27/03/2020 Density and Pressure(Senior Class Physics Study by Topics) 27/03/2020 0Comments by Gate Academy Welcome to your Density and Pressure(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. 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? 5cm³ 120cm³ 50cm³ 125cm³ 2. Mechanical pumps cannot move fluids in a vertical direction move fluids in a horizontal direction decrease the pressure in an enclosure increase the atmospheric pressure compress gases in a container 3. 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 is 240m³ 600m³ 6000m³ 2400m³ 4. Water and kerosene are drawn respectively into two limbs of a Hare's apparatus. Density of water is 1.0g/cm³ and the density of kerosene is 0.80g/cm³. If the height of the water column is 20.0cm, calculate the height of the kerosene column. 1.6cm 20.8cm 20.0cm 25.0cm 16.0cm 5. 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? Stoke's law Pascal's principle Bernoulli's law Archimedes' principle 6. A heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because the tension in the string neutralizes part of the weight the pressure is low just below the water surface the density of water is less than that of the object it experiences an upthrust 7. 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 & II only I, II & III I & III only II & III only 8. A steel needle floating on the surface of water sinks when kerosene is added to the water because kerosene causes an increase in the density of water kerosene causes a decrease in the surface tension of water kerosene causes a decrease in the density of water kerosene causes an increase in the surface tension of water a steel needle is denser than kerosene 9. 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. 90cm³ 9cm³ 10cm³ 0cm³ 100cm³ 10. 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 is 0.50 3.00 2.00 60 1.67 11. Which of the following statements is/are correct about the common hydrometer?I. it has a long narrow stemII. the R.D values marked on the stem increases down the stemIII. it has a wide bulbIV. the bulb is loaded to make the hydrometer float vertically I, II & III only II & IV only II only I, II, III & IV I, III & IV only 12. In the diagram below, V is the viscosity, U is upthrust. Which of the following equations holds when the falling body P has attained a terminal velocity? V + mg = U V = mg/U V + mg + U = 0 V - U = mg V + U - mg = 0 13. The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a ? density bottle eureka can measuring cylinder pipette biurette 14. Which of the following factors influence the rate of flow of water through a pipe to houses?I. the material of the pipeII. the diameter of the pipeIII. the viscosity of the water I & III only I, II & III II & III only I & II only 15. 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 along the portion YZ value of the velocity at point X slope of the graph at point Y Area under the graph OXYZ 16. Which of the following statements is correct?The reading of pressure on a mercury barometer is dependent on the atmospheric pressure the density of mercury acceleration due to gravity the cross-sectional area of the tube the temperature of mercury 17. 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 20N/mm² 2N/mm² 12N/mm² 0.2N/mm² 18. The terminal velocity of a ball-bearing falling through a viscous fluid is reached when the upthrust is equal to the weight of the ball velocity is uniform ball accelerates uniformly upthrust is equal to the velocity of the ball 19. Mercury is suitable as a barometric fluid because it is several times denser than water is a good conductor of heat is opaque expands uniformly 20. 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? I & II only II & III only I, II & III I & III only 21. When the temperature of a liquid is increased, its surface tension. increases increases then decreases decreases remains constant 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? 6.67mm 1150mm 8500mm 2500mm 150000mm 23. 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 450cm³ 360cm³ 800cm³ 600cm³ 240cm³ 24. 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. evaporation surface tension friction viscousity 25. A balloon filled with hydrogen rises when released into the air because the density of the balloon & hydrogen is greater than the density of air the upthrust of the balloon is less than the weight the upthrust on the balloon is equal to the weight of the balloon the pressure below the balloon is greater than that above the balloon the upthrust on the balloon is greater than the weight of the balloon 1 out of 25 Time is Up! Time's up