2018 NECO GCE PHYSICS PRACTICAL

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(NUMBER 1) (1vii) (PICK TWO) (i)I ensured mass did not tourch/rest on the table (ii)I avoided error due to parallax on metre rule (iii)I noted zero error on metre rule (iv)I avoided draught (1bi) The principal of moments state that if a body is in equilibrium,then the sum of the clockwise moments about any point on the body is equal to the sum of the anticlockwise moments about the same point (1bii) Clockwise moment =Anti clockwise moment 10×5 = RB × 7 RB= 10×5/7 RB=50/7 RB=7.14 RA + RB=10 RA+7.14 =10 RA=10 - 7.14 =2.86N (NUMBER 3) (3viii) (Pick two) (Precaution) (i)I would ensure that the key is opened when circuit is not in use to avoid the cell being used up (ii)I would ensure that the electrical wires are tightly connected (iii)I would ensure clean terminals (3bi) Lost volt is the voltage lost due to the internal resistance of a cell. It is measured in volts (3bii) E= I(R+r) 4=I(2+0.5) 4=2.5I I=4/2.5 I=1.6A

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