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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