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Waec 2018 Physics Practical Answers – May/June Expo

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Waec 2018 May/June Questions and Answers
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[4/4, 9:02 AM] Priya2: »
1)
Tabulate
s/n= 1,2,3,4,5
L(cm)= 130,110,90,70,50
T1(sec)= 45.70,42.00,38.00,33.10,28.70
T= 2.29,2.10,1.90,1.66,1,44
T^2= 5.22,4.41,3.61,2.74,2.06
L=100,80,60,40,20

1)
-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

MORE COMING…

3)
Tabulate

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.

SOLVING AND TYPING…
[4/4, 9:26 AM] Priya2: Phy – Pract – Answers

1axi)
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



2aix)

PRECAUTIONS
I) experiment must be carried out in a dark room

II) lens, screen and object must be in line


3aix)
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 .
[4/4, 9:26 AM] Priya2: Phy – Pract – Answers

1axi)
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

1b i.
focal length of an object is 20means that the distancebetween the optical centre or middle of the lens and its principal focus is 20cm

1bii.
given that u=x f=20 v=5

using the mirror formula
1/u + 1/v = 1/F

1/x + 1/5 = 1/20

multiply through by the LCM
1/x *5 + 1/5 * 5 = 1/20 * 5

5/x =5/20
5/x =1/4
taking the reciprocal
x/5 =4/1

cross multiply
x * 1 = 5 * 4
x =20

3aix)
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) a) length – longer wires have greater resistance.
b) thickness – smaller diameter wires have greater resistance.

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