Danyal Education :,I. Unit 6 Pressure. A 1500kgm3 C 800kgm3. B 1000kgm3. D 500kgm3 ( ) D the packet has a small hole that allowed air to leak in.

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1 Unit 6 ressure 1. A column of liquid X floats on water in a U-tube of uniform cross-section area. If te density of water is 1000 kg m-3, find te density of liquid X. 10 :,I A 1500kgm3 C 800kgm3 B 1000kgm3 Liquid X D 500kgm3 ( ) 2. te diagrams below sow a V-saped object placed in different orientations. In wic position does te object exert te maximum pressure on te surface it is resting? A B C 3. On a cloudy day, a sealed packet of potato cips is taken to te top of a mountain. Te packet is found to be blown up like a balloon.tis could be because A te air outside te packet is now otter tan te air inside te packet. B te air outside is now at a lower pressure tan te air inside te packet. C te ultraviolet radiation as increased. D D te packet as a small ole tat allowed air to leak in. ( ) 4. In te diagram below, a person of mass 50 kg is standing on a platform over te piston of area 2.0 x m x 1O-2 m2 Wat eigt of water i will just support er? Assume tat te density of water is 1000 kg -'. A 0.25m B 2.5m C 5.0m D 10m ( ) 5 Te diagrams below sow four barometers. In wic of tese is te external pressure te greatest? A C B D

2 0.38 m Danyal 6. Te apparatus in te diagram below is set up at a constant temperature of 20 "C, d = 1-2 cm, l) = 70 cm. Air is trapped inside te left-and closed limb wile te rigt-and limb can be moved up and down. Te atmosperic pressure is 760 mm Hg. If te rigt-and limb is raised suc tat i is 15 cm, wat is te lengt of te trapped air, & d 1 I A 8.0 cm C 11.9 cm B 11.3 cm D 17.0 cm 7. Oxygen is compressed in te sealed end of a long J-tube by means of a column of open to te atmospere as sown m oxygen 'I.90 m Mercury as a density of 13.6 x 103kg m-3 and te atmosperic pressure is 1.01 x 10s a. Wat is te approximate ratio of te pressure of te oxygen to tat of te atmospere? A 1.5:1 B 2.0:7 C 2.5:L D 3.0:1 ( ) 8. Te surface of water in a domestic tank is 6 m above a cold water tap. Te density of water is 1000 kg m-3. Wat is te pressure of te water as it leaves te tap? B 600a 9 A 60a C 6000a D 60000a ( ) Te pressure produced by a cubic block is. Find te oressure iflenst /is doubled. ^'+ B + C2 D4 10. Te following diagram sows a barometer containing a liquid of density 1200 kg m-3 above te column. If te atmosperic pressure is 76 cm Hg ten te eigt of te liquid in centimetres is (Given tat te density of is kg *') A 22.7 c26 vaccum liquid I 74 cm B2 D76 ) Education

3 11. Some air is trapped in te space above te in a barometer. Let / be te eigt of te air column trapped and be te eigt of te column. Wen te glass tube is pressed down into te bat, wic of te 73 following best describes te cange of I and? I A Decrease B Remain C Decrease D Decrease Remain Decrease Decrease Increase r) '1.2. te diagram below sows a simple barometer. reservotr eigt of C Canges in te temperature of D Evaporation of from te barometer reservoir ( ) Te diagram sows a column in a testtube supported by te atmospere. Wat is te pressure of te gas given tat te atmosperic pressure is 76 cm Hg? A 81cm Hg C 71cmHg =5cm B 76 cmhg D 0cmHg ( ) 74. A rectangular block weiging 792 N as dimensions 8 cm x 6 cm x 2 cm. Wat is te maximum pressure it can exert wen it is placed on a orizontal surface? A 4 x 10aa B 72x70aa C 16 x 10aa D20x10aa ( ) 15. Te andle of te piston belowwas initially at te 5 cm mark (dotted line). Assuming tat te temperature of te air inside te cylinder is constant and tat no air is able to escape from te cylinder, wat is te pressure in te cylinder if te piston is pulled to te 20 cm mark as sown below? A Four times its initial pressure gas B Tree times its initial pressure C Reduced to a tird of its initial pressure D Reduced to a quarter ofits initial pressure ( Wic of te following does NOT cause te eigt of te column to vary? A Canges in atmosperic pressure B Canges in te value ofg

4 16. A flask is filled wit air and tigtly stoppered at room temperature. Te flask is ten placed in melting ice. Te flask stays te same size. In te flask, wat appens to te pressure of te air and te speed of te molecules in te air? ressure A Decrease B Increase C Decrease D Increase Speed of molecules Increase Increase Decrease Decrease ( ) 77. te first diagram on te left sows a simple barometer in its original state. Te next four diagrams sow te barometer after someting as been done to it.wic of te following diagrams A, B, C, or D is correct? A C D,. ti...n... ltmore added to reservoir tube was lifted iger tube was lowered furter into te reservoir 18. Te barometer sown below contains some trapped air in te tube. 90 cm cm was removed lrom te reservoir If te atmosperic pressure is 75 cm Hg, wat is te pressure exerted by te trapped air? A 5cmHg B 1OcmHg C 15cmHg D 2}cmHg ( ) 19. Two solid cubes are made from te same material. One cube as sides tat are two times as long as te oter. "1 Wen placed on one side, te small cube exerts a pressure 1 on te ground. If one area of eac side of te small cube is 21, determine te pressure exerted by te large cube standing on one of its faces. A2? B 4p CBp D73? ( ) 20. A forked tube contains air in one branc and a vacuum in te oter as sown.te pressure of te enclosed air is A ZcmHg C (- k) cmhg I d f B dcmhg D (b- d) cmhg

5 21,. Four barometers of different crosssection areas ave been set up to measure te atmosperic pressure at different places. Wic place as te lowest atmosperic pressure? A o.o1 cm2 B o.o2cm2 ",M "ff ^'L C 0.01 cm2 D O.O2 cmz "r& -+n*-,a, Jl f 22. 'Ie diagram sows a simple barometer inclined at 60" to te orizontal. 80 cm vacuum Te atmosperic pressure in cm Hg is A 27.4 B 75.2 c 69.3 D 'Ie diagram sows a water manometer made from wide glass tubing and is designed to compare te pressure oftwo gases and Q X ::"1 60' o 2cm Wic of te following statement is true? A If te pressure of gases and Qwere equal, te meniscus at Y would move down 8 cm. B Te pressure of gas Qis greater tan te pressure of gas by a column of water of eigt 8 cm. C Te pressure ofgas is greater tan te pressure of gas Qby a column of water of eigt 8 cm. D Te maximum pressure difference tat tis manometer can measure is equal to a column of water of eigt 12 cm. ( ) 24. 'Ie diagram below sows a pipette filler used to fill up a pipette wit acid.wic of te following statements is true? ^ Nozzle X liquid level A. ir a vacuum. B o as te same pressure as te atmospere. C Wen te nozzle X is pressured ligtly, te liquid level falls because te pressure in o increases. D If te surrounding atmosperic pressure suddenly decreases, te liquid level will not cange. ( ) 25. A building is 512 m ig. Wat must be te minimum water pressure in a pipe at ground level in order to get water up to a restaurant on te top floor? (Density of water = 1000 kg *-', acceleration due to gravity = 10 m s 2) A 1x10sa B 5x106a C 6x10sa D 5x108a ( ) 26. Wen a barometer is taken up a balloon, te level A falls, because air pressure increases wit eigt. B falls, because air pressure decreases wit eigt. C rises,because airpressure increaseswiteigt. D rises, because air pressure decreases wit eigt. ( )

6 27. te diagram sows a water manometer wit one end connected to te gas tap and te oter end left open. If te pressure of te gas increases by a value equivalent to,c m of water pressure and atmosperic pressure, decreases by a value equal m of water pressure, te value of G will be to / increased by Gm water manometer A (x+y)m C 2(x+y)m rubber tubing gas tap B (x-) m D (y-*)^ 28. Diagram 1 sows a J-saped tube containing 3.0 cm3 of air trapped by. Te levels are te same on bot sides of te tube. More is poured into te open tube until te levels differ by 76 cm, as sown in diagram 2. Te atmosperic pressure remains constant at 76 cm of. 3.0 cm3 1 mercu 76 cm Wat is te volume V of te trapped air sown in diagram 2? B 0.67 cm3 A 0.50 cm3 C 1.0 cm3 D 1.50 cm3 ( ) Z ( ) 29. 'Ie diagram sows a bubble at te bottom of a pool. Assuming tat te temperature of te pool is constant trougout te water, wic of te following describes te cange of te pressure and te density ofair in te bubble as it rises to te surface? ressure Density Increase A Increase B Increase Decrease C Decrease Increase D Decrease Decrease ( ) 30. Diagram 1 represents a -filled simple barometer as would be used to measure atmosperic pressure. Diagram 2 sows te same barometer after a volatile liquid as been introduced on top of te and a small quantity can be seen on top of te. Te saturated vapour pressure of te liquid, in terms of te lengt of column, is A W+Y C Z+X t x rx t/ Y BY waterbubble 2 D Z_X I ( )

7 31. Te diagram sows a barometer on a day wen te atmosperic pressure is 750 mm Hg. 33. A forked tube contains air in one branc and a vacuum in te oter mm mm 0mm Wat is te pressure at te point at te bottom of te column? A 0mmHg B 150mmHg C 750mmHg D 900mmHg ( ) 32. As a ydrogen balloon rises from ground level to an altitude of 300 m, its volume increases. Wic pressure canges ave occurred witin te balloon and te air outside te balloon? ressurecange ressurecange ofairoutside inteballoon A Decrease Decrease B Decrease Increase C Increase Decrease D Increase Increase ( + 50 mm t 200 mm 600 mm Te pressure of te enclosed air in mm Hg is A50 B150 c2o0 D600 ( ) 34. A balloon filled wit elium was released from te bottom of a tall building at sea level. At te bottom of te building, te balloon ad a volume of 500 cm3,wile at te top, te volume was found to be 510 cm3. Te pressure at sea level is a. If te density of air is 1.29 kg m-3, wat is te eigt of te building? A 1.26m B 1.32m C 1.52m D 760m ( ) 35. A eigt of 0.81 m of a column of a turpentine exerts te same amount of pressure as a ear,y box ofweigt of N.Te base area of te box is 10 m2. Wat is te density of turpentine? A 8400kgm3 B 6804kgm3 C 1000kgm3 D 840k9*-' ( ) 36. Te pressure of te water near te bottom of te wall forming a dam to a reservoir does not depend on A te dept of te water B te cross sectional area ofte reservoir C density of water D atmosperic pressure (

8 37. 'Ie diagram sows a column of air enclosed in a narrow capillary tube by a tread of 1.2 cmin lengt. 39. Te diagram below sows a simple barometer. dry air Wat is te pressure on te trapped air, given tat te atmosperic pressure is 76 cm Hg? B 64 cm Hg A 12 cmhg C 76cmHg D 88cmHg ( ) 38. Te diagram below sows a simple ydraulic jack. piston W,,.,I andle ydraulic fluid Wic of te following canges will enable eavier loads to be lifted? Dirmeter of Z DiameterofW A Doubled Remains te same B Doubled Halved C Remains te same Halved D Halved Doubled z To find te atmosperic pressure te vertical distance is measured between A andr C Qand S o R S T B Qand R D ands ( ) 40. Te diagram sows te water levels in a water manometer used to measure te pressure of a gas supply. gas supply cm 5 How muc greater tan te atmosperic pressure is te pressure ofte gas supply? B 5 cm of water A 2 cm of water C 10 cm ofwater D 12 cm ofwater 5cm 41. Wic one of te following depends on te atmospere exerting pressure? A A ball falling to te ground B Drinking troug a straw C Te sprayfrom a can cola D Bat water emptying down a plug ole (

9 42. A piston of negligible weigt encloses air in a 44. cylinder as sown. Te air expands and te piston moves 4 cm upwards.watwill be te pressure of air inside? (Atmosperic pressure of air inside is 100 ka.) air A 251<a C 7510a 8cm 12 cm B 50 ka D 100 ka 43. Water is contained in a container of base area Ar, up to eigt r.water is also contained in a second container of bigger base area Ar,btt tp to a smaller eigt r.'ie ydrostatic pressure exerted on base z4ris, wiles tat exerted on base A, is {. Wic of te following statements is correct? water A It is possible tat {,, B r. rbecause Ar> /1., C, r rbecause Ar> A, D r, rbecause br> b, 2 = rsincear> Arand lt, + to gas supply Te diagram above sows a manometer is connected to a gas supply. Te liquid levels on bot limbs of te manometer rise to a eigt difference of /. Wat canges would make te value of larger? A Increase te cross sectional area of te limbs B Use anoter liquid wic as a lower density C Use anoter liquid wic as a iger density D Carry out te experiment on a planet wic a stronger gravity ( ) 45. In one minute, a deep-sea diver breates 1 litre of air at an atmosperic pressure of 100 ka. At a certain dept in te sea, te pressure of te air supplyis 300 ka.to breate in te same mass ofair in one minute, wat volume of air would e need? 11 A jlitre B Tlitre C 1litre D 3litres ( ) 46. te diagrams below sow air trapped in a capillary tube by a small plug. Te lengt of te plug is 10 cm. Te atmosperic pressure is 76 cm Hg. trapped air trapped air Te pressure of te trapped column of air in I and II is given by Diagram I Diagram II A 10cmHg 76cmHg B 1OcmHg 86cmHg 10 cm Hg C 76 cmhg D 76cmHg 86cmHg ( ) il

10 47. 'Ie diagram below sows a U-tube containing water and oil. Given tat te density of water is 1000 kg m-3, wat is te density of oil? C wall D wall 8.0 cm A 0.80 g C 0.90 g oi B gcm' cm 10.0 cm D 1.11 g cm-3 ( ) 48. Some air is trapped in a barometer as sown in te diagram below. 90 cm air 30 cm If te atmosperic pressure is 75 cm Hg, wat is te pressure exerted by te trapped air? B 60cmHg A 3OcmHg C 15cmHg D 45cmHg ( ) 49. Wic of te diagrams sows te best design for te dam wall of a reservoir? B wall A wall cm-3 cm A long tube sealed at one end is filled wit and ten placed vertically wit its open end dipping below te surface of some contained in a dis tat is opened to te atmospere. Te tube is found to be full of. Wic of te following could explain tis fact? A Air is introduced into te tube during te transfer to te dis. B Te capillary effect makes te fill up te tube. C Te tube is 600 mm long. D Te tube is narrower at te bottom tan at te top. ( ) 51. Te diagrams below sow te same tin tube containing air trapped by a tread, eld in four different positions, R Q, R and S. Te diagrams are not drawn to scale. trapped air OR In wic order must te diagrams be placed (from left to rigt) to sow tat te volume of te trapped air is increasing? A qrs B SqR c RSq D qrs ( 52. Aladyweigs 500 N and wears stiletto soes.te area of te stiletto eel is m'?. S )

11 Te pressure te lady exerts by standing on one stiletto eel is B 5000Nm2 A 200Nm'z C N m'z D N m-'z 53. Assume tat te atmosperic pressure at sea level is equal to te pressure exerted by 0.76 m of and te acceleration of free fall does not vary wit eigt. If te average density of air is 7.2 kg m3 and tat of is kg *-', te atmosperic pressure at 3400 m above te sea level is equal to te pressure exerted by A m of. B m of. C m of. D m of. ( ) 54. Acolumn of gas is slowly compressed as sown in te diagram below. gas pistol Wic of te following graps correctly sows te relation between te gas pressure and te lengt of te gas column /? A B C tl 1_ D 0.<l- ( 1_ ) Wic one of te following statements about tem is correct? A Tey eac ave te same pressure on te base. B Te vertical-sided vessels ave te greatest pressure on te base. C Vessel (iv) as te least pressure on its base. D Vessel (i) as te greatest pressure on its base. 56. Te apparatus sown is connected to a gas tap in order to measure te pressure of te gas. Te tube contains water and te tube Qcontains some oter liquid, te liquid levels in te tubes being originally at X. o iv Level X to gas tap 55. Te following diagrams soq to te same scale, te vertical cross-sections of eac set of vessels. All of te vessels ave circular orizontal crosssections. Tey all contain water to te same level. water Wen te gas is turned on, te water in te open limb of rises to a iger level tan tat of te liquid in te open limb of Qas sown in te above diagram. Tis is because A te liquid in Qis denser tan water. B tube is closer to te gas inlet tan rube Q C tere is more liquid in tube Qtan in tube. D te pressure ofte gas exerted on is iger tan te pressure ofte gas exerted on Q iii

12 57. In an experiment to investigate te relationsip between te volume V of a frxed mass of gas and te pressure,agrapof Vagainst is plotted. Wic one of te following graps sows te correct relationsip at constant temperature? AVBV CV 58. Te diagrams (a) and (b) sow an open-ended and a closed tube manometer connected (at different times) to te same gas cylinder. Te barometer reads 760 mm. Assume tat tere is no loss in te pressure from te gas cylinder. gas 100 mm (a) D V gas cylinder + vacuum I xmm Wat is te eigt x of te in diagram (b)? A 100 mm B 660 mm C 760mm D 860mm ( ) (b) 59. Te diagram sows a barometer. Te eigt of te column is recorded. vacuum Te barometer is set up on anoter planet were te atmosperic pressure is alf tat of Eart and te gravitational field strengt is double of tat on Eart. Wic is te eigt recorded? A 0.25 B 0.5 c D2b ( ) 60. Te pressure exerted by a water jet of area 5 mm2 is 20 Ma ( a). 5 mm2 water jet t is. rl t, t. \l ll -/,' r!,'.' 1i,'.rt ---- tk--- Wat is te force exerted on te ground if te jet of water strikes te ground vertically? A 1x102N B 1x10sN C 1x106N D 1x108N ( )

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