2020 Waec Physics Practical Answers

2020 Waec Chemistry Practical Answers

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(1)
S|N; 1|2|3|4|5|

M(g); 40.0|60.0|80.0|100.0|120.0|

X(cm);37.50|25.01|8.75|15.00|12.50|

X-¹(cm-¹); 0.027| 0.040|0.|053|0.067|0.08|

X-¹(x10-³); 27.00|40.00|53.00|67.00|80.00|

G=50.0cm
Y=30.0cm

Slope =∆M/∆X^-1= M2-M1/(X^-1) – (X^-1)
S= 120.0 -40/80.0-27
S= 80/53
S=1.509*10^3
S=1509

(x)
S=ymo
1509=30mo
mo=1509/30
mo=50.3

(1xi)
(i)Measure readings accurately
(ii)Avoid error due to parallax
(1bii)
CWM = ACWM
60*25 = x *30
30x = 1500
Divide through by 30
30x/30 = 1500/30
x=50g

The mass that should be placed at the 80cm mark of the meter rule to balance it horizontally is 50g

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(1bi)
Moment of a force can be defined as the product of the force and its perpendicular distance from its point of action.

(1bii)

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(3)
Graph!.

(3a)
(i)E=3.00v
Tabulate.
R(n); 1.0|2.0|4.0|6.0|8.0
I(A)0.40|0.35|0.28|0.22|0.18|
V(v)0.65|0.58|0.50|0 45|0.40|

(3bi)
(i) I avoided error due to parallax when reading the ammeter and voltmeter
(ii)I ensure tight connection.

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(3bi)
(i)it increase current supplied
(ii)it makes up for any detect on any cells

(3bii)
(i)The length of the resistor.
(ii)The thickness of the resistor.
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