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VERIFIED 2018 WAEC Physics Practical Questions & Answers Now Available Here

Filed Under: Education

On: April 4, 2018

Naijaonly

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Physics practical waec 2018 answers

2ai )
fo= 15 cm
2av )
a= 60 .00 cm
b = 20 .00 cm
Hence L = a/ b = 60 .00 /20 .00
L= 3

2avi )
TABULATE
S/N :1 , 2, 3 , 4, 5
b ( cm) :20 .00 , 25 .00 , 35 .00 , 40 .00
a( cm ) :60 .00 , 37 .50 , 30 .00 , 26 .25 , 24 .00
L= a /b :3 .00 , 1.50 , 1 .00 , 0.75 , 0 .60
2avii )
Slope = Change in L/ Change in a
= ( 3- 0.25 ) / ( 60 -18 .6 )
= 2.75 / 41 .4
= 0.006642

2aviii )
S^- 1= 1 /S
= ( 1/ 0.0066425 cm)
S= 15 .05
S= 15 cm

2aix )
PRECAUTIONS
-I ensured that all apparatus are in straight line
-I avoided error due to parallax when reading the metre rule
-I avoided zero error on the metre rule

2bi )
u = 10 cm
f = 15 cm
Using 1/ v+ 1/ u = 1/ f
1/ f -1 /u = 1 /v
1/ v= 1/ 15 -1 /10
1/ v= ( 2- 3) / 30
1/ v= -1 /30
v= -30 cm
The characteristics of image formed are:
-It is virtual
-It is enlarged and magnified ie twice or two times as big as the object m= 2

2bii )
The concave mirror mounted in its holder is moved to and fro in front of the screen until a sharp image of the cross wire of the ray box is formed on the screen adjacent of the object .The distance between the mirror and the screen was measured as 30 cm since the radius of curvature r = 2fo then half is distance

2bi )
he characteristics of imaged formed are :
i) It is virtual
ii) It is enlarged or magnified i.e . twice or two times bigger as the object( m= 2)
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