Verified Neco GCE 2018 Physics Obj & Theory Answers

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Verified Neco GCE 2018 Physics Obj & Theory Answers
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    NECO GCE PHYSICS

    Physics-Obj
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    Neco Gce Phyics



    PHYSICS COMPLETED

    (1a)
    An Artificial Satellite is an artificial object that is
    manufactured by humans and launched into the Earth’s orbit
    or in another planet’s orbit. These satellites revolve round
    the planets and provide all the information about the planet
    through satellite imagery.

    (1b)
    Rocket is multistage because the effectiveness of a rocket
    is inversely proportional to its mass and using stages
    allows us to reduce the mass of the rockets as it operates.




    (3a)
    Amplitude of a simple harmonic motion is defined as the
    maximum distance that an object moves from its equilibrium
    position.

    (3b)
    Tabulate:
    Speed:
    (i) Speed is how fast an object is moving.
    (ii) It is calculated by the displacement of space per a
    unit of time.
    (iii) speed does not deals on direction
    Velocity:
    (i) Velocity is the rate at which an object changes position
    in a certain direction.
    (ii) It is calculated by the displacement of space per a
    unit of time in a certain direction.
    (iii) Velocity deals with direction




    (5a)
    Heat Capacity (Cp) of a body is the quantity of heat
    required to raise the temperature of the body by 1 Kelvin.

    (5b)
    m=5kg, I=3.36*10^5Jkg^-1
    H=5*3.36*10^5J
    H=16.8*10^5J




    (10a)
    Surface tension is the force acting along the surface of a
    liquid causing the liquid surface to balance like a
    stretched elastic slain.

    (10b)
    In a tabular form:
    Adhesion:
    (i) Molecules of water
    (ii) Force of attraction between molecules of different
    kind.
    Cohesion
    (i) Molecules of glass and water
    (ii) Force of attraction between molecules of same kind.





    (12a)
    Friction is the force that comes to play a role in between
    the surfaces of the two solids in contact and tends to
    oppose the motion of one over the other.

    (12bi)
    A projectile is an object or body launched into the air and
    allowed to move on its own or more freely under gravity.

    (12bii)
    (i) A thrown javelin.
    (ii) Shooting of catapult.

    (12c)
    Centrifugal takes place along the radius of the circle from
    the center out towards the object while centripetal, it is
    the opposite, taking place also along the radius of the
    circle, but from the object in towards the center.

    (12d)
    From 1st condition of equilibrium;
    Total upward forces = Total downward forces.
    C+D = 20N
    From 2nd condition.
    Total clockwise moment = Total anticlockwise moment
    Taking moment about C
    20*5 = D*(12+5) = 17D
    100 = 17D
    D = 100/17
    D = 5.88N
    From 1st condition of equilibrium
    C+D = 20N
    C + 5.88 = 20
    C = 20 - 5.88
    C = 14.12N




    (14a)
    Compression is the ability of wave to compress/sink together after propagation WHILE refraction is the ability of wave to depart after propagation.

    (14b)
    (i) Shadow
    (ii) Pin hole camera.

    (14c)
    Echo is used as nuisance in an auditorium while lenses is used in the correct ion of sight






    (NUMBER 1)

    (1a)

    An Artificial Satellite is an artificial object that is manufactured by humans and launched into the Earth’s orbit or in another planet’s orbit. These satellites revolve round the planets and provide all the information about the planet through satellite imagery.


    (1b)
    A multistage rocket consists of two or more sections called stages. Each state has a rocket engine and propellant.A rocket is multistage because Rocket travelling to space requires more than one engine. The reason is because it will require much large amount of fuel or propellant to gain the speed required to escape earth gravity

    (5a)
    Heat Capacity (Cp) of a body is the quantity of heat required to raise the temperature of the body by 1 Kelvin.
    (5b)
    m=5kg, I=3.36*10^5Jkg^-1
    H=5*3.36*10^5J
    H=16.8*10^5J
    10a
    Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible. Surface tension allows insects, usually denser than water, to float and slide on a water surface.


    (8a)It is the measure of how easily an electron
    can flow in that given wire.
    It depends on experiment temperature,
    electron density, current density .


    12a)
    Friction
    Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

    12bi)
    A projectile is any object thrown into space by the exertion of a force. Although any object in motion through space may be called a projectile, the term more commonly refers to a ranged weapon. Mathematical equations of motion are used to analyze projectile trajectory.

    12c)
    Centripetal force is defined as, “The component of force acting on a body in curvilinear motion that is directed toward the center of curvature or axis of rotation,” while centrifugal force is defined as, “The apparent
    force , equal and opposite to the
    centripetal force , drawing a rotating body away from the center of

    10b)
    Adhesion vs. Cohesion . ... The
    difference between them is that
    adhesion refers to the clinging of unlike molecules and cohesion refers to the clinging of like molecules.
    Adhesion is the mutual attraction
    between unlike molecules that causes them to cling to one another
    15a)lens law of electromagnetic introduction state that the individual emf is such as way to oppose the direction of motion or change in producing it.

    9b)
    iron
    nickel
    and cobalt


    (3a)
    Amplitude of a simple harmonic motion is defined as the maximum distance that an object moves from its equilibrium position.
    (3b)
    -Speed-
    (i)Speed is how fast an object is moving.
    (ii)It is calculated by the displacement of space per a unit of time.
    (iii)speed does not deals on direction
    -Velocity-
    (i)Velocity is the rate at which an object changes position in a certain direction.
    (ii)It is calculated by the displacement of space per a unit of time in a certain direction.
    (iii)Velocity deals with direction


    (5a)
    Heat Capacity (Cp) of a body is the quantity of heat required to raise the temperature of the body by 1 Kelvin.


    (5b)
    m=5kg, I=3.36×10^5Jkg^-1
    H=5×3.36×10^5J
    H=16.8×10^5J

    (3a)
    Amplitude of a simple harmonic motion is defined as the maximum distance that an object moves from its equilibrium position.
    (3b)
    -Speed-
    (i)Speed is how fast an object is moving.
    (ii)It is calculated by the displacement of space per a unit of time.
    (iii)speed does not deals on direction
    -Velocity-
    (i)Velocity is the rate at which an object changes position in a certain direction.
    (ii)It is calculated by the displacement of space per a unit of time in a certain direction.
    (iii)Velocity deals with direction





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