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Neco Gce 2017/2018 Physics Practical Questions And Answers
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PHYSICS PRACTICAL ANSWER:-
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.
===========================
2bi) I Rainbow
II Wave length
2bii) M=V/U
object height=8cm
Image height=192cm
M=192/8
M=24cm
2v)
SLOPE
Slope,s =y2-y1/x2-x1
=56.7-20/4-1
=36.7/3
=12.233
=12.23
2vi)
U = 100/S = 100/12.23
= 8.176
=8.18
2vii)
- I will avoid error due to parallax while reading the meter rule.
-I will ensure the mass is kept dried before weighing
2aiv)
-I ensured tight connections
-I avoided error due to parallax when reading the voltmetre
-I ensured the key is opened after each reading to prevent the cell from running down
===========================
(3a)
TABULATE :
Readings: 1,2,3,4,5
R(n): 1.00,2.00,3.00,4.00,5.00
R^-1(n^-1): 1.000,0.500,0.333,0.250,0.200
l(cm): 13.50,27.50,41.50,55.00,69.50
l^-1(cm^-1): 0.074,0.036,0.024,0.018,0.014
(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
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