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WAEC 2014 :: PHYSICS PRACTICAL ANSWERS




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(3xi.)
1. i ensured that the key is not closed when no
reading are not taken.
2. i ensured the circuit parameters are tightly
connected to ensure accurate result.
3. i ensured that the jockey touches the exact
point on the potentiometer wire.

(3bii)
Given,
Vx=1.018V
Lx= 50.0cm
Vy=?
Ly=75.0cm
Vx/Lx = Vy/Ly
1.018/50 = Vy/75
Vy= (1.018 * 75)/50
Vy= 1.527V

(3bi.)
Emf of a battery is the potential difference
between the terminals of a cell when no current
flows in the circult.

(1a) (vii)
DRAW A TABLE:
S/N: 1,2,3,4,5
D: 140,120,100,80,60
T(sec): 4.8,4.1,3.3,2.6,1.9
W: 29.17,29.26,30.3,30.76,31.58
V: 58.33,58.53,60.6,61.52,63.15

(1)(XI)
Precautions:
-I ensured that the readings were taken without any error

-I ensured the mass roll down freely as being
influenced under gravity

(3a)(vi)
I=0.35A
PLS DRAW A TABLE.
i: 1,2,3,4,5
Xi(cm): 20.0,35.0,45.0,60.0,80.0
x^-1: 0.0500,0.0285,0.0222,0.0167,0.0125
I(A) : 1.50,1.45,1.35,1.30,1.25.

No 1 (VII)
S/N: 1,2,3,4,5
D: 140,120,100,80,60
T (second): 4.8,4.1,3.3,2.6,1.9
W: 29.17,29.26,30.3,30.76,31.58
V: 58.33,58.53,60.6,61.52,63.15


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(1Vii) Draw a table
S/N: 1 , 2 , 3 , 4 , 5
D/cm: 140 , 120 , 100 , 80 , 62
T/s: 1.25 , 1.10 , 0.93 , 0.83 , 0.72
W/ms-1: 1.12 , 1.10 , 1.08 , 0.96 ,0.83
V(ms-1): 224 , 220 , 216 , 193 , 167

(ix). Slope = (Y2-Y1)/ (X2-X1)
ms/S = (216 -167 ) / (0.93 -0.72)
ms/S = 49/0.21 = 233.3

(x) It determines the ratio of the distance
moved by effort to the distance moved by
load.

(XI)
Precautions:
-I ensured that the readings were taken
without any error
-I ensured the mass roll down freely as
being influenced under gravity

(1bi)
Velocity Ratio(V.R) = i/ sin(tita) = 1/(h/d)
V.R = D/h
h= height of inclinde plane

(1bii)
mass of object(m)= 5kg
Angle of inclination(tita)= 30degree
Force(F) Perpendicular to the plane is
F= mg Sin(tita)
F= 5*10*Sin30(degree)
F= 25N

(3). (vi)
I=0.35A
PLS DRAW A TABLE.
i: 1,2,3,4,5
Xi(cm): 20.0,35.0,45.0,60.0,80.0
x^-1: 0.0500,0.0285,0.0222,0.0167,0.0125
I(A) : 1.50,1.45,1.35,1.30,1.25.
=======

NOTE: ^ means raise to power.
i: means that under i, u will get 1,2,3,4,5..

========

3(viii)Slope,S=y2-y1/x2-x1
=(0.4000-0)cm-1/(1.500-1.125)A
=0.4000 cm^-1/0.375 A
=1.0667 cm-^1 A-^1
(ix)the value of Ii for which
X-1=0 is 1.125A
(x) I./I=1.125A/0.350A
=3.214

(3xi.)
1. i ensured that the key is not closed when
no reading are not taken.
2. i ensured the circuit parameters are
tightly connected to ensure accurate result.
3. i ensured that the jockey touches the
exact point on the potentiometer wire.

(3bi.)
Emf of a battery is the potential difference
between the terminals of a cell when no
current flows in the circuit.

(3bii)
Given,
Vx=1.018V
Lx= 50.0cm
Vy=?
Ly=75.0cm
Vx/Lx = Vy/Ly
1.018/50 = Vy/75
Vy= (1.018 * 75)/50
Vy= 1.527V

===COMPLETED===

NOTE: ^ means raise to power.
i: means that under i, u will get 1,2,3,4,5..