• Common Questions Asked in Post UTME Physics Exams. Day1

    Physics

    Chima Sunday (Tutor)
    25-05-2016 16:51:00 +0000

    The first question is on topic9 and the second question is from topic11. Try your best to solve them. Show working on paper and include a picture of your hand written Solution in your response. Happy Solving!

    1. Three 4Ω resistors were connected in series by Tola while Ade connected the same set of resistors in parallel. The ratio of the value obtained by Ade to that obtained by Tola is
    A. 1:2
    B. 1:9
    C. 1:10
    D. 1:5
    ( O.A.U. 2006)

    Solution
    In series connection by Tola
    Effective resistance RT = 4 + 4 + 4 = 16Ω
    In parallel connection by Ade
    effective resistance is given by 1/R = 1/4 + 1/4 + 1/4 = 3/4Ω
    therefor RA = 4/3 Thus ratio = Ade : Tola = 4/3 : 12
    multiplying both side by 3/4 i.e =4/3*3/4 : 12*3/4 = 1 : 9
    Answer is option B

    2. In a nuclear fusion experiment, the loss of mass amount to 1.0×10-5kg the amount of energy obtained from the fusion is?(speed of light = 3×*108m/s)
    . A. 3*10-4J
    B. 3*1011J
    C. 9*10-4J
    D. 9*1011J
    (UNN 2006/2008)

    Solution
    From Einstein energy and mass relation E = mc2
    Where c is the speed of light
    So m = 1.0×10-5kg
    E = 1.0×10-5 × (3×*108)2
    so that E = 9 *1011J
    So Answer is D



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