# 2019 JAN/FEB WAEC GCE Physics Practical Questions and Answers

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# đź‘‘ 2019 WAEC GCE PHYSICS PRACTICAL ANSWERSđź‘‘

1)
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(2aviii)
(i) I would ensure that a sharp image is gotten before taking my reading
(ii) I would ensure that the lens and lens holder are kept in straight line with the object for effective and accurate reading

(2bi)
Tabluate:

Real image:
(i) Light rays pass through
(ii) Can be focused on the screen

Virtual image:
(i) Light rays do not pass through
(ii) Cannot be focused on the screen

(2bii)
The focal length of a converging lens is the distance from the lens where all rays parallel and close to the principal axis converge after refraction.
==============================

(3aiii)
S/N: 1,2,3,4,5,6
I(A): 3.00,1.00,0.60,0.45,0.35,0.25
R(ohms): 0.00,1.00,2.00,3.00,4.00,5.00
P=E/I(VA^1): 0.500,1.500,2.500,3.333,4.286,6.000

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(3aiv)

(3av)
Slope = DP/DR = P2-P1/R2-R1
Slope S = 6.25-1.50/5.5-1.00
= 4.75/4.50
= 1.06

(3avi)
(i) I would ensure tight connection
(ii) I would avoid zero error on the ammeter

(3bi)
Internal resistance of a cell is the opposition to the flow of current offered by the chemicals inside the cell(battery)

(3bii)
E=3V, R= 4 ohms , J= 0/5A , R= ?

E=I (R+r)
3= 0.5(4+r)
3=2+0.5r
3-2=0.5r
1=0.5r
r=1/0.5
r=2 ohms

(3)

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