A2AM

1. Which of the following atomic particle is negative?. Proton. Neutron. Electron.

How is called the number of protons plus the number of neutrons?. atomic mass. protoneutrons mass. atomic essence.

Which is the name of the transformation required to change a solid to a liquid? [01. Matter - Approved] unchanged. o fusion. o condensation. o vaporisation.

What is the Atomic Mass?. Is the mass of an atom of a single element; it corresponds to the protons mass. Is the mass of an atom of a single element; it corresponds to the neutrons mass. o Is the mass of an atom of a single element; it corresponds to the sum of protons and neutrons.

What is the main difference between gases and solid/liquid matter?. They have no definitive shape. They have no definitive volume. They have no definitive shape and volume.

Which is the smallest particle of matter that can exist in nature?. an atom Correct. an isotope. a molecule.

What happens when the light rays pass through a medium with a lower refractive index?. the refractive angle is lower than the reflective angle. its speed increases. its speed decreases.

Is it possible to send more than one signal inside the same optical fiber?. It depends on the light intensity. No. Yes.

Which of the following is a reflection low?. The angle of incidence is equal to the angle of reflection. The angle of incidence is different form the angle of reflection. The angle of incidence is equal to the angle of reflection but it must be acute.

Huygens consider light as: Composed by beams of particles that are produced by luminous bodies. Something having undulating nature and he explained the propagation with laws of undulating motion. Something that follows alternatively undulating and corpuscle behaviours.

When the reflective angle is higher than the refractive angle?. o When the refractive index of the second medium is higher than the first one. When the refractive index of the second medium is the same as the first one. When the refractive index of the second medium is lower than the first one.

Which is the value of the speed of light?. 300000 m/s. 300000 Km/h. 300000 Km/s.

What is the length of the wave (λ)?. the maximum distance between two next peaks of a periodic wave. the distance between two next peaks of a periodic wave. the average distance between two next peaks of a periodic wave.

How is called the distance between two next peaks of a periodic wave?. length of the wave (λ). mass of the wave (m). period of the wave (T).

Considering the Doppler effect, if the source of the wave is approaching the subject: It will be heard lower. It will be heard in the same way if the source is moving away the subject. It will be heard higher.

When does a constructive interference occur?. when the sum of two or more sound waves is null. when the sum of two or more sound waves produces a total wave with an amplitude lower than the original. when the sum of two or more sound waves produces a total wave with an amplitude higher than the original.

Which of the following is the correct formula to evaluate the speed of propagation of a wave?. c = λ/T. c = λ·T. c = T/λ.

What is the tension?. Is the characteristic to resist to an external force that tends to push the object inside. Is applied to a material when it is twisted. The force tending to separate an object.

What is the flexion?. The force tending to separate an object. The stress of shear tends to divide the body into slices. It is the ability to resist to an external force that tends to push the object towards inside.

How is called the force which opposes twisting deformation?. Torsion. strain. shear.

Which is the formula to compute the absolute density of a body, often indicated with ρ?. its mass multiplied by its volume. its mass divided by its volume. its mass multiplied by density coefficient.

What is the torsion?. a force which opposes bending deformation. a force which opposes twisting deformation. a force which opposes longitudinal deformation.

Which parameter can be computed as the ratio between the external force and the application area of the force?. hardness of the body. stress caused by an external force acting on a body. strain caused by an external force acting on a body.

What is the Young's modulus?. stress x strain. stress / strain. strain / stress.

What is causing the sliding friction?. It is caused by the rolling on curve surfaces. It is caused by the sliding between two plane surfaces. Is relative to a body immersed into a fluid or to different layers of the same fluid moving with a different velocity.

What is representing E in the Hooke's Low formula?. The Kronecker symbol. The Poisson modulus. o The Young modulus.

To which parameter is proportional the sliding friction?. the coefficient of sliding friction (µ). sliding velocity. area of the sliding surfaces.

How is possible to define a uniform circular motion?. A circular motion whose movement has a constant module velocity. A circular motion whose movement has a constant module direction. A circular motion whose movement has a variable module velocity.

Which one is the correct value of the gravity acceleration?. 9,81 m/s2. 98,1 m/s2. 0,981 m/s2.

How long does a free falling body, falling from a height of 2km, and assuming g = 10m/s2, take to strike the ground?. 80s. 20s. 400s.

Which one is the conversion factor that you use to convert km/h in m/s?. 360. 3.6. 36.

Which one is the correct expression of the rolling friction?. Fv=2μvFn. Fv=μvFn. Fv=4μvFn.

Which is the formula to compute the angular velocity (ω), given the period T?. 2π/T. 2πT. 4πT.

How long does it take a car moving at 60 km/h to travel 90 km?. 40 minutes. 90 minutes. 75 minutes.

Which is the unit of acceleration in the International System SI?. square metre (m²). metre per second (m/s). metre per second squared (m/s²).

Which one is the correct unit of measurement of the kinetic energy?. Newton meter. Joule. Watt.

Which is the relation between potential and kinetic energy?. When the kinetic energy of a freefalling object decrease the potential energy decrease. When the kinetic energy of a freefalling object increase the potential energy decrease. When the kinetic energy of a freefalling object increase the potential energy increase.

What is the unit of measurement of the force?. Pascal. Torr. Newton.

Which parameter can be computed as the ratio between the out power and input power?. the heat exchanged in the process. the total lost power. o the efficiency of a process.

The force is a: Pure number. Vector. Scalar.

Which mass produces an acceleration of 2.5 m/s² if a force of 10 N is acting on it?. 4 kg. 10 kg. 25 kg.

Which is the unit of impulse in the International System SI?. N x s. kg x s. J x s.

What is the mechanical advantage?. Is the ratio between the Weight moved and the Stress required. Is the ratio between the Stress required and the Weight moved. Is the product between the Weight moved and the Stress required.

Which of the following is the formula of impulse?. I=2 x F x ∆t. I=F/∆t. I=F x ∆t.

Which is the momentum of a ball having a mass of 2 grams and a velocity of 10 cm/s?. 0.0002 kgm/s. 5 kgm/s. 20 kgm/s.

Which of the following parameters is defined as I=F x ∆t?. the impulse. the force. the acceleration.

Which one is the correct expression of the density?. Volume/Mass. Mass*Volume. Mass/Volume.

What is the name of the instrument used to find out the density of fluids?. Densimeter. Distiller. Dosimeter.

Which is the definition of the relative density of a substance?. density of the body multiplied by the density of water. the density of the body divided by the density of water. density of the body squared multiplied by the density of water.

Increasing the altitude the density: Decrease. Increase. Remain constant.

What is the absolute pressure?. It is the pressure equivalent to the difference between two pressures. It is the pressure referred to the vacuum. It is the pressure shown directly on instrument dial.

Which of the following expression is correct?. Profile Drag = Form drag + Skin drag. Skin Drag = Form drag +Profile drag. Form Drag = Profile drag + Skin drag.