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Physics Practical 2015 NECO Expo




Monday 1st June Paper I: Practical – Physics
10:00am – 12:45pm
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(1) Tabulate
G=50cm, m1=50g, M=80g
Sn:1,2,3,4,5
AG(g): 5.00, 10.00, 15.00,20.0, 25.0
d(cm): 40.00, 35.00, 30.00, 25.00, 20.00
d2(cm): 17.00,15.00,12.50, 10.50, 8.50
d3(cm): 18.00, 15.00, 13.00, 11.32, 9.00
T(cm): 23.00, 20.00, 17.50,14.50, 12.00
U(cm): 22.00,20.00, 17.00, 13.68, 13.68, 11.00
precautionns:
-i avoided draught effect during the experiment
-i balanced the meter rule horizontally on the knife
edge before taking my readings
-i avoided parallax error on the metre rule

(1bi)
-it means the mass of a substance ratkion to the ratio
of equal volume of meter is 0.8

(1bii)
the density of the mass of hanger of mass 50g can be
determined by dividing the mass of 50kg to the
volume of the mass of hanger.
----------------

(3)Tabulate:
Sn:1,2,3,4,5,6
L(cm):10.0, 20.0,30.0,40.0,50.0,60.0,70.0
V(volt): 0.15,0.25, 0.35, 0.50,0.60,0.70
L^-1(cm^-1):0.100, 0.50,0.033,0.025,0.020, 0.016
V^-1(v^-1):6.667, 4.000, 2.857, 2.000, 1.667,1.429
precautions:
-i connected all the wires tightly together.
-i avoided dragging of the jockey on the
potentiometer wire.
-i avoided zero error on the voltmeter used.
-i ensured that the key is opened after each reading

(3b)
-potentionmeter gives accurate value than a
voltmeter
-potentiometer measures no current at full scale
deflection but voltmeter measures current

(3bii)
I=E/(r R)
E=Ir IR
E-IR=Ir
lost volt=E-IR

KEEP COOPERATING WITH WAPBAZE AND GET YOUR ANSWER EARLIER... THANK ME LATER....WRITE!!!






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