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Author Topic: 2018/2019 WAEC WASSCE PHYSICS PRACTICAL Questions And Answer Expo/Runs  (Read 5075 times)

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Offline JEFFREY96

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Real 2018/2019 WAEC WASSCE PHYSICS PRACTICAL Real Questions And Answers  Expo Runs Runz

===================
Wednesday, 4th April, 2018

Physics 3 (Practical) (Alternative A) – 09:30 a.m. – 12:15 p.m. (1st Set)

Physics 3 (Practical) (Alternative A) – 12:40 p.m – 3:45 p.m. (2nd Set)
====================

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    1a)
    TABULATE:
    S/N: 1, 2 , 3, 4, 5
    L(cm): 90.00, 80.00, 70.00, 60.00, 50.00
    T(s): 38.00, 36.00, 34.00, 31.00, 28.00
    T = t/20(sqt): 1.90, 1.80, 1.70, 1.55, 1.40
    √L(cm^1/2): 9.49, 8.94, 8.37, 7.73, 7.07

    (1aix)
    Slope(s) = Δvertical/Δhorizontal
    =1.90 - 1.55/9.49 - 7.75
    = 0.35/1.74
    S = 0.201
    (1ax)
    g = 4π²/S²
    = 4 ×(3.142)²/(0.201)²
    = 977.4cm/s²

    (1axi)
    (i) I ensured the angle of oscillation is relatively
    small.
    (ii) I ensured that no external force is added to
    the system of oscillation.
    (iii) I ensured the oscillation is perfect

    Physics practical waec 2018 answers

    2ai)
    fo=15cm
    2av)
    a=60.00cm
    b=20.00cm
    Hence L=a/b=60.00/20.00
    L=3
    2avi)
    TABULATE
    S/N:1,2,3,4,5
    b(cm):20.00,25.00,35.00,40.00
    a(cm):60.00,37.50,30.00,26.25,24.00
    L=a/b:3.00,1.50,1.00,0.75,0.60
    2avii)
    Slope=Change in L/Change in a
    =(3-0.25)/(60-18.6)
    =2.75/41.4
    =0.006642
    2aviii)
    S^-1=1/S
    =(1/0.0066425cm)
    S=15.05
    S=15cm
    2aix)
    PRECAUTIONS
    -I ensured that all apparatus are in straight line
    -I avoided error due to parallax when reading the metre rule
    -I avoided zero error on the metre rule
    2bi)
    u=10cm
    f=15cm
    Using 1/v+1/u=1/f
    1/f-1/u=1/v
    1/v=1/15-1/10
    1/v=(2-3)/30
    1/v=-1/30
    v=-30cm
    The characteristics of image formed are:
    -It is virtual
    -It is enlarged and magnified ie twice or two times as big as the object m=2
    2bii)
    The concave mirror mounted in its holder is moved to and fro in front of the screen until a sharp image of the cross wire of the ray box is formed on the screen adjacent of the object.The distance between the mirror and the screen was measured as 30cm since the radius of curvature r=2fo then half is distance
    2bi)
    he characteristics of imaged formed are :
    i)It is virtual
    ii) It is enlarged or magnified i.e. twice or two times bigger as the object(m=2)

    3 )
    Tabulate
    s / n 1 ,2 ,3 ,4 ,5
    D ( cm) 25,35,50,65,80

    I ( A ) 1 . 99,1 . 75,1 . 55,1 . 44,1 . 36

    I ^ ( A ^ - 1 ) 0 . 530 ,0 . 571 ,0 . 645 ,0 . 694 ,0 . 735

    Lo ( j ^) - 0 . 2984,- 0 . 2434,- 0 . 1904,- 0 . 1586,- 0 . 1337

    3 )
    - precautions -
    take any two
    i) I ensured tight connections at the terminals
    ii) I avoided parallax error when taking reading from the ammeter .

    3 bii )
    i ) length - longer wires have greater resistance .
    ii) thickness - smaller diameter wires have greater resistance .

    3b (ii)
    -Temperature
     - Cross sectional area
     - Resistivity
    ====================







       
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