Verified NECO GCE 2018 Physics Practical Answers (LOCKED)

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Verified NECO GCE 2018 Physics Practical Answers (LOCKED)
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    NECO GCE PHYSICS PRACTICAL



    1bii
    It’s because an iron ship is not completely solid. It has full of air filled in it. So the average density of the ship as a whole is less than the density of water. Therefore immersed portion of the ship displaces water equal to its weight. So the ship floats whereas a sheet of iron is compact and there are no air spaces inside it. Iron is denser than that of water. The weight of the sheet is greater than the weight of the water displaced by the sheet. So it sinks.

    Typing...............



    2bi) I Rainbow
    II Wave length

    2v)
    ​SLOPE​

    Slope,s =y2-y1/x2-x1
    =56.7-20/4-1

    =36.7/3

    =12.233

    =12.23




    3a)Readings
    1 | R(ohms) | R^-1(ohms)| L(cm) | L(cm)

    1 | 1.00 | 1.000 | 13.50 | 0.074
    2 | 2.00 | 0.500 | 27.50 | 0.036
    3 | 3.00 | 0.333 | 41.50 | 0.024
    4 | 4.00 | 0.250 | 55.00 | 0.018
    5 | 5.00 | 0.200 | 69.00 | 0.014
    Note:where u see ohms put the ohms sign
    (3av)
    Slope=Change in R^-1/Change in L^-1

    =(0.500-0.200)/(0.036-0.018)

    S=0.30/0.018

    =16.67cm/n

    (3avi)

    Rs=100/16.67

    Rs=5.99880n/cm

    Rs=6.0n/cm




    *QUESTION ONE*

    (a)
    -vi-
    • I would have ensure that the experiment was not affected by air interference when determining the balance point by closing all air source in the laboratory.
    • I would have ensure that I avoid parallax error by ensuring that I take my readings by placing my eyes vertically above the
    metre rule.
    • I would have ensure that the masses did not touch the table when determining the balance point.


    (b)
    -i- The Principle of Moments states that when in equilibrium the total sum of the anti-clockwise moment is equal to the total sum of the clockwise moment. When a system is stable or balance it is said to be in equilibrium as all the forces acting on the system cancel each other out.




    *QUESTION THREE*

    (a)
    -viii-
    • I would have ensure that the electrical wires were tightly connected to the terminals in order to avoid current fluctuations.
    • I would have ensure that the key is removed whenever the electric circuit is not in use so as not to allow the battery to run down.
    • I would have ensure that I avoid error due to parallax when taking my readings by placing my eyes directly above the galvanometer.



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