EASA Part 66 : Physics Question10

Question Number. 53. One radian is equal to.

Option A. the angle subtended at the centre of a circle when the arc-length formed between two radial lines is equal in length to the radius. Option B. 66.67 degrees. Option C. the angle subtended at the centre of a circle when the arc-length formed between two radial lines is equal to π. Correct Answer is. the angle subtended at the centre of a circle when the arc-length formed between two radial lines is equal in length to the radius.

Question Number. 55. Which of the following statements describes centrifugal force?. Option A. Equal to centripetal force and acts in the opposite direction. Option B. Greater than centripetal force and acts in the opposite direction. Option C. Smaller than centripetal force and acts in the

opposite direction. Correct Answer is. Greater than centripetal force and acts in the opposite direction. Explanation. Centrifugal is away from centre and equal (but opposite) to centripetal force.

Question Number. 43. The landing speed of an aircraft is 54 m/s2. If the maximum deceleration is 3m/s2 the minimum length of runway required is. Option A. 162m. Option B. 486m. Option C. 360m.

Correct Answer is. 486m. Explanation. NIL.

Question Number. 6. An aircraft flies 1350 nmiles in 2h 15mins. What is the average speed?. Option A. 600 nmiles/hour. Option B. 600 miles/hour. Option C. 150 nmiles/hour.

Correct Answer is. 600 nmiles/hour. Explanation. Average speed = distance/time = 1350/2.25 = 600 nm/h.

Question Number. 14. An aircraft of 2 metric tonnes uses 800 kilojoules kinetic energy to make an emergency stop. Its brakes apply a force of 10 kiloNewtons. What distance does it travel before it comes to a stop?. Option A. 40m. Option B. 800m. Option C. 80m.

Correct Answer is. 80m. Explanation. Energy = Force * Distance. 800,000J = 10,000N x Distance. Distance = ??.

Question Number. 20. What is the rate of gravity?. Option A. 12.7 m/s2. Option B. 0.981 m/s2. Option C. 9.81 m/s2.

Correct Answer is. 9.81 m/s2. Explanation. Gravity = 9.81 m/s2.

Question Number. 26. How long will it take a car moving at 60 km/hr to travel 90 km?. Option A. 40 minutes. Option B. 75 minutes. Option C. 90 minutes.

Correct Answer is. 90 minutes. Explanation. km = 1.5 * 60, therefore at 60 km/h it will take 1.5 hours = 90 mins.

Question Number. 9. What is the period of a frequency of 4 Hz?. Option A. 8 seconds. Option B. 0.25 seconds. Option C. 4 seconds.

Correct Answer is. 0.25 seconds. Explanation. Period = 1/f.

Question Number. 51. An aircraft weighing 6400 pounds lands at a speed of 10 ft/Sec and stops in 10 Seconds. What force was generated by the brakes (assuming gravity as 32 ft/sec). Option A. -2000 Lbs. Option B. -200 Lbs. Option C. -640 Lbs.

Correct Answer is. -200 Lbs.

Question Number. 19. A body dropped from 10 m will hit the ground in. Option A. 2 seconds. Option B. 0.2 seconds. Option C. 1.41 second.

Correct Answer is. 1.41 second. Explanation. s = ut + 1/2at2. Take s = 10, u = 0, a = g = 10. Calculate t. (Remember that 0 * t = 0).

Question Number. 17. A mass on a spring nearly hits the ground 20 times a minute, its frequency is. Option A. 3 cycles per second. Option B. 1/3 cycle per second. Option C. 20 cycles per second.

Correct Answer is. 1/3 cycle per second. Explanation. cycles per minute = 20/60 cycles per second = 2/6 = 1/3 cycle per second.

Question Number. 54. A weight on a spring almost touches the floor 7 times over 21 seconds. What is its frequency?. Option A. 3 cycles/second. Option B. 1/3 cycles/second. Option C. 7 cycles/second.

Correct Answer is. 1/3 cycles/second. Explanation. Frequency = number of oscillations divided by time = 7/21 = 1/3.

Question Number. 36. What force is required to produce an acceleration of 5 m/s2 on a mass of 2 kg?. Option A. 2.5 N. Option B. 10 N. Option C. 50 N.

Correct Answer is. 10 N. Explanation. F = ma = 2 * 5 = 10 Newtons (Force is measured in Newtons).

Question Number. 8. A cyclist goes from rest to 50 m/s in 5 seconds. What is the average acceleration?. Option A. 10 m/s2. Option B. 12 m/s2. Option C. 8 m/s2.

Correct Answer is. 10 m/s2. Explanation. Acceleration = change in speed / time.

Question Number. 24. A spaceship travels a distance of 480,000 miles in 2 days. What is its speed?. Option A. 48,000 mph. Option B. 36,000 mph. Option C. 10,000 mph.

Correct Answer is. 10,000 mph. Explanation. 480,000/48 = 10,000 MPH.

Question Number. 2. A time period of 10 microseconds is equal to a frequency of. Option A. 100 kHz. Option B. 10 kHz. Option C. 1 Mhz.

Correct Answer is. 100 kHz. Explanation. Frequency = 1/time period. 1/0.00001 = 100,000 = 100 kHz.

Question Number. 22. 100 m is approximately. Option A. 220 yards. Option B. 109 yards. Option C. 66 yards.

Correct Answer is. 109 yards. Explanation. m = 3.3 ft. 100 m = 330 ft. 3 ft = 1 yd so 330/3 = 110 yards.

Question Number. 12. What is the angular velocity of a shaft rotating at 300rpm in radians/second?. Option A. 10π radians/second. Option B. 2π radians/second. Option C. 5π radians/second.

Correct Answer is. 10π radians/second. Explanation. velocity = 2π(RPM)/60 = 2π * 300/60 = 10π radians/second.

Question Number. 25. A cyclist covers a distance of 1,000 m at a constant speed in 90 seconds, What is his speed?. Option A. 50 m/s. Option B. 12.5 m/s. Option C. 11.1 m/s.

Correct Answer is. 11.1 m/s. Explanation. 1000m/90secs = 11.1 m/s.

Question Number. 42. A light aircraft flies in a semi-circle from point A to point B. If the circle has a radius of 20km and the time taken is 30 minutes, the average speed is. Option A. 125.7 km/h. Option B. 110 km/h. Option C. 80 km/h.

Correct Answer is. 125.7 km/h. Explanation. arc distance = radius x angular distance (in rads) = 20π = 60 km (approx, taking πas 3). 60 km in 30 minutes is 120 km/h (answer is slightly more because π = 3.14, not 3.

Question Number. 16. A mass of 400 kg moves 27metres, with a force of 54N, what is the work produced?. Option A. 1458 J. Option B. 583.2 KJ. Option C. 10.1 KJ. .

Correct Answer is. 1458 J. Explanation. Work = Force x Distance = 54 * 27 = 1458 J. It is not moving under gravity so the 400 kg is a red herring

Question Number. 31. A car travelling at a speed of 5 m/s accelerates at the rate of 1 m/s2. How long will it take to reach a speed of 20 m/s?. Option A. 15 secs. Option B. 10 secs. Option C. 20 secs.

Correct Answer is. 15 secs. Explanation. The car gains 1 m/s every second, so to add 15 m/s it will take 15 seconds.

Question Number. 45. The angular velocity of 500 RPM is, in rads/seconds is equal to. Option A. 1000π rads/s. Option B. 8.33π rads/s. Option C. 16.66π rads/s.

Correct Answer is. 16.66π rads/s. Explanation. 500 * 2π/60 = 1000π/60 = 100π/6 = 16.66.

Question Number. 30. What acceleration is produced if a mass increases speed from rest to 10 ft/sec in 5 seconds?. Option A. 2 ft/sec2. Option B. 50 ft/sec2. Option C. 0.5 ft/sec2.

Correct Answer is. 2 ft/sec2. Explanation. v = u + at' where u = 0, v = 10, t = 5, so a = v/t = 10/5 = 2.

Question Number. 18. A body travelling at 20 m/s accelerates to 36 m/s in 8 seconds, what is its acceleration?. Option A. 8 m/s2. Option B. 4 m/s2. Option C. 2 m/s2.

Correct Answer is. 2 m/s2. Explanation. V = u +at 36 = 20 + 8a 36-20 = 8a 16/8 = a.

Question Number. 21. An object travels 18 km in 1 minute 30 seconds. What is its average speed?. Option A. 200 m/s. Option B. 270 m/s. Option C. 100 ms.

Correct Answer is. 200 m/s. Explanation. Average speed = distance/time = 18000 metres / 90 seconds = 200 m/s.

Question Number. 11. A freely falling body, falling from a height of 2km, and assuming g = 10m/s2, will strike the ground in a time of. Option A. 400s. Option B. 80s. Option C. 20s.

Correct Answer is. 20s. Explanation. From the equations of motion s = ut + 1/2at2. If it starts at rest u (and hence ut) is zero. Use s = 2000 m, plug in the numbers and transpose for t.

Question Number. 15. A body rotating at an angular velocity of 5 radians/sec, with a radius of 5 metres has a speed of. Option A. 5π metres per second. Option B. 5 metres per second. Option C. 25 metres per second.

Correct Answer is. 25 metres per second. Explanation. velocity = Radius * Omega (Omega = radians/sec). V = 5 * 5 = 25 m/s.

Question Number. 27. An aircraft travels at 500 km/hr for 30 minutes at steady speed. How far does it move in that time?. Option A. 500 km. Option B. 1000 km. Option C. 250 km.

Correct Answer is. 250 km. Explanation. 500 km/h for 30 m/s = a distance of 250 km.

Question Number. 4. If a body starts at rest and reaches 84 m/s in 3 seconds, its acceleration is. Option A. 28 m/s2. Option B. 14 m/s2. Option C. 252 m/s2.

Correct Answer is. 28 m/s2. Explanation. Acceleration = change in speed / time.

Question Number. 48. A satellite requires 10 Joules to rotate half a revolution, which takes 30 seconds. What is the energy required for one day?. Option A. 14,400 J. Option B. 1,200 J. Option C. 28,800 J.

Correct Answer is. 28,800 J. Explanation. 10 Joules * 2revs/min * 60 mins * 24 hours.

Question Number. 41. A radar rotates 1 revolution each 30 seconds and uses 10J of energy each revolution. How many joules does it use in a day?. Option A. 28.8 kJ. Option B. 720 kJ. Option C. 7200 kJ.

Correct Answer is. 28.8 kJ. Explanation. =2 8 60 = 120 revs/hour = 120 8 24 = 2880 revs/day. 2880 8 10 = 28800 Joules = 28.8 kJ.

Question Number. 46. Which of Newton's laws relates to the formula: Force = mass * acceleration?. Option A. 1st. Option B. 2nd. Option C. 3rd.

Correct Answer is. 2nd. Explanation. Newton's Second Law F = ma.

Question Number. 7. A spring extends 7 cm to the ground and back again 20 times a minute. What is the period?. Option A. 7 cm. Option B. 3 seconds. Option C. 1/3 cycle.

Correct Answer is. 3 seconds. Explanation. Frequency = 20/60 = 1/3 Hz. Time period = 1/f = 3 seconds.

Question Number. 57. The oscillation produced by a pendulum 2500mm long has a periodic time of. Option A. 300 milliseconds. Option B. 3 seconds. Option C. 1.25 seconds.

Correct Answer is. 3 seconds. Explanation. T = 2xπ√L/g = √2.5/10 = 6 * √0.25 = 6 * 0.5 = 3.

Question Number. 23. A car moves over a distance of 5 miles at steady speed in 10 minutes. What is the speed?. Option A. 30 mph. Option B. 15 mph. Option C. 60 mph.

Correct Answer is. 30 mph. Explanation. in 10 mins, 10 miles in 20 mins, 15 miles in 30 mins, 30 miles in 1 hr.

Question Number. 1. For a car weighing 1000 N, what force would be required to accelerate the car to 3 ms-2. Option A. 3270 N. Option B. 305.8 N. Option C. 3000 N.

Correct Answer is. 305.8 N. Explanation. F = ma F = 1000/9.81 * 3 F = 305.8 N (The 'divide by' 9.81 is necessary to convert the 1000 N into a mass (in kg)).

Question Number. 37. If a force of 10 lbf produces an acceleration of 2.5 ft/sec2, on what mass is it acting?. Option A. 4 slugs. Option B. 4 lb. Option C. 25 slugs.

Correct Answer is. 4 slugs. Explanation. F = ma, 10 = m * 2.5, m = 10/2.5 = 4 slugs.

Question Number. 40. An aircraft of 2 metric tonnes lands with 400 kilojoules of energy, 10 kiloNewtons of force is applied at the brakes, how far does the aircraft take to stop?. Option A. 40 M. Option B. 400 M. Option C. 800 M.

Correct Answer is. 40 M. Explanation. Work done = Force * energy. Work required to convert all the kinetic energy = Force * distance. So Force * distance = 400,000 Joules. 10,000 N * distance = 400,000. Distance = 40 m.

Question Number. 58. A drive shaft has a speed 150π radians a second. What is the speed in RPM?. Option A. 4500. Option B. 9000. Option C. 1500.

Correct Answer is. 4500. Explanation. 150π * 60/2π = 4500

Question Number. 56. A body starting from rest accelerates at the rate of 20 metres per second squared. What is the distance covered until the body reaches a velocity of 50 metres per second?. Option A. 0.625 kilometres. Option B. 50 metres. Option C. 62.5 metres.

Correct Answer is. 62.5 metres. .

Question Number. 35. F = ma is an equation which expresses. Option A. Newton's 1st law. Option B. Newton's 2nd law. Option C. Newton's 3rd law.

Correct Answer is. Newton's 2nd law. Explanation. Newton's second law is F = ma (Force = mass * acceleration).

Question Number. 52. For every action there is an equal and opposite reaction.' This is known as. Option A. Newtons second law. Option B. Newtons third law. Option C. Newtons first law.

Correct Answer is. Newtons third law.

Question Number. 38. What is acceleration?. Option A. Rate of change of velocity. Option B. Rate of change of movement. Option C. Rate of change of position.

Correct Answer is. Rate of change of velocity. Explanation. Acceleration is rate of change of velocity.

Question Number. 28. Which of the following affect the velocity of an object?. Option A. Speed and direction. Option B. Speed and distance. Option C. Speed and mass.

Correct Answer is. Speed and direction. Explanation. Velocity is a vector (it has magnitude - speed, and direction).

Question Number. 33. Which of Newton's Laws apply most directly to an aircraft which is accelerating down a runway?. Option A. The 3rd law. Option B. The 2nd law. Option C. The 1st law.

Correct Answer is. The 2nd law. Explanation. Technically, all of Newton's laws apply but the word accelerating indicates they are looking for the second law - Force = mass x acceleration.

Question Number. 34. Which of Newton's Laws apply most directly to a car which is slowing down due to the braking action?. Option A. The 1st law. Option B. The 3rd law. Option C. The 2nd law.

Correct Answer is. The 2nd law. Explanation. The car is decelerating therefore it is obeying the second law - Force = mass * acceleration (but technically all three laws apply).

Question Number. 39. In a gear train the driver has 100 TPI and the driven has 50 TPI. Option A. The driven rotates twice as fast. Option B. The driver and driven rotate at the same speed. Option C. The driven rotates half as fast.

Correct Answer is. The driven rotates twice as fast. Explanation. smaller wheel rotates at the faster speed (of a ratio equal to their diameters).

Question Number. 10. A dot rotates around the circumference of a circle. If the vertical position of this dot is plotted on a graph with respect to time the result will be. Option A. a linear motion. Option B. a transverse waveform. Option C. a sinusoidal waveform.

Correct Answer is. a sinusoidal waveform. Explanation. This is why an AC generator produces a sine wave frequency.

Question Number. 32. Newton's laws of motion apply to. Option A. solid substances only. Option B. all substances irrespective of state. Option C. gases and liquids only.

Correct Answer is. all substances irrespective of state. Explanation. Newtons laws apply to solids, liquids and gases.

Question Number. 13. The force that acts on a body to cause it to rotate in a circular path is called the. Option A. centripetal force. Option B. centrifugal force. Option C. inertia force.

Correct Answer is. centripetal force. Explanation. Centripetal' force is the force pulling the rotating object towards the centre of rotation. 'Centrifugal' force is the equal and opposite reaction.

Question Number. 29. Acceleration involves. Option A. change in speed or direction of movement. Option B. change of position with time. Option C. steady speed over a fixed period of time.

Correct Answer is. change in speed or direction of movement. Explanation. Acceleration is a vector (it has magnitude as well as direction)

Question Number. 50. For an object in circular motion at constant velocity, if the radius of its path is doubled the centripetal force will. Option A. double. Option B. remain the same. Option C. half.

Correct Answer is. half.

Question Number. 49. The size of Centripetal Force on an object travelling in a circle. Option A. increase with increasing mass of the object. Option B. decreases with increasing speed of the object. Option C. increases with an increasing radius of circle.

Correct Answer is. increase with increasing mass of the object.

Question Number. 47. The period of simple pendulum is. Option A. independent of its mass. Option B. longer for a heavy pendulum bob. Option C. longer on the earth than on the moon.

Correct Answer is. independent of its mass. Explanation. The only things that affect the period of a pendulum is the length (greater length = longer period) and gravity (greater gravity= shorter period).

Question Number. 5. The SI unit of velocity is the. Option A. metre per second squared (m/s2). Option B. metre per second (m/s). Option C. metre (m).

Correct Answer is. metre per second (m/s).

Question Number. 3. The SI unit of acceleration is the. Option A. metre per second squared (m/s2). Option B. metre per second (m/s). Option C. square metre (m2).

Correct Answer is. metre per second squared (m/s2).

Question Number. 44. The number of radians in a semi circle are. Option A. exactly 3. Option B. π. Option C. 2π.

Correct Answer is. π. Explanation. full circle = 2π radians, so a semicircle = π radians = 3.142.