5kg/s3kg/s9. Which of the following explains the concave meniscus of water in glass tube?the weight of the water pulls the central part of the surface downthe molecules of water near the glass are moving faster than the molecules in the other partsthe molecules of water at the water-air boundary are often attracted to the center of the tubethe cohesion between water molecules is greater than the adhesion between glass and waterthe adhesion between water and glass is greater than the cohesion between water molecules10. In the diagram below, if the atmospheric pressure is 760mm, the pressure in the chamber G is860mm830mm690mm660mm11. 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?0.2502.5000.6250.12512. Oil from a bottle flows out more easily after it has been warmed becauseosmotic pressure of the oil is increasedfriction between the oil layer is reducedoil molecules force one another outmolecules are given potential energy during warmingcohesion between the oil molecules and those of the bottle is reduced13. The diagram below shows 3 identical blocks of wood floating in liquids P, Q & R. Which of the following statements is correct?the upthrust decreases as the temperatures of the liquids fallthe upthrust increases as the temperatures of the liquids fallthe blocks will sink more as the temperatures of the liquids fallthe volumes of the blocks below the liquid surface are the samethe upthrust on each block is the same14. The terminal velocity of a ball-bearing falling through a viscous fluid is reached when thevelocity is uniformupthrust is equal to the velocity of the ballupthrust is equal to the weight of the ballball accelerates uniformly15. By which of the following processes does a piece of blotting paper absorbs a drop of ink from a sheet of writing paper?the capillarity rise of the ink into the blotting paper fibresthe diffusion of the ink into the blotting paper fibresthe action of the forces of cohesion between the molecules of the blotting paper fibresthe action of the forces of cohesion between the blotting paper fibres and the inkthe action of the force of viscousity between the molecules of the ink16. 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.0.901.250.801.1017. 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)18. A piece of wood is floating on water. The forces acting on the wood areupthrust & reactionweight & reactionupthrust & viscousityweight & upthrustweight & viscousity19. A body whose mass is 2kg has a volume of 500cm³ just floats when completely immersed in a liquid. Calculate the density of the liquid1000000kg/m³1000kg/m³400kg/m³4000kg/m³20. 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)8cm9cm70cm60cm21. A steel needle floating on the surface of water sinks when kerosene is added to the water becausekerosene causes a decrease in the density of waterkerosene causes an increase in the surface tension of waterkerosene causes an increase in the density of watera steel needle is denser than kerosenekerosene causes a decrease in the surface tension of water22. The density of water is 1g/cm³ while that of ice is 0.9g/cm³. Calculate the change in volume when 90g of ice is completely melted.0cm³100cm³90cm³9cm³10cm³23. 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.0.000000002m0.0000002m0.00000002m0.000000003m24. I. massII. densityIII. temperatureIV. nature of substanceWhich of the above affects diffusion?I, II & IV onlyII, III & IV onlyall of the abovenone of the aboveI & II only25. 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 solid is no longer in equilibrium with waterpart of the solid still in water is exerting more force on the stringthe tension in string decreases as the solid is liftedthe mass of the solid is increased26 out of 25Time is Up!