# 2021 WAEC PHYSICS PRACTICAL ALT B: 2020 WAEC PHYSICS PRACTICAL ALT B Night before Exam

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(1bi)
Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces.

(1bii)
Man of the body in water =60g
Man of the body when attached with object =61g
Man of the object and the body in water =59g
R.D of object =61-59/61-60=2/1
R.D of object =200

2021 WAEC PHYSICS PRACTICAL ALT B (ESSAY, OBJ, THEORY, PRACTICALS ETC)
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(2)

2021 WAEC PHYSICS PRACTICAL ALT B (ESSAY, OBJ, THEORY, PRACTICALS ETC)
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(3ai)
TABULATE
S/N 1|2|3|4|5|

R(ohm)|1.00| 2.00| 3.00|4.00|5.00|

I(A) |0.55|0.40|0.33|0.35|0.30|

V(v) |0.65|0.50|0.45|0.42|0.40|

(3aviii)
Precautions
(i) I ensured tight connection of wires
(ii) I ensured that i avoided parallax error in reading ammeter and voltmeter reading

(3graph)

(3bi)
(i)Length of the wire
(ii)The cross-sectional area of the wire
(iii)The temperature of the wire
(iv)The material the wire is made of

(3bii)
View image
V=IR
1.2= 0.6 × R
R=1.2/0.6
R=2ohm

2021 WAEC PHYSICS PRACTICAL ALT B (ESSAY, OBJ, THEORY, PRACTICALS ETC)
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### QUESTIONS AND ANSWERS FOR 2021 WAEC PHYSICS PRACTICAL ALT B

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Updated At: April 17th 2021, (06:04:37)