Physics Answers (NECO 2015

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Physics Answers (NECO 2015
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    Use Type in your Exam.
    Physics-Obj PHYSIC TYPE C
    1DDCADDBCDC
    11ECACECCCBC
    21EEABBBEDEE
    31BECEBADDEC
    41BDDBAEDEDB
    51DAEACDBEDC

    Use This To Identify Your Answers For The Objectives.

    1D -I and II only
    2D-3.34*10^-7N
    3C-4.0*10^3
    4A-332ms^-1
    5D-0.45m
    6D-saxophone and trumpet
    7B-sqrootVR^2 (Vc-VL)^2
    8C-copper
    9D-II and III only
    10C-4.84&10^-19J
    11E-3.3*10^-10Ns
    12C-Focusing collector
    13A-benue
    14C-recieves signal
    15E-transportation
    16C-101K
    17C-prevent electric sparks
    18C-R and RM
    19B-5.0s
    20C-173.2J
    21E-80.0%
    22E-Venier calipers and spring balance
    23A-centrifugal
    24B-360m
    25B-beyond 2f
    26B-52.50cm
    27E-shekere
    28D-diffusion
    29E-I,II and III
    30E-Neutrons
    31B-5ohm
    32E-400.0Vm^-1
    33C-I and III only
    34C13.30cm
    35B-Hot body and thermophile
    36A-before,before
    37D-26.7mm
    38D-10.5
    39E-80.00mmHg
    40C-7.74N 41B-(x-z)/(x-y)
    42D-240m
    43D-interchanging the polarity of the magnet
    44B-minimize energy losses
    45A-perforator
    46E-15/16
    47D-Y and X-Y
    48E-(E2-E1)h^-1
    49D-magnet is moving away from the coil
    50B-150V
    51D-VL leads IL by pie/2 rad
    52A-A red surface appearing black when viewed under green light
    53E-Sun and firefly
    54A-2.0
    55C-methane
    56D-inertia
    57B-Burning of firewood
    58E
    59D-momentum and weight
    60C-w^2/2x


    Theory Answers

    NOTE: / means DIVISION
    * means multiplication
    tita u should know dat.
    ^ means raise to power
    sqr rut/ squar rut means square root


    (1a)
    -Coil
    -Rotor
    -Springs

    (1b)
    -For space exploration
    -For warfare
    -For scientific research

    (1c)
    -They are used as battery charger for boats
    and caravans
    -They are used for powering garden equipment

    (2)
    Given; d=10units
    R(6,4) and S(2,K)
    d=sqroot(y2-y1)^2+(x2-x1)^2
    10^2=(k-4)^2+(2-6)^2
    100=k^2-8k+16+16
    k^2-8k+32-100=0
    k^2-8k-68=0
    k=8+_sqroot(8^2-4*1*-68)/2
    k=8+_sqroot(64+272)/2
    k=8+_sqroot(64+272)/2
    k=8+_sqroot(336)/2
    k=8+_18.3/2
    k=8-18.3/2 or 8+18.3/2
    k=-5.15 or 13.15

    (4)
    Velocity ratio(V.R)=1/sintita
    4=1/sintita
    sintita=1/4
    tita=sin^-1(0.25)

    (7)
    This is because the speed of sound decreases
    as temperature increases.On hot day the
    temperature in high hence the speed decreases
    while on cold day,the speed increases because
    temperature is lowered

    (8)
    Given;length(l)=2.0m
    Resistance(R)=3.0ohm
    Diameter(d)=0.8mm
    d=0.8*10^-3m
    Resistivity=?
    R=el/A
    A=(pie*d^2)/4
    =3.142/4*(0.8*10^-3)^2
    A=(3.142*0.64*10^-6)/4
    A=0.50*10^-7m^2
    A=5*10^-7m^2
    3.0=(e*2)/(5*10^-7)
    e=(15*10^-7)/2
    Resistivity(e)=7.5*10^-7nm
    =======================
    3) A trajectory is the curved path of an object that has been fired or throw/a path followed by a projectile.
    3b) i) The force
    ii) The mass of the body.
    iii) The surface area of the projectile

    (12a) -Sugar tongs->third class
    -Nutcracker->second class
    -Bottle opener->first class

    (12b) (i)Archemedes' principle states that a body which is wholly or partially immersed in a fluid ,experiences loss in wheight which is equals to weight of fluid displaced

    (ii)This is due to the resulting apparent weight of the object in liquid which is less than true weight

    (12c)
    Given; mass(m)=500g=0.5kg
    Force constant(k)=4Nm^-1
    (i)Period (T)=w=sqroot(k/m)
    =sqroot(4/0.5)
    w=sqroot(8)
    =2.83rad/s
    w=2*pie*f
    w=2*pie(1/T)
    2.83=(2*3.142)/T
    T=(2*3.142)/2.83
    =2.22s
    (ii)frequencyf=1/T
    f=1/2.22
    =0.45Hz



    (5a)
    Energy is the ability to do work while power is the rate expended

    (5b)
    Given mass of man(m)=72kg
    height(h)=5m
    time(t)=40s
    p=mgh/t=energy/time
    p=(72*10*5)/40
    p=90W

    (14a)
    landa=wavelength
    x=wave distance
    v=velocity/speed

    (14b)
    (i)The eye is a natural optical device while camera is artificial optical device
    (ii)-Both eye and camera are used as optical device
    -Both eye and camera use lenses

    14c)
    i)Resonance is a phenomenon where by a
    vibrating body sets another body vibrating both
    having the same natural frequency
    ii)Length(L)=45cm=0.45m
    L=landa/2
    0.45=landa/2
    landa=0.45*2=0.90m
    v=f*landa
    340=fo*0.90
    fo=340//0.90
    fo=377.8Hz

    15a)
    i)-its presence gives charge
    -its presence bring spark
    -its presence bring light
    ii)The presence of charge is responsible for moving charges

    15b)
    i)-it is used for radio turning
    -it is used to reduce spark
    ii)-Area of over-lap between the plates
    -Dustance of seperation between the plates

    15c)
    Force(Fxy)=1.13*10^11N
    (Fzx)=3.60*10^11N
    i)Resultant force(Fzy)=R
    R=sqroot(Fxy^2+Fzx^2)
    R=sqroot(1.13*10^11)^2+(3.60*10^11)^2
    R=sqroot(1.28*10^22+12.96*10^22)
    R=sqroot(14.24*10^22)
    R=3.78*10^11N
    ii)tan tita=(3.60*10^11)/(1.13*10^11)
    =3.19
    tita=tan^-1(3.19)=72.60 degrees


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