WAEC 2018 Physics Practical Answer Expo Solution Questions And Answers May/June Free Expo FREE WAEC PHYSICS PRACTICAL EXPO ANSWERS 2018/2019

(1a)

TABULATE:

S/N: 1, 2 , 3, 4, 5

L(cm): 90.00, 80.00, 70.00, 60.00, 50.00

T(s): 38.00, 36.00, 34.00, 31.00, 28.00

T = t/20(sqt): 1.90, 1.80, 1.70, 1.55, 1.40

√L(cm^1/2): 9.49, 8.94, 8.37, 7.73, 7.07

(1aix) 

Slope(s) = Δvertical/Δhorizontal 

=1.90 - 1.55/9.49 - 7.75

= 0.35/1.74

S = 0.201

(1ax)

g = 4π²/S²

= 4 ×(3.142)²/(0.201)²

= 977.4cm/s²

(1axi)

(i) I ensured the angle of oscillation is relatively small. 

(ii) I ensured that no external force is added to the system of oscillation. 

(iii) I ensured the oscillation is perfect

3)

TABULATE

s / n 1 , 2 , 3 , 4 , 5

D (cm) 25, 35 , 50, 65, 80

I (A) 1 . 99, 1 . 75, 1 . 55, 1 . 44, 1 . 36

I ^ (A^ - 1) 0 . 530 , 0 . 571 , 0 . 645 , 0 . 694 , 0 . 735

Lo ( j ^) - 0 . 2984 , - 0 . 2434 , - 0 . 1904 , - 0 . 1586 , - 0 . 1337

3)

- precautions -

take any two

i) I removed key when reading is not taking

ii) I ensured tight connections at the terminals

iii) I avoided parallax error when taking reading from the ammeter.

3bii)

i) length - longer wires have greater resistance.

ii) thickness - smaller diameter wires have greater resistance.

1xii)

-precautions-

Take Any Two

i)I avoided conical oscillation 

ii)I avoided drought

iii)I avoided parallax error in taking reading from the metre rule

iv)I avoided zero error in taking reading from the stop watch

physicspractical com