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WAEC 2019 Physics Practical Solution Answer – May/June Expo

WAEC Physics Practical Solution Questions and Answer – MAY/JUNE 2019 Expo Runz.

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    (1aviii)
    In a tabular form
    Under y(cm)
    20.0, 30.0, 40.0, 50.0, 60.0

    Under t(s)
    36.61, 33.66, 31.32, 28.62, 25.93

    Under T = t/20(s)
    1.8305, 1.6830, 1.5660, 1.4310, 1.2965

    Under T²(s²)
    3.3507, 2.8325, 2.4524, 2.0478, 1.6809

    (1ax)
    Slope s = ΔT²/Δy
    S = 4 - 2.5/0 - 39
    S = 1.5/-39
    S = -0.0385

    Intercept, C = 4.0

    (1axi)
    SR = c
    R = c/s = 4/-0.0385 = -103.9

    (1axii)
    (i) I ensured that the retort stand was well clamped.
    (ii) I avoided error due to parallax when reading the metre rule.

    (1 GRAPH)
    CLICK HERE FOR THE IMAGE

    (1bi)
    Draw the diagram
    (α) K.E is maximum
    (β) acceleration is maximum

    (1bii)
    Period, T = 2π√m/k
    Given : weight, W = 120N
    Mass = w/g = 120/10 = 12
    T = 45
    π = 3.142
    4 = 2(3.142)√12/k
    0.6365 = √12/k
    Square both sides
    0.405 = 12
    K = 12/0.405 = 29.6

    (3ai)
    E.m.f, E = 3.00v

    (3avii)
    In a tabular form
    Under R(ohms)
    2.0, 5.0, 10.0, 12.0, 15.0, 20.0

    Under V(v)
    0.86, 0.62, 0.43, 0.38, 0.32, 0.25

    Under V-¹(v-¹)
    1.1628, 1.6129, 2.3256, 2.6316, 3.1250, 4.0000

    (3aix)
    Slope s = ΔR/Δv-¹
    =17.5 - 4.25/3.5 - 1.5
    =13.25/2
    =6.625

    Intercept, C = -5.75

    (3ax)
    S = Roα
    6.625 = 0.85(α)
    α = 6.625/0.85 = 7.79

    C = -(Ro + β)
    = -5.75 = -(0.85 + β)
    β = 5.75 - 0.85
    β = 4.9

    (3axi)
    (i) I ensured tight connections.
    (ii) I avoided error due to parallax when reading the voltmeter.

    (3bi)
    Vab = 12 - 8 = 4v
    Rab = 4×5/4+5 = 20/9ohms
    Iab = Vab/Rab = 4/20/9 = 4 ×9/20 = 9/5
    =1.8A

    Power = I²ab Rab
    =1.8² * 20/9
    = 7.2watts

    (3bii)
    Current in line = power/voltage = 3600/240
    =15A
    Circuit breaker remain closed because current in line is less than 20A

    (3)
    CLICK HERE FOR THE IMAGE
    (3x)
    (i) I avoided parallax error when taking readings from the voltmeter
    (ii) I ensured that the key was opened when reading is not been taking 


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