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    WAEC GCE Physics Obj & Essay Questions And Answer 2021
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    WAEC GCE Physics Obj & Essay Questions And Answer 2021

    KazeemBy KazeemDecember 5, 2021No Comments3 Mins Read
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    WAEC GCE Physics Obj & Essay Questions And Answer 2021

     
    ==============================
    Physics OBJ
    01-10: ABACADABDD
    11-20: CBDBBCDBCA
    21-30: CCAABBBDBC
    31-40: ACDDCBAABA
    41-50: CDDBBBBB
    =========================================
    (1a)
    Power; = f*d/t = MLT^-² * L/T =ML²T^-³
    (1b)
    Force; = m*a =MLT^-²
    (1c)
    Pressure; F/A = MLT^-²/L² =ML^¹T^²
    ==============================
     
    (2)
    (i)Boron
    (ii)Aluminium
    (iii)Gallium
    ==============================
     
    (3a)
    (i)Iron
    (ii)nickel
    (3b)
    (i)Magnets are used in magnetic compass, doorbells, refrigerators.
    ==============================
     
    (4)
    w = 2π/T
    V/R = 2π/T
    R/V = T/2π
    R = VT/2π
    = 8×10³×5×10³/2×3.14
    = 6.37×10⁶m
    ==============================
    (5)
    Given :
    e= 5.00×10-³m
    P.E= 50J
    Using; P.E = 1/2ke²
    50 = 1/2×k×(5×10-³)²
    k = 50×2/(5×10-³)²
    = 50×2/25×10-⁶
    k = 4×10⁶N/m
    ==============================
    (11ai)
    (i)Lines of force Start only on positive charges and end only on negative charges.
    (ii)Lines of force do not cross each other
     
    (11aii)
    https://i.imgur.com/jOlDgxojpg
     
    (11bi)
    The surface density of a conductor is the quantity of say electric charge per unit area flowing through it.
     
    (11bii)
    The opposition to the flow of alternating current altered by a capacitor is known as capacitive reaction ie Xc
     
    (11ci)
    From ; Xc =1/2πfc, when frequency is increased, Xc drops. Consequently, from I = v/Xc, current increases
     
    (11cii)
    Vt = VmSin (wt-90°)
    If It = Im Sin wt
    Voltage lags by 90°
     
    (11ciii)
    Xc = 1/2πfc
    :. C = 1/2πfXc = 1/2*3.14*100*500
    = 1/314000
    = 3.185µF
     
    (11d)
    A stator and armature

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    WAEC GCE Physics Obj & Essay Questions And Answer 2021
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