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PHYSICS PRACTICAL ANSWERS


(2a)
In a tabular form:


Under tita°:
75, 65, 55, 45, 35


Under MO(cm):
1.1, 2.0, 2.5, 3.4, 3.9


Under NO(cm):
6.2, 6.4, 6.6, 6.8, 7.2


Under H=MO/NO:
0.177, 0.313, 0.379, 0.500, .542


Under Costita:
0.2588, 0.4226, 0.5736, 0.7071, 0.8192


(2axiii)
From the graph
Slope, S =Δcostita/^ΔH 
= 0.75-0.45/0.5-0.3
= 0.3/0.2
=1.5


(2axiv)  
(i) I ensured both the object and the pins were in straight lines so as to avoid error due to parallax.
(ii)  I made sure there was no air interference


(2bi) 
Snell's law of refraction states that the ratio of the sine of angle of incidence to the sine of the angle of refraction is a constant for a given pair of media.  
I.e Sini/sinr = Π
Where Π is known as refractive index. 


(2bii) 
Given refractive index of glass = 1.5
i.e aΠg = 1.5(from air to glass)
SinC/sin90 = gΠa
SinC/Sinn90 = 1/aΠg
SinC/1 = 1/1.5
SinC= 0.6667
C = sin^-1(0.6667)
Critical angle for glass C = 42°




====================================================




(3a)
(ii) Vo = 2.00v


(3av) 
In a tabular form 
Under S/N
1, 2, 3, 4, 5


Under R(ohms):
2, 3, 4, 5, 6


Under V(v):
2.10, 2.30, 2.40, 2.50, 2.60


Under R^-1:
0.500, 0.333, 0.250, 0.200, 0.167


Under V^-1(v^-1):
0.476, 0.435, 0.417, 0.400, 0.385


3vii Slope, = Δv^-1/ΔR-1
= 0.5 - 0.355/0.6 - 0
= 0.145/0.6
S = 0.242


Intercept, C = 0.355v^-1


(3aviii) 
K = S/C
K = 0.242/0.355
K = 0.68


(3ix) 
(i) I ensured tight connections. 
(ii) I ensured clean terminals.


(3bi) 
(i) Temperature of wire 
(ii) Cross sectional area of wire
(iii) Length of wire 
(iv) Nature of wire


(3bii) 
Draw the diagram 


Effective E.m.f = 2v(parallel connection)
Effective internal resistance  
= r * r/r + r = r/2ohms


Current, I , 0.8A
External resistance R = 2A
 Using,
E = I(R+r)
2 = 0.8(2+r/2)
2.5 = (2+r/2) 
2.5 - 2 = r/2
0.5 = r/2
r = 0.5*2 = 1ohms




Tuesday 5th June 2018
Practical � Physics � 10:00am � 12:45pm



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2018 Neco Physics Practical Questions and Answers is available ,all you need to do is to follow the instructions above, get verified Physics Practical Questions and Answers here, question and answers are now Available. expo for Neco 2018 Physics Practical, exam runs for Physics Practical Questions and Answers


Also Read>>   2018 Neco Biology Practical Questions and Answers | Biology Practical Expo



2018 Neco Physics Practical Questions and Answers is available ,all you need to do is to follow the instructions above, get verified Physics Practical Questions and Answers here, question and answers are now Available. expo for Neco 2018 Physics Practical, exam runs for Physics Practical Questions and Answers



Also Read>>  2018 Neco Biology Objective and Essay Questions and Answers | Biology Expo


2018 Neco Physics Practical Questions and Answers is available ,all you need to do is to follow the instructions above, get verified Physics Practical Questions and Answers here, question and answers are now Available. expo for Neco 2018 Physics Practical, exam runs for Physics Practical Questions and Answers


Last edited by Emmi on Tue 5 Jun 2018 - 10:18; edited 2 times in total

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