EASA Part 66 : Physics Question11
Question Number. 17. Two couples with magnitude F act against each other. The resultant will be. Option A. -2F. Option B. 2F. Option C. 0.
Correct Answer is. 0. Explanation. A 'couple' is 2 forces acting in the same rotational direction an equal distance from a pivot point (like turning a die holder). Two couples in opposition will cancel each other.
Question Number. 68. Assuming constant temperature. If a steel bar of length 2 m deforms to a length of 2.2 m under applied load. The strain is. Option A. 1.1. Option B. 0.9. Option C. 0.1.
Correct Answer is. 0.1. Explanation. Strain = Extension/Original Length = 0.2/2 = 0.1.
Question Number. 53. 1 Pascal equals. Option A. 105 N/m2. Option B. 1 N/m2. Option C. 10 Nm.
Correct Answer is. 1 N/m2. Explanation. 1 Pa = 1 N/m2.
Question Number. 5. 1 Newton is equal to. Option A. 1 kilogram meter per second per second. Option B. 1 kilogram of force. Option C. 1 joule per second.
Correct Answer is. 1 kilogram meter per second per second. Explanation. Remember Newtons 2nd law 'F=ma'. Well, 'm' is in kilograms, 'a' is in metres per second squared (or meters per second per second) so put the two together and 'F' is....
Question Number. 74. The conversion factor to convert litres to pints is. Option A. 0.57. Option B. 1.76. Option C. 2.2.
Correct Answer is. 1.76. Explanation. NIL. http://www.thetipsbank.com/convert.htm
Question Number. 78. The centre of gravity of a triangle is. Option A. 1/3 the median from the base. Option B. 1/3 the bisector from the base. Option C. 1/3 the height from the base.
Correct Answer is. 1/3 the median from the base. Explanation. http://en.wikipedia.org/wiki/Triangle
Question Number. 40. A force of 10 million Newton's is expressed numerically as. Option A. 10 MN. Option B. 10 MN. Option C. 1 MN.
Correct Answer is. 10 MN. Explanation. million Newtons = 10 MN (MegaNewtons).
Question Number. 24. What torque loading would you apply to a nut if the force is 50 lbs, exerted 2 feet from its axis?. Option A. 100 lbs.ft. Option B. 600 lbs.ft. Option C. 251 lbs.ft.
Correct Answer is. 100 lbs.ft. Explanation. Torque loading = force * distance.
Question Number. 21. What load can be lifted on jack B?. Option A. 300N. Option B. 200N. Option C. 100N.
Correct Answer is. 100N. Explanation. 10 times the area, then it can lift 10 times the load.
Question Number. 44. One atmosphere is equal to. Option A. 1.22 kg/m2. Option B. 14.7 lbf/in2. Option C. 28.9 inches of Hg.
Correct Answer is. 14.7 lbf/in2. Explanation. atmosphere = 14.7 pounds-force (lbf) per square inch.
Question Number. 72. A force of 5 Newtons acting perpendicularly at 300 centimetres from the pivot produces a moment of. Option A. 1500 Newton metre. Option B. 15 Newton metre. Option C. 1.5 Kilonewton millimetre.
Correct Answer is. 15 Newton metre. Explanation. 3m * 5N = 15 Nm.
Question Number. 31. If 1500 psi hydraulic pressure is pumped into an accumulator, with a pre-charge air pressure of 1000 psi the gauge will read. Option A. 2500 psi. Option B. 1500 psi. Option C. 1000 psi.
Correct Answer is. 1500 psi. Explanation. The accumulator pressure gauge reads the hydraulic pressure only when it is above the charge pressure.
Question Number. 34. A mass of 10kg placed 2 metres away from a pivot will have a moment of. Option A. 196 NM. Option B. 50 NM. Option C. 20 NM.
Correct Answer is. 196 NM. Explanation. 10 kg = 10 * 9.8 = 98N. Moment = force * radius = 98 * 2 = 196 Nm.
Question Number. 55. Two items weighing 11kg and 8kg are placed 2m and 1m respectively aft of the C of G of an aircraft. How far forward of the C of G must a weight of 30kg be placed so as not to change the C of G?. Option A. 2m. Option B. 1.5m. Option C. 1m.
Correct Answer is. 1m. Explanation. Total moment = (11*2) + (8*1) = 30kgm. The 30 kg mass must be placed such that 30kg * Xm = 30 kg m. Hence X = 1m.
Question Number. 64. A moment is created by a force of 5N acting 4m from the pivot on a uniform bar. At what distance must a force of 10N be applied to balance the beam?. Option A. 8 m. Option B. 4 m. Option C. 2 m.
Correct Answer is. 2 m. Explanation. 5 * 4 = 20, 10 * X = 20 X = 2m.
Question Number. 2. The centre of gravity of an aircraft is adjusted by two weights, 10 kg and 5 ckg plaed 4m and 2 m aft of the c of g. To what position must a 20 kg weight be added to balance the c of g?. Option A. 2.5m. Option B. 4m. Option C. 2m.
Correct Answer is. 2.5m. Explanation. (10 * 4) + (5 * 2) = 20 x ? 40+10=20 x ? ? = 2.5m.
Question Number. 49. A force 10 N is placed 2 Meters from a pivot point, what is the moment?. Option A. 20 Nm. Option B. 20 Nm. Option C. 80 Nm.
Correct Answer is. 20 Nm. Explanation. N at 2 m distance produces 10 * 2 = 20 Nm.
Question Number. 42. If a square has an area of 9m2, one side is. Option A. 3 m. Option B. 3 m2. Option C. 3 sq. m.
Correct Answer is. 3 m. Explanation. 3 m * 3m = 9 m2.
Question Number. 70. A hydraulic piston of 2.5 square inches produces 7500lbf, What pressure is used?. Option A. 5000 PSI. Option B. 3000 PSI. Option C. 7000 PSI.
Correct Answer is. 3000 PSI. Explanation. Pressure = Force/Area.
Question Number. 36. 1000 lb/in2 is in an accumulator. If 3000 lb/in2 of hydraulic fluid is pumped in, what is the pressure on the air side?. Option A. 3000 lb/in2. Option B. 4000 lb/in2. Option C. 1000 lb/in2.
Correct Answer is. 3000 lb/in2. Explanation. The piston does not move until the hydraulic pressure exceeds 1000 psi. From then on, the air and hydraulic pressures are equal (at all times that the piston is off its stops).
Question Number. 79. A lifting machine moves with an effort, a distance of 200 cm, in order to raise it 0.5 m. The Velocity Ratio is. Option A. 0.25. Option B. 4. Option C. 40.
Correct Answer is. 4. Explanation. Distance ratio input/ output = 2/0.5 = 4. Velocity ratio is same as Distance ration.
Question Number. 30. The specific torque loading for a bolt is 50 lbs.ins but an extension of 2 inches is needed to reach the bolt in addition to the 8 inches torque wrench. What will the actual reading?. Option A. 54 lb.ins. Option B. 40 lb.ins. Option C. 60 lb.ins.
Correct Answer is. 40 lb.ins. Explanation. New torque reading = desired torque x L/(x+L). 50 * 8/10 = 40 lb.ins.
Question Number. 57. A load of 600N is suspended by a cable. If the stress in the cable is said to be limited to 15N/mm2 the minimum cross sectional area of the cable must be. Option A. 0.025mm2. Option B. 9000mm2. Option C. 40mm2.
Correct Answer is. 40mm2. Explanation. Stress = Force/Area. Area = Force/Stress = 600/15 = 40mm2.
Question Number. 33. A cylinder filled with water to half a metre will exert a pressure of. Option A. 4.9 Pa. Option B. 4900 Pa. Option C. 49 Pa.
Correct Answer is. 4900 Pa. Explanation. Pressure = density * gravity * height = 1000 (for water) * 10 * 0.5 = 5000 Pa. Answer is 4900 Pa because gravity is slightly less than 10 (9.81 to be exact).
Question Number. 80. Two Vectors are at 90 degrees to each other having magnitudes of 3N and 4N. The resultant is. Option A. 5N. Option B. 1N. Option C. 7N.
Correct Answer is. 5N. Explanation. Vectors make a 3-4-5 triangle.
Question Number. 65. A lever of length 105 cm is used with a fulcrum placed 15 cm from the end bearing the load. Its mechanical advantage is. Option A. 1/6. Option B. 7. Option C. 6.
Correct Answer is. 6. Explanation. The TOTAL length is 105 cm, so the input end is 90 cms. 90/15 = 6.
Question Number. 35. 25 litres of fuel exerts a pressure of 10KPa. If a further 125 litres is added, the pressure will now be. Option A. 50 kPa. Option B. 60 kPa. Option C. 40 kPa.
Correct Answer is. 60 kPa. Explanation. Total Fuel = 150 litres = 6 * 25. 6 * original pressure = 60 kPa.
Question Number. 19. A vessel has 25 ml of water which produces 10 kPa. If another 125 ml of water is added, what will be the pressure in the vessel?. Option A. 40 kPa. Option B. 50 kPa. Option C. 60 kPa.
Correct Answer is. 60 kPa. Explanation. pressure = density * gravity * height. 25ml + 125ml = 150ml or 6 times. So 6 * height = 6 * pressure.
Question Number. 39. How much force is exerted by piston if it is subjected to a pressure of 3000 Pa and has surface area of 2.5 m2?. Option A. 7500 N. Option B. 3000 N. Option C. 1200 N.
Correct Answer is. 7500 N. Explanation. Force = pressure * area = 3000 * 2.5 = 7.5 N.
Question Number. 58. A spring, operating within its elastic range, shortens by 60mm when a load of 480N is applied to it. Calculate the total shortening when the load is increased by 120N. Option A. 82mm. Option B. 45mm. Option C. 75mm.
Correct Answer is. 75mm. Explanation. 600/480 * 60 = 75mm.
Question Number. 18. The height of mercury required to give 1 bar is. Option A. 700 mm. Option B. 1000 mm. Option C. 760 mm.
Correct Answer is. 760 mm. Explanation. 1 bar is almost atmospheric pressure
Question Number. 4. The quadrature component of a vector is. Option A. 45° to the original. Option B. 90° to the original. Option C. 180° to the original.
Correct Answer is. 90° to the original. Explanation. NIL.
Question Number. 47. When you overstress a steel bar, what is the point called where it does not return to its original form?. Option A. Plastic limit. Option B. Elasticity limit. Option C. Deformation limit.
Correct Answer is. Elasticity limit. Explanation. The point at which the stressed bar does not return to its original form is called the 'elastic limit'.
Question Number. 45. Strain is calculated by. Option A. Original Length * Extension. Option B. Extension ÷ Original Length. Option C. Original Length ÷ Extension.
Correct Answer is. Extension ÷ Original Length. Explanation. Strain = change in length divided by original length.
Question Number. 51. What atmospheric conditions will cause the true landing speed of an aircraft to be highest?. Option A. Low temp, high humidity. Option B. Head wind, low humidity. Option C. High temp, high humidity.
Correct Answer is. High temp, high humidity. Explanation. Lift is least at low density. Density is lowest at high temperature and high humidity.
Question Number. 15. The extension of a spring can be determined using. Option A. Charles' Law. Option B. Newton's 2nd Law. Option C. Hooke's Law.
Correct Answer is. Hooke's Law. Explanation. Hooke's law is 'extension is proportional to force
Question Number. 10. The SI unit of force is the. Option A. Newton (N). Option B. Metre (m). Option C. Pascal (Pa).
Correct Answer is. Newton (N). Explanation. NIL.
Question Number. 61. A quantity which has size but no direction is called a. Option A. Scalar. Option B. Moment. Option C. Vector.
Correct Answer is. Scalar. Explanation. scalar has size only (mass, area etc.). A vector has size and direction (velocity, force etc.).
Question Number. 60. When a square block of material is pushed into a parallelogram, the material is under what stress type?. Option A. Compression. Option B. Torsion. Option C. Shear.
Correct Answer is. Shear. Explanation. NIL. http://groups.physics.umn.edu/demo/old_page/demo_gifs/1R30_20.GIF
Question Number. 81. Which of the following has no units?. Option A. Strain. Option B. Stress. Option C. Elasticity.
Correct Answer is. Strain.
Question Number. 46. When a twisting force is applied to a bolt, what stress is exerted on to the head?. Option A. Shear. Option B. Compressive. Option C. Torsion.
Correct Answer is. Torsion. Explanation. A twisting force applied to a bolt produces 'torsion stress' (which technically is a form of shear)
Question Number. 16. When a steel bar is overstressed, what is the name of the point at which it does not return to its original form after the load is released?. Option A. Ultimate point. Option B. Yield point. Option C. Young's modulus.
Correct Answer is. Yield point.
Question Number. 37. A fractional decrease in volume of a material when it is compressed is a function of the. Option A. compressive strain. Option B. compressive strain. Option C. bulk modulus.
Correct Answer is. bulk modulus. Explanation. Bulk modulus = ratio of change in pressure to the fractional volume compression.
Question Number. 56. A point at which the total force of a body acts is known as the. Option A. centre of gravity. Option B. point of equilibrium. Option C. centre of mass.
Correct Answer is. centre of gravity. Explanation. If by force they mean 'weight' then it is Centre of Gravity.
Question Number. 75. Hydraulic pressure can be restored by. Option A. the use of pressure/heat exchange. Option B. compressing the air charge in an accumulator. Option C. compressing the fluid in a reservoir.
Correct Answer is. compressing the air charge in an accumulator.
Question Number. 71. Forces passing through a common point are said to be. Option A. coherent. Option B. coplanar. Option C. concurrent.
Correct Answer is. concurrent.
Question Number. 20. Two hydraulic jacks with different diameters have the same fluid pressures entering at the same rate. They will extend at. Option A. the same rate until the smaller jack becomes full. Option B. the same rate. Option C. different rates.
Correct Answer is. different rates. Explanation. diameter will have the greater force. The 'trade-off' for this is that it will move slower.
Question Number. 23. The difference between two pressures is. Option A. vacuum pressure. Option B. differential pressure. Option C. static pressure.
Correct Answer is. differential pressure. Explanation. Differential pressure is the difference between two pressures (such as inside and outside the aircraft cabin).
Question Number. 38. A ram has a piston with 2 in2. Another ram with a piston of 4 in2 will provide. Option A. the same force. Option B. double the force. Option C. square the force.
Correct Answer is. double the force. Explanation. Double the area = double the force. (However, if the question said double the radius or diameter, the force is a square of that, i.e 4x).
Question Number. 73. Equilibrium of translation occurs when. Option A. downward forces equal upward (reactive) forces. Option B. clockwise moments equal counterclockwise moments. Option C. clockwise forces and counterclockwise forces are equal.
Correct Answer is. downward forces equal upward (reactive) forces. Explanation. Translation is linear movement.
Question Number. 12. Stress is given by. Option A. force per unit area. Option B. extension per original length. Option C. force per original length.
Correct Answer is. force per unit area. Explanation. NIL.
Question Number. 48. The formula for calculating shear is. Option A. force ÷ cross-sectional area. Option B. force * area. Option C. force ÷ area parallel to the force.
Correct Answer is. force ÷ area parallel to the force. Explanation. Formula for shear (stress) is Shear stress = force/area parallel to force.
Question Number. 6. The SI unit of mass is the. Option A. metre (m). Option B. pound (lb). Option C. kilogram (kg).
Correct Answer is. kilogram (kg). Explanation. NIL.
Question Number. 11. The formula for calculating stress is. Option A. load divided by cross sectional area. Option B. area divided by load. Option C. load multiplied by cross sectional area.
Correct Answer is. load divided by cross sectional area. Explanation. NIL.
Question Number. 69. A Scalar quantity has. Option A. sense, magnitude and direction. Option B. sense and direction. Option C. magnitude only.
Correct Answer is. magnitude only.
Question Number. 7. A slug is a unit of. Option A. speed. Option B. mass. Option C. weight.
Correct Answer is. mass. Explanation. A very old unit of mass - equal to 14.6 kg.
Question Number. 62. The advantage of using a machine is. Option A. mechanical advantage of input. Option B. mechanical advantage of output. Option C. input work is less than the output work.
Correct Answer is. mechanical advantage of output. Explanation. Mechanical advantage is usually on the outp.
Question Number. 59. The c.g. of a triangular plate is at the intersection of. Option A. medians from a vertex to the opposite side. Option B. angle bisectors. Option C. perpendicular bisectors.
Correct Answer is. medians from a vertex to the opposite side.
Question Number. 77. One kg is the mass of. Option A. one litre of pure water. Option B. one pint of pure water. Option C. one gallon of pure water.
Correct Answer is. one litre of pure water. Explanation. NIL. http://www.bartleby.com/68/85/3685.html
Question Number. 41. A millilitre is equal to. Option A. one million litres. Option B. one millionth of a litre. Option C. one thousandth of a litre.
Correct Answer is. one thousandth of a litre. Explanation. A millilitre = 1/1000 litre.
Question Number. 67. The yield point of a material is the point at which. Option A. strain becomes proportional to stress. Option B. the material ruptures or breaks. Option C. permanent deformation takes place.
Correct Answer is. permanent deformation takes place. Explanation. NIL.
Question Number. 43. A vector quantity is a quantity which. Option A. possesses sense, magnitude and direction. Option B. possesses direction only. Option C. possesses sense only.
Correct Answer is. possesses sense, magnitude and direction. Explanation. A vector quantity has magnitude AND direction. (sense and direction are the same thing).
Question Number. 22. The most common method of expressing pressure is in. Option A. inch pounds per square inch. Option B. grams per square inch. Option C. pounds per square inch.
Correct Answer is. pounds per square inch. Explanation. Pressure is usually measured in Pounds per Square Inch (PSI).
Question Number. 29. If the hydraulic system accumulator has a low air pressure, it will cause. Option A. rapid pressure fluctuations during operation of services. Option B. rapid movement of the operating jacks. Option C. slow build up of pressure in the system.
Correct Answer is. rapid pressure fluctuations during operation of services. Explanation. The secondary purpose of an accumulator is to damp out pressure fluctuations.
Question Number. 8. If an object in air is submerged in a liquid or a gas its weight will. Option A. increase. Option B. decrease. Option C. remain the same.
Correct Answer is. remain the same. Explanation. thing that can change the weight of an object is the gravitational field it is in.
Question Number. 54. The addition of 2 different vectors to produce another vector is called. Option A. component. Option B. resolution. Option C. resultant.
Correct Answer is. resultant. Explanation. The resultant of two vectors. The mathematical process is actually called 'composition'.
Question Number. 14. A force perpendicular to a beam produces what type of stress?. Option A. compressive. Option B. shear. Option C. tensile.
Correct Answer is. shear. Explanation. perpendicular to a beam (such a s a man on a diving board) produces bending and shear stress.
Question Number. 76. When checking a hydraulic accumulator initial air pressure, the hydraulic system pressure. Option A. should be at the normal working pressure. Option B. is not important. Option C. should be released.
Correct Answer is. should be released.
Question Number. 28. The purpose of an accumulator in a hydraulic system is to. Option A. collect air from the hydraulic fluid, thus reducing the requirement for frequent bleeding. Option B. relieve excess pressure. Option C. store hydraulic fluid under pressure.
Correct Answer is. store hydraulic fluid under pressure. Explanation. An accumulator stores hydraulic pressure for use when the main pressure pump fails.
Question Number. 9. If a material is loaded excessively and is permanently deformed, it is said to be. Option A. stretched. Option B. stressed. Option C. strained.
Correct Answer is. strained. Explanation. Strain = extension / original length (Stress = force / area).
Question Number. 32. Young's modulus is. Option A. stress * strain. Option B. strain / stress. Option C. stress / strain.
Correct Answer is. stress / strain. Explanation. Young's Modulus (E) is the ratio Stress / Strain.
Question Number. 50. If a tensile load is placed on a bar, it will. Option A. bend. Option B. crush. Option C. stretch.
Correct Answer is. stretch. Explanation. tensile load placed on a bar will stretch it.
Question Number. 52. Structures designed to withstand compression are called a. Option A. tie. Option B. strut. Option C. beam.
Correct Answer is. strut. Explanation. Tension - Tie, Compression - Strut, Bending - Beam.
Question Number. 66. The stress created when a material is pulled apart is called. Option A. tension. Option B. torsion. Option C. compression.
Correct Answer is. tension.
Question Number. 3. For the CGS system, the force is. Option A. the 'N' which produces an acceration of 1 cm/s2 for a mass of gram. Option B. the 'dyne' which produces an acceleration of 1cm/s2 for a mass of gram. Option C. the 'pd1' which produces an acceleration of 1 cm/s2 for a mass of gram.
Correct Answer is. the 'dyne' which produces an acceleration of 1cm/ s2 for a mass of gram. Explanation. NIL.
Question Number. 25. In a jack with a ram only on one side and hydraulic fluid applied from both sides. Option A. a condition of hydraulic lock exists and no movement will take place. Option B. the ram will move opposite to the side where the ram is due to pressure acting on differential areas. Option C. the ram will move to the side where the ram is, due to pressure acting on differential areas.
Correct Answer is. the ram will move opposite to the side where the ram is due to pressure acting on differential areas. Explanation. The non-ram side has a greater area, so the ram will be pushed from that side to the ram side.
Question Number. 27. A pressure of 100 PSI acts on two jacks in a hydraulic system, having piston areas 2 sq in and 4 sq in. Option A. the smaller jack will exert a force of 50 lb and the larger a force of 25 lb. Option B. the smaller jack will exert a force of 200 lb and the larger a force of 400 lb. Option C. the two jacks will exert the same force.
Correct Answer is. the smaller jack will exert a force of 200 lb and the larger a force of 400 lb. Explanation. Force = pressure * area. 100 * 2 = 200 lbs. 100 * 4 = 400 lbs.
Question Number. 1. An insulator has its electrons. Option A. tightly bound. Option B. loosely bound. Option C. otally free from the atoms.
Correct Answer is. tightly bound. Explanation. Aircraft Electricity & Electronics 5th edition TK Eismin.
Question Number. 13. The force which opposes twisting deformation is. Option A. torsion. Option B. strain. Option C. shear.
Correct Answer is. torsion. Explanation. A torsional force opposes twisting.
Question Number. 26. Using the same hydraulic pressure, the force applied by a hydraulic jack of 4 sq. inch piston area. Option A. will be half that applied by a similar jack of 2 sq. inch piston area. Option B. will be equal to that applied by a similar jack of 2 sq. inch piston area. Option C. will be twice that applied by a similar jack of 2 sq. inch piston area.
Correct Answer is. will be equal to that applied by a similar jack of 2 sq. inch piston area. Explanation. Force = pressure * area.
Question Number. 63. Which of the following can transmit pressure?. Option A. Liquids and gases. Option B. Solids and gases. Option C. Any matter can transmit pressure, depending on
temperature. Correct Answer is. Liquids and gases.
