08/05/2020Senior Class IGCSE Mock Exams(Physics) 0Comments by Gate Academy Please, fill out the information below to continue. NAME EMAIL PHONE NUMBER 1. Normal atmospheric pressure at sea-level is 100,000N/m². The acceleration due to gravity is approximately 10m/s². If the atmosphere has uniform density 1kg/m³, the height is10,000m1000m100m100,000m1000,000m2. A piece of wood is floating on water. The forces acting on the wood areweight & upthrustweight & reactionupthrust & viscousityupthrust & reactionweight & viscousity3. Devices used to store energy in electrical circuits iscapacitorinductorresistordiode4. What is the resistance in the circuit that is connected to a 63 V battery, and is measured to have a current of 9 A.10 A63 Ω7 Ω657 Ω5. According to Kepler, a planet will travel fastest in its orbit when _____________.It is farthest from the sunIt is coldestIt is aligned with the other planetsIt is closest to the sun6. The figure above shows a uniform circular object centre R and diameter PS. A circular section, centre Q and diameter PR is cut away from it. If PQRS is a straight line, where is the centre of gravity of the figure?QRa point between P & Ra point between R & S7. A body falls from rest to the ground in 0.5 secs. Calculate the height from which it falls. (g = 10m/s²)1.25m0.5m0.125m1.0m5.0m8. Which of the following types of motion are oscillatory?I. a diving board when used by a diverII. the motion of the balance wheel of a wrist watchIII. the motion of turn-table of a record playerIV. the motion of the center of a coin as it rolls down on an inclined planeV. the motion of a needle of a d.c ammeter into which a low a.c current is passed.II, III & IV onlyI, II & III onlyI, II & V onlyIII, IV & V onlyI & II only9. Which of the following is a set of vectors?mass, weight and densityforce, mass and momentacceleration, moment and velocitymass, volume and density10. A force of 5N acts at a point Y on a rod XYZ as shown in the figure below. If XY is 2m, what is the moment of the force about point X?0Nm3Nm10Nm7Nm11. We can express electrical current in terms of charge carriersper kilogramper cubic meterper secondper square meter12. A wiring diagram would most likely be found in:A procedural flowchartAn advertisement for an electrical deviceThe service/repair manual for a radio receiverAn engineer’s general circuit idea notebook13. Which radiation has no electric charge associated with it?Gamma raysBeta raysAlpha raysAll of these14. 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 at point Xslope of the graph at point Yvalue of the velocity along the portion YZArea under the graph OXYZ15. A small trolley is set in motion on a horizontal surface by a force of 250N applied by means of a rope inclined at an angle of 20° to the horizontal. What horizontal force may be used instead?235N205N165.3N250N16. In a 30 minute interval, one kilowatt-hour of electrical energy is dissipated in a resistance of 20 ohms by a current of18 A20 A10 A14.1 A17. What's the Kelvin equivalent of the lowest possible temperature?0 K-273.15 K-459.15 KNothing, because there's no limit to how cold things can get18. You have an unlimited supply of 1-W, 1000-Ω resistors, and you need to get a 3000 Ω, 5 W resistance. The best way is toMake a 2 X 2 series-parallel matrixMake a 3 X 3 series-parallel matrixDo something other than any of the aboveConnect three of the resistors in parallel19. 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?2500mm1150mm8500mm6.67mm150000mm20. One of the following readings represents the measurement of the length of a metal rod using vernier callipers.5.165cm5cm5.0cm5.160cm5.16cm21. The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice-as-high apples, for the same mass, have1/2 the weight.1/4 the weight.Practically the same weight22. Which of the following pairs of units do not agree in dimension?Candela & microwattsMeters & feetMoles & coulombsMeters & light years23. When a ball rolls on a smooth level ground, the motion of its center istranslationaloscillatoryrandomrotational24. Which of the following statements is true of a body which is moving in a straight line with uniform acceleration?The velocity of the bodymust always be zero when the body stops acceleratingIs also uniformis the product of the distance travelled and timeis equal to the quotient of distance travelled and timewill increase with time in the direction of the acceleration25. A spiral spring, loaded with a piece of metal, extends by 10.5cm in air. When the metal is fully submerged in water, the spring extends by 6.8cm. Calculate the relative density of the metal. (Assume Hooke's law is obeyed)17.33.73.8410.526. When the distance between two stars decreases by half, the force between themIncreases to twice as much.Increases to four times as much.Decreases by one-half.Decreases by one-quarter.27. [ Physics ]One mega watt hour (MWH) is equal to3.6 × 10³ joule3.6 × 10ˆ7 joule3.6 × 10ˆ9 joule3.6 × 10ˆ4 joule28. The magnitude of the resultant of mutually perpendicular forces F_{1 }& F_{2 }is 13N. If the magnitude of F_{1 }is 5N, what is the magnitude of F_{2}12N18N8N2.6N29. What is current electricity?A charge that is built up then dispersedEnergy stored within an item, that it then releasedContinuous flow of electrons in a circuit30. Electric energy is produced by the________of charges.AmalgamationSeparationCessationcombination31. Two particles A and B starting from rest cover the same distance. The acceleration of A is twice that of B, the ratio of the time taken by A to that taken by B is√241/221/√232. According to Newton's Law of Universal Gravitation, which of the following do you NOT need to know in order to calculate the force of gravitational attraction between 2 objects?Mass of the larger objectDistance between the two objectsRadius of the larger objectMass of the smaller object33. 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 30,000N/m² 40,000N/m² 90,000N/m² 34. When a radioactive substance is placed in a cloud chamber, we can actually see the evidence that . . .The substance is not pure; it is a mixture.Radioactive decay releases tiny particles--individual atoms.One substance is changing into another substance.Radioactivity was discovered by humanity in the late-1800s.35. The helium nucleus here would be called:The parent nucleusThe daughter nucleusAn alpha particle36. Which of the following statements are true about the spring balance and the chemical balance?I. a change in gravity changes the reading of a spring balance but not that of a chemical balance.II. both are used to measure the mass of an object.III. either of them may be used to measure the weight of an object.IV. the spring balance works on the principle of Hooke's law while the chemical balance works on the principle of moments.III and IV onlynone of the aboveII and III onlyI and IV onlyall of the above37. Body floats in a fluid when it ________displaces its own volume of the liquid (fluid)is no longer subjected to gravitydisplaces its own density of the fluiddisplaces its own weight of the fluid38. In the circuit shown below, the capacitor C is first charged by throwing switch S to the left, then discharged by throwing switch S to the right. The time constant for discharge could be increased by which of the following?placing another resistor in parallel with the resistor RIncreasing the battery emf (voltage) εplacing another capacitor in series with Cplacing another capacitor in parallel with C39. A vector of magnitude 5 units in the north direction is combined with another vector to give zero resultant. The other vector is5 units in the west direction5 units in the south direction5 units in the east direction10 units in the north direction10 units in the south direction40. Phenomena in which a charged body attract uncharged body is calledelectric currentcharge movementelectrostatic inductionmagnetic induction41. Which of the following physical quantities is a scalar?Magnetic fluxGravitational field intensityElectric potentialMagnetic flux densityElectric field intensity42. Current in a series circuit Decreases at different pointsIncreases at different pointsIs the same at all pointsVaries43. 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 canThe remaining air inside the can condensed to form waterThe material used in making the can was very weakThe air pressure inside the can became less than the air pressure outside the can44. Pure elements can be transformed into entirely different elements. This statement at the present time isTrueFalse45. Two balls X & Y weighing 5g and 50kg respectively were thrown up vertically at the same time with a velocity of 100m/s. How will their positions be one second later?Y will be 95m ahead of XX and Y are 95m from the point of throwX and Y will both be 500m from the point of throwX will be 500m ahead of Y46. Suppose six resistors are hooked up in series, and each of them has a value of 540 Ω. Then the total resistance isnone of the above90 Ω540 Ω3.24 KΩ47. Imagine that we have access to a machine that collects energy over a period of time, and then converts all the energy into matter. We employ that machine to collect sunlight for a few weeks, and then push a button marked "Make Matter!"How can we calculate the mass of the resulting material sample in kilograms?divide the square of the speed of light in meters per second by the total collected energy in joulesdivide the total collected energy in joules by the square of the speed of light in meters per secondmultiply the total collected energy in joules by the square of the speed of light in meters per secondwe can'tdivide speed of light in meters per second by the total collected energy in joules48. What is the relationship between equipotential lines and lines of force.They are equidistantThey are parallel to each otherThe are perpendicular to each other49. A mango fruit drops from a branch 10m above the ground. Just before hitting the ground, its velocity is10√2m/s10m/s5√2m/s100m/s200m/s50. When a paint brush is removed from clean water, the bristles of the brush are pulled together because ofthe weight of the brush bristleslow density of waterthe mass of the brush bristlesthe viscousity of the surroundingsurface tension51. Which of the following quantities are scalar? I. electric potentialII. momentumIII. kinetic energyIV. torqueII, III & IV onlynone of the aboveII & III onlyI & III onlyall of the above52. The motion of a moving skin of a talking drum can rightly be described asrandomoscillatorytransitoryrotationaltranslational53. The density of a solid is defined as themass per unit volume of the solidweight per unit volume of the solidamount of water displaced when a unit mass of solid is immersed in itmass of the solid compared to the mass of an equal volume of watervolume per unit mass of the solid54. The stylus of a phonograph record exerts a force of 4 x 10^{-2}N/m^{2} on a groove of radius 10^{-2}m. Compute the pressure exerted by the stylus on the groove.127.32N/m²1.27N/m²1,273N/m²12.73N/m²55. If you replace a wire resistor with another of the same material and length but with three times the diameter, the resistance is now:3 times that of the original resistor1/3 that of the original resistor9 times that of the original resistor1/9 that of the original resistor56. Which switch rotates on a shaft?RotarySlideTogglePush Button57. Mechanical pumps cannotmove fluids in a horizontal directiondecrease the pressure in an enclosurecompress gases in a containerincrease the atmospheric pressuremove fluids in a vertical direction58. Which of the following physical quantities is not a vector?magnetic inductionelectric field intensityworkvelocityforce59. For which of the underlisted quantities is the derived unit ML^{2}T^{-2} correct?I. Moment of a forceII. WorkIII. AccelerationII OnlyI & IIII & IIII Only60. Which is the least possible error in using a rule graduated in cm?0.5cm1.0cm0.2cm2.0cm3.5cm61 out of 60Time is Up!