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Neco Gce 2017 Physics Practical Answers – Nov/Dec Expo
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Neco Gce 2017 Physics Practical Answers – Nov/Dec Expo
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chidusky (m)
1508952104 ago
NECO GCE - PHYSICS PRACTICAL ANSWERS
Exam Time: Wednesday, 26th October, 2017
Physics 3 (Alternative to Practical)
2.00am – 4.45pm
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(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

(2v)
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
===========≠=================

(3a)
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

3)
-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
===============≠==================

(2bi)
I - Rainbow
II - Wave length

(2v)
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

==========================