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. 738.3mm 100mm 130mm 765.8mm 2. The terminal velocity of a ball-bearing falling through a viscous fluid is reached when the ball accelerates uniformly velocity is uniform upthrust is equal to the weight of the ball upthrust is equal to the velocity of the ball 3. The mass of a stone is 15g when completely submerged in water and 10g when completely submerged in a liquid of R.D 2.0. The mass of the stone in air is 5g 20g 12g 25g 4. 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? 125cm³ 120cm³ 50cm³ 5cm³ 5. 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 is 9,600,000N/m² 9,400,000N/m² 20000N/m² 950,000N/m² 6. Relative density of zinc, brass, copper, gold and silver are 7.1, 8.5, 8.9, 19.3 & 10.5 respectively. A metal ornament which weighs 0.425kg and can displaced 50 x 10^{-6}m³ of water is made of brass copper zinc silver gold 7. Two divers G & H are at depths 20m & 40m respectively below the water surface in a lake. The pressure on G is P_{1 } while the pressure on H is P_{2} . If the atmospheric pressure is equivalent to 10m of water, the value of P_{2} /P_{1} is 0.50 1.67 2.00 60 3.00 8. When a paint brush is removed from clean water, the bristles of the brush are pulled together because of low density of water the weight of the brush bristles the viscousity of the surrounding surface tension the mass of the brush bristles 9. The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a ? biurette density bottle measuring cylinder eureka can pipette 10. What is the total pressure in cmHg at a point 15m below the surface of a fresh water reservoir. Atmospheric pressure, 76cmHg, density of mercury is 13.6g/cm³ 1.86cm 18.6cm 1860cm 186cm 11. A solid of weight 0.6N is totally submerged in oil and water respectively. If the upthrust in oil is 0.21N and the R.D of oil is 0.875, find the upthrust in water. O.18N 0.6N 0.360N 0.24N 12. 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) 240,000N 1,700N 20,000N 24,000N 13. The density of 400cm³ of oil was 0.9g/cm³ before frying. If the density of the oil was 0.6g/cm³ after frying, assuming no loss of oil due to spilling, its new volume was 360cm³ 600cm³ 800cm³ 240cm³ 450cm³ 14. 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) 15.56cm 19.80cm 10.34cm 21.00cm 15. Which of the following is most viscous at room temperature? palm oil petrol kerosene alcohol water 16. When the temperature of a liquid is increased, its surface tension. decreases increases remains constant increases then decreases 17. The pressure exerted by a liquid in a container is dependent on the volume of the liquid density of the liquid mass of the liquid cross-sectional area of the container 18. 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? 20,000N/m² 40,000N/m² 30,000N/m² 90,000N/m² 19. 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 0.2N/mm² 20N/mm² 12N/mm² 20. A parachute attains a terminal velocity when the viscous force of the air is equal to the sum of the weight and upthrust the viscous force of the air and the upthrust completely counteract its weight its density is equal to the density of air it expands as a result of reduced external pressure 21. 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. III only I only II & III only I & II only II only 22. 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? 1150mm 8500mm 150000mm 2500mm 6.67mm 23. 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? III & IV only I & II only I & III only II & III only 24. At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? (density of sea water = 1013kg/m³; one atm = 101,000N/m²; g = 10m/s²) 0.1m 100m 1m 10m 25. 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 4,200N 3,800N 3,900N 3,000N 1 out of 25 Time is Up! Time's up