Danh sách câu hỏi

Câu 1: The smallest part of an element is:

a) A compound
b) An atom
c) A molecule

Câu 2: A positive ion:

a) Has extra electrons
b) Has number of protons difference with number of neutrons
c) Has missing electrons

Câu 3: The nucleus of an atom contains:

a) Protons and electrons
b) Protons and neutrons
c) Electrons and neutrons

Câu 4: The atomic mass number is the number of.

a) Protons plus electrons
b) Neutrons plus electrons
c) Protons plus neutrons

Câu 5: Which statement is the best correct?

a) Each vector consists of Direction
b) Each vector consists of Intensity
c) Each vector consists of Direction and intensity

Câu 6: In physics, which below scalars have no direction?

a) Mass, time, force
b) Mass, temperature, force
c) Mass, time and temperature

Câu 7: Two forces work on an object on the same time, when the result should be calculated, you need:

a) Angle of vector only
b) Length of vector only
c) Angle and length of vector

Câu 8: The center of gravity is depend on:

a) The form of a body
b) The mass of a body
c) The density of a body

Câu 9: Stress is show as:

a) Ratio of body Weight to Area of applied Force
b) Ratio of External Force to Area of applied Force
c) Ratio of External Force to Area of body Surface

Câu 10: When a hammer has contacted Area 0.01m² applying a Force 10 Newton applying to a table, how many Stress acts on the table?

a) 100 Pa
b) 1000 daN
c) 1000 Pa

Câu 11: Basic structural stresses to aircraft are:

a) Tension, compression, torsion
b) Shear, bending, tension
c) Tension, compression, torsion, shear and bending

Câu 12: Which statement is the best correct?

a) Unit for tensile stress is Lb/in²
b) Unit for tensile stress is N/m
c) Units for tensile stress are: Lb/in² or N/m²

Câu 13: Calculate compression stress on cross section Area 0.5m² with Force perpendicular to area 150N.

a) 75N/m²
b) 300N/m²
c) 300N.m

Câu 14: Which is the Force required on wrench handle with length 10 in to produce a torque of 300 in.lbf?

a) 30 lbf
b) 3000 lbf
c) 300 lb

Câu 15: Which is the Force required on torque wrench handle with length 15 in and extension with length 5 in to produce a torque of 300 in.lbf?

a) 25 lbf
b) 20 lbf
c) 15 lb

Câu 16: All matters exists in which states?

a) Solid, Liquid or Gas
b) Liquid or Gas
c) Solid, Liquid or Lava

Câu 17: When 5 MPa (725 psi) of fluid pressure is supplied to a cylinder with a piston area of 10 cm2, how many Force is generated?

a) 7250 N
b) 5000 N
c) 2000 N

Câu 18: A cylinder has a piston surface area 4 in² on the side without rod. When 1,000 psi of pressure is applied. How many force is produced?

a) 4000 lbs
b) 400 lbs
c) 4000 N

Câu 19: A cylinder has a piston surface area 4 in² on the side with rod, rod area 1 in².When 1,000 psi of pressure is applied. How many force is produced?

a) 4000 lbs
b) 3000 lbs
c) 3000 N

Câu 20: A block of wood of volume 2 ft³ in ocean water, density of ocean water is 64.4 lb/ft³. Find the Buoyancy Force acts on this block.

a) 32.2 lb.ft
b) 32.2 lb
c) 128.8 lb

Câu 21: An aircraft flies 1350 nmiles in 2h 15mins. What is the average speed?

a) 600 nmiles/hour
b) 400 nmiles/hour
c) 150 nmiles/hour

Câu 22: An aircraft travels at 500 km/hr for 30 minutes at steady speed. How far does it move in that time?

a) 500 km
b) 1000 km
c) 250 km

Câu 23: What is acceleration?

a) Rate of change of velocity
b) Rate of change of movement
c) Rate of change of position

Câu 24: 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?

a) 15 secs
b) 10 secs
c) 20 secs

Câu 25: A cyclist goes from rest to 50 m/s in 5 seconds. What is the average acceleration?

a) 10 m/s²
b) 12 m/s²
c) 14 m/s²

Câu 26: A body travelling at 20 m/s accelerates to 36 m/s in 8 seconds, what is its acceleration?

a) 8 m/s²
b) 4 m/s²
c) 2 m/s²

Câu 27: For the acceleration caused by the earth’s gravity, standard gravity is defined as follows:

a) G = 9,01 m/s²
b) G = 9,81 m/s²
c) G = 8,91 m/s²

Câu 28: A ball is dropped from rest. What is its speed after 4 seconds?

a) Approximate 80 m/s
b) Approximate 40 m/s
c) Approximate 60 m/s

Câu 29: A body started from rest and has been falling freely for 3 seconds. At what speed is it falling?

a) Approximate v = 19 m/s
b) Approximate v = 29 m/s
c) Approximate v = 39 m/s

Câu 30: Which statement is the best correct?

a) When things fall to earth, terminal velocity of things depend on: Mass, drag and height of things
b) When things fall to earth, terminal velocity of things depend on: Mass and height of things
c) When things fall to earth, terminal velocity of things depend on:Mass and drag of things

Câu 31: The centrifugal force is caused by:

a) The inertia of a rotating body
b) The inertia of a straight line moving body
c) The inertia of a linear moving body

Câu 32: For circular motion, centripetal force can be calculated by:

a) (Mass x Velocity)/Radius
b) (Mass x Velocity²)/Radius
c) (Mass x Velocity²)/Diameter

Câu 33: For circular motion, with tangential velocity = 10m/s, mass = 5kg, radius = 0.1m, the centrifugal force is:

a) 5N
b) 15N
c) 0.5N

Câu 34: Which frequencies must aircraft designers take into account when designing

aircraft structure?
a) Vibration frequencies
b) Resonant frequencies
c) Harmonic frequencies

Câu 35: What are purposes of gear in clocks and watches, in automobiles and aircraft?

a) Used to gain mechanical advantage
b) Used to change the direction of movement
c) Used to gain mechanical advantage, or to change the direction of movement.

Câu 36: The actual mechanical advantage (AMA) is:

a) The ratio of the output force to the input force
b) The ratio of the input force to the output force
c) The subtraction of the output force to the input force

Câu 37: A worker is able to raise a body weighing 150 N by applying a force of 75 N. What is the AMA of the machine that he is using?

a) 3
b) 2
c) 4

Câu 38: The mass of an object is described as:

a) The amount of matter in an object
b) Is constant regardless of its location
c) The amount of matter in an object and is constant regardless of its location

Câu 39: Acceleration of Gravity on earth is:

a) 9.8 m/s²
b) 32.2 ft/s²
c) 9.8 m/s² or 32.2 ft/s²

Câu 40: US pounds equal:

a) 0.4536 kg
b) 0.4536 g
c) 4.536 kg

Câu 41: Which below statement is correct?

a) The jet has a greater mass, it has a greater resistance to change its state of rest to motion.
b) The jet has a greater mass, it has the same resistance to change its state of rest to motion.
c) The jet has a greater mass, it has a less resistance to change its state of rest to motion.

Câu 42: Weight is defined as:

a) The gravitational push of the earth on a given body
b) The gravitational pull of the earth on a given body
c) The gravitational pull of the earth on a given surface

Câu 43: A body has a mass of 50 kg, how weight is it? Gravity is 9.81

a) 490.5 N.m
b) 490.5 N
c) 490.5 Lbs

Câu 44: A force 15 daN equals:

a) 1500 N
b) 150N
c) 1,5N

Câu 45: How many kinds of friction?

a) There are 3 kinds: starting friction, sliding friction and rolling resistance
b) There are 2 kinds: starting friction and rolling resistance
c) There are 3 kinds: starting friction, linear friction and rolling resistance

Câu 46: The friction formula is:

a) Friction = (Coefficient of Friction) x Mass
b) Friction = (Coefficient of Friction) x Weight
c) Friction = (Coefficient of Friction) x Acceleration

Câu 47: A steel body weighing 450 N is resting on a horizontal steel surface. How many newtons of force are necessary to start the body sliding? Know that the Coefficient of starting friction is 0.15

a) 60 N
b) 86 N
c) 68N

Câu 48: A steel body weighing 450 N is resting on a horizontal steel surface. What force is necessary to keep this body sliding at constant speed? Know that the Coefficient of sliding friction is 0.09

a) 41 N
b) 45 N
c) 55 N

Câu 49: Unit of Work is Joules, 1 Joule is equal:

a) Kg.m
b) Kg.m/s
c) N.m

Câu 50: What is the Unit of Work?

a) Joule (J)
b) Watt (W)
c) Newton (N)

Câu 51: Calculate the work done by a man of mass 30 kg in climbing a ladder 2 m high (acceleration of gravity is 9.81 m/s²)

a) 588.6 Joules
b) 588.6 Newtons
c) 588.6 Watts

Câu 52: Calculate the work done by a man of mass 65 kg in climbing a ladder 4 m high (acceleration of gravity is 9.81 m/s²)

a) 3,548 Joules
b) 2,550.6 Joules
c) 2,348 Joules

Câu 53: What is the Unit of Power?

a) Joule (J)
b) Watt (W)
c) Newton (N)

Câu 54: 10 Watts is equal:

a) 10 J/s
b) 10 N/s
c) 10 kg/s

Câu 55: How many Power for the object with a force of 600 Newton is moved a distance of 30 meters in 10 seconds?

a) 180 W
b) 18,000 W
c) 1,800 W

Câu 56: What is the formula of power?

a) Power = Work/Time
b) Power = Work/Distance
c) Power = Work/Gravity

Câu 57: Newton's First Law is:

a) A body at rest remains at rest and a body in motion continues to move at a constant velocity unless acted upon by an unbalanced external force
b) A body at rest remains at rest and a body in motion continues to move at a constant velocity unless acted upon by an balanced external force
c) A body at rest remains at rest and a body in motion continues to move at a constant velocity without external force

Câu 58: Newton’s Second Law is:

a) The rate of change of momentum of a body is proportional to the applied force and takes place in the direction in which the force acts
b) The rate of change of momentum of a body is inversely proportional to the applied force and takes place in the direction in which the force acts
c) The rate of change of momentum of a body is not related to the applied force and takes place in the direction in which the force acts

Câu 59: Formula of Newton’s Second Law is:

a) Force = Weight . Acceleration (F = W.a)
b) Force = Mass . Acceleration (F = m.a)
c) Force = Mass . Velocity (F = m.v)

Câu 60: A body has mass 50 kg, how many Force needs for moving it with acceleration 5 m/s²? Assume that friction is Zero and gravity is 9.81 m/s²

a) F = 2,052.5 N
b) F = 2,252.5 N
c) F = 2,452.5 N

Câu 61: Newton’s Third Law is:

a) Every action has an equal and opposite reaction
b) Every action has an opposite reaction and can not determine
c) Every action has an opposite reaction and equal 2 times of this reaction

Câu 62: Energy is defined as:

a) The “Capacity to Accelerate”
b) The “Capacity to do Work”
c) The “Capacity to Decelerate”

Câu 63: Formula for Kinetic Energy (Ek) is:

a) Ek = 1/2 (Mass . Velocity²)
b) Ek = 1/2 (Mass . Acceleration²)
c) Ek = 1/2 (Mass . Force²)

Câu 64: Calculate Kinetic Energy of matter has Mass = 5kg and Velocity = 2m/s

a) Ek = 30 (J)
b) Ek = 20 (J)
c) Ek = 10 (J)

Câu 65: A body of mass 10 kg falls to the earth from a height of 300m above the surface of the earth. How many Potential Energy of this body? Gravity is 9.81 m/s²

a) 26,430 (J)
b) 20,430 (J)
c) 29,430 (J)

Câu 66: Thermodynamic Temperature Unit is:

a) Kelvin
b) Joule
c) Joule/second

Câu 67: What is the efficiency of energy conversion?

a) The ratio between the output into a mechanism and the useful input of the mechanism
b) The ratio between the input into a mechanism and the useful output of the mechanism
c) The different between the input into a mechanism and the useful output of the mechanism

Câu 68: The formula for efficiency is as follows:

a) Ŋ = Pout/Pin
b) Ŋ = Fout/Fin
c) Ŋ = Tout/Tin

Câu 69: A machine has Power output = 100 Watts, The Efficiency is 80%. How many Power is lost?

a) Ploss = 15 W
b) Ploss = 35 W
c) Ploss = 25 W

Câu 70: Gyroscopic are used to detect:

a) Turns around the x, y or z axis of an aircraft
b) Turns around the only z axis of an aircraft
c) Turns around the x or z axis of an aircraft

Câu 71: A matter has mass 500 kg and velocity 5 m/s. How many Momentum Quantity

a) Momentum = 2500 kg.m/s
b) Momentum = 2000 kg.m/s
c) Momentum = 1000 kg.m/s

Câu 72: How is Specific Gravity calculated?

a) Specific gravity is calculated by comparing the weight of a definite volume of substance with the weight of an equal volume of alcohol
b) Specific gravity is calculated by comparing the weight of a definite volume of substance with the weight of an equal volume of water
c) Specific gravity is calculated by comparing the weight of a definite volume of substance with the weight of an equal volume of mercury

Câu 73: The specific gravity of methylated spirit is 0.8. Its density is:

a) 800 kg/m³
b) 80 kg/m³
c) 8 kg/m³

Câu 74: The density of Copper (Cu) is 8,900kg/m3. What is its relative density?

a) 890
b) 89
c) 8.9

Câu 75: A pilot requests 9.2 tons of fuel. The bowser driver reports to the pilot that the specific gravity is 0.8, what will the uplift be?

a) 11,500 liters
b) 10,500 liters
c) 9,500 liters

Câu 76: Given that 1 cubic foot of water weighs 62.4 lbs and the specific gravity of fuel is 0.81, what is the weight of 10 cubic foot of fuel?

a) 402.8 lbs
b) 505.4 lbs
c) 770.3 lbs

Câu 77: What is the purpose of hydrometer?

a) Hydrometer is used to measure the specific gravity of solids
b) Hydrometer is used to measure the specific gravity of gas
c) Hydrometer is used to measure the specific gravity of liquids

Câu 78: The equation defining pressure is:

a) Pressure = Force /Area
b) Pressure = Force /Volume
c) Pressure = Weight /Area

Câu 79: Pressure in a pipe is:

a) Force per unit area
b) Weight per unit area
c) Mass per unit area

Câu 80: The Unit of pressure is Pascal, this Unit equals:

a) Pa = N/m²
b) Pa = N/m
c) Pa = N.m

Câu 81: On a day when the atmosphere pressure is 102 kPa, what is the force acting on a desk top having an area of 5 m²?

a) 710 kN
b) 610 kN
c) 510 kN

Câu 82: 101,3 kPa commonly written as:

a) 1013 hPa
b) 10130 hPa
c) 101.3 Pa

Câu 83: In the English system the height of the mercury column is:

a) 29.92 mm
b) 29.92 cm
c) 29.92 in

Câu 84: The general relation which connects gauge pressure, absolute pressure and atmospheric pressure is:

a) Pabs = Pgauge - Patm
b) Pabs = Patm - Pgauge
c) Pabs = Pgauge + Patm

Câu 85: Atmospheric pressure is 14.6 psi and the tyre gauge is showed 32 psi when using measure tyre pressure. How many actual pressure the gas is exerting on the inner walls of the tyre?

a) 46.6 psi
b) 17.4 psi
c) 32.0 psi

Câu 86: The zero on the absolute pressure scale is the pressure exerted by:

a) A normal air
b) A perfect vacuum
c) An air at 10.000m

Câu 87: What is a constant factor to calculate the volume change caused by pressure?

a) It is the compressibility
b) It is the viscosity
c) It is the expansion

Câu 88: If pressure on a liquid increases, whilst temperature is held constant, the volume will

a) Decrease
b) Remain constant
c) Increase

Câu 89: Which is the viscosity of the fluid influenced by?

a) The pressure
b) The volume
c) The temperature

Câu 90: In fluids, the following factors are important for the calculation of fluid resistance:

a) Size of object, form of object and density of the fluid
b) Size of object, form of object and density of object
c) Size of object, form of object

Câu 91: For venturi tube, when fluid enters the restriction, how is fluid speed?

a) Fluid speed increase
b) Fluid speed decrease
c) Fluid speed is constant

Câu 92: What is the formula to change temperature from the Celsius reading to a Kevin reading?

a) K = °C + 273
b) K = °C + 237
c) K = °C + 373

Câu 93: How many temperature on The Kevin scale when water starts freezing?

a) 273° K
b) 0° K
c) 373° K

Câu 94: One degree increment on the Centigrade scale is equal to what increment on the Fahrenheit scale?

a) 30° F
b) 12° F
c) 33.8° F

Câu 95: Normally, how do liquids expansion compare with solids?

a) Liquids expand more than solids
b) Liquids expand less than solids
c) Liquids expand as much as solids

Câu 96: How is the Metric Equation for heating? Q: heat gained or lost, m: mass of the body, C: specific heat, ∆T: temperature change

a) Q = C.∆T/m
b) Q = m.C.∆T
c) Q = C.∆T/m

Câu 97: How much heat must be supplied to raise the temperature of 3 kg aluminum fitting from 20°C to 30°C? Know that: specific heat of the substance is 0.912 kJ/kg

a) 37.36 kJ
b) 17.36 kJ
c) 27.36 kJ

Câu 98: If 5 kg of water at 30°C are mixed with 3 kg of water at 10°C, what is the final temperature of the mixture?

a) 20
b) 15
c) 10

Câu 99: What is the Boyle-Mariotte Law statement?

a) When you decrease the volume of gas in a container, the pressure of the gas will increase
b) When you decrease the volume of gas in a container, the pressure of the gas will decrease proportionally
c) When you decrease the volume of gas in a container, the pressure of the gas will not change

Câu 100: What is the Gay-Lussac’s Law statement?

a) When you increase the temperature of a gas, the volume of the gas will not change
b) When you increase the temperature of a gas, the volume of the gas will also increase
c) When you increase the temperature of a gas, the volume of the gas will decrease

Câu 101: The chemical reaction is typically a hydrocarbon reacting with oxygen to form the following result:

a) Carbon dioxide and heat
b) Carbon dioxide, water and heat
c) Carbon dioxide, water, ozone and heat

Câu 102: How much speed of light in free space (a vacuum)?

a) Approximately 3x10^8 m/s
b) Approximately 5x10^8 km/h
c) Approximately 3x10^6 m/s

Câu 103: Which is the speed of the wave equal to?

a) The speed of the wave is equal to the wavelength divided by the frequency
b) The speed of the wave is equal to the wavelength multiplied by the frequency
c) The speed of the wave is equal to the wavelength divide the frequency

Câu 104: The light waves have very small wavelengths and they are measured in:

a) Milimetre
b) Micrometre
c) Nanometre

Câu 105: For the light reflection at plane surfaces, how is the angle of incidence?

a) The angle of incidence equals to the angle of reflection plus 90o
b) The angle of incidence equals to the angle of reflection
c) The angle of incidence equals to a half of the reflection angle

Câu 106: If an object placed in front of plane mirror, which image is created?

a) Virtual image and the same size as the object
b) Virtual image and behind the mirror
c) Virtual image, behind the mirror and same size as the object

Câu 107: How many kinds of spherical mirrors? Detail them

a) 2 kinds: Concave and Convex Mirror
b) 3 kinds: Concave, Convex and Plane Mirror
c) 2 kinds: Concave and Curved Mirror

Câu 108: What is Snell’s law statement for refraction?

a) The ratio of the sine of the angle of incidence and the sine of the angle of refraction is proportional to refraction surface material
b) The ratio of the sine of the angle of incidence and the sine of the angle of refraction is proportional to refraction surface angle
c) The ratio of the sine of the angle of incidence and the sine of the angle of refraction is a constant

Câu 109: Which colors of the spectrum are widely accepted to be?