[2020/2021 WAEC] Waec 2020 PHYSICS PRACTICAL 3 Questions and Answers Verified Expo Solutions now Posted Here

Free Waec 2020 PHYSICS PRACTICAL 3 Questions and Answers Verified Expo Solutions now Posted Here

EXAM SCHEDULE

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Thursday, 20th August 2020

Physics 3(Practical) 9:30am – 12:15pm

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SOLUTIONS

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

(1bi)

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

(1bii)

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

(1bi)

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

2

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

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.

(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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