Welcome to your Density and Pressure(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. 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. 130mm 100mm 765.8mm 738.3mm 2. 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? 2500mm 6.67mm 1150mm 8500mm 150000mm 3. The density of a solid is defined as the amount of water displaced when a unit mass of solid is immersed in it volume per unit mass of the solid mass per unit volume of the solid mass of the solid compared to the mass of an equal volume of water weight per unit volume of the solid 4. Which of the following is most viscous at room temperature? palm oil water alcohol petrol kerosene 5. 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 only II & III only I & II only III & IV only 6. 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 only III & IV only I, II & III II only 7. 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 4,200N 3,000N 3,900N 8. What is the theoretical maximum height through which a pump could raise water on a day when the atmospheric pressure is 760mm/Hg. (density of mercury = 13.6g/cm³) 19.80cm 15.56cm 21.00cm 10.34cm 9. 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). 0.76m 3.92m 39.23m 0.75m 10. 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 ball I & III only II & III only I, II & III I & II only 11. The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a ? measuring cylinder biurette density bottle pipette eureka can 12. Oil from a bottle flows out more easily after it has been warmed because 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 friction between the oil layer is reduced osmotic pressure of the oil is increased 13. 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) 25.5cm 5.2cm 28.0cm 2.8cm 14. It is observed that water will wet a clean glass because the cohesion of water to glass is stronger than the cohesion of water molecules cohesion of water to glass is weaker than the cohesion of water molecules adhesion of water molecules is weaker than the cohesion of water to glass adhesion of water molecules is stronger than the cohesion of water molecules 15. Two capillary tubes of the same bore are dipped into water and mercury respectively. The water level rises in one tube while the mercury level falls in the other. This is because mercury is denser than water the cohesive force of water is equal to the adhesive force between water and glass the adhesive force between mercury and glass is greater than the cohesive force of mercury the adhesive force between water and glass is greater than the cohesive force of water the molecules of mercury have stronger bonding than those of water 16. What volume of alcohol with a density of 8.4 x 10²kg/m³ would have the same mass as 4.2m³ of petrol whose density is 7.2 x 10²kg/m³? 1.4m³ 5.8m³ 5.0m³ 4.9m³ 3.6m³ 17. Air was pumped out of a sealed can and the can collapsed. Which of these statements is the best explanation for this? Pumping out of the air weakened the can The remaining air inside the can condensed to form water The material used in making the can was very weak The air pressure inside the can became less than the air pressure outside the can 18. By which of the following processes does a piece of blotting paper absorbs a drop of ink from a sheet of writing paper? the action of the force of viscousity between the molecules of the ink the capillarity rise of the ink into the blotting paper fibres the action of the forces of cohesion between the molecules of the blotting paper fibres the diffusion of the ink into the blotting paper fibres the action of the forces of cohesion between the blotting paper fibres and the ink 19. 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 7,500m 13,800m 6,300m 20. 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. 9m/s 4m/s 1.5m/s 30m/s 21. The motion of a falling sphere through a viscous liquid is represented by the graph below. The terminal velocity is determined as the slope of the graph at point Y value of the velocity at point X value of the velocity along the portion YZ Area under the graph OXYZ 22. 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? increases by 0.05 times stays constant decreases by 0.05 times increases decreases 23. A man on a bench will exert the greatest pressure on the bench when he lies flat on his belly Stands on one foot only Stands on the toes of one foot lies flat on his back stands on both feet 24. A piece of wire gauze can be made to lie on water because the water molecules repel the wire gauze upward the water surface has the effect of an elastic thin skin of the cohesive forces between the water and the wire gauze molecules the wire gauze is less dense than water 25. 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 2N/mm² 12N/mm² 20N/mm² 0.2N/mm² 1 out of 25 Time is Up! Time's up
