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Author Topic: 2013/2014 NECO June/July Physics Alternative to Practical Questions And Answers  (Read 12033 times)

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Offline MEGAX

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2013/2014 NECO June/July Physics Alternative to Practical Questions And Answers

NOTE:The Below Answers has already been posted @ EarlyFace Examination Room for Only Registered members during Exam. You must first Register Or Login as an EarlyFace member to be able to gain access any of the Links in Order to get this 2013/2014 Real NECO Questions And Answers Free Of Charge.

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NECO Physics Practical;
Quote
NOTE: ^ means Raise to Power.
Comma(,) means Next line eg: SN: 1,2,3,4,5 means under SN u will get 1,2,3,4 and 5 i.e under SN, you will get 1, under 1, u get 2, under 2, u get 3 and So on. So using comma means that you will draw a table and place the numbers AS i explained above.


(1a)
Table of values
sn:1,2,3,4,5
x(cm):10.0,15.0,20.0,25.0,30.0
Jk=y(cm):70.60,68.10,65.50,62.80,60.30
y^-1(cm):67.2,65.5,63.4,61.1,59.0
p=y-y^-1(cm):3.400,2.600,2.100,1.700,1.300

(1bi)
moment is the turning effect of forces about a point or axis. e.g rotation of wheels of vehicles. the unit is Nm and it is a vector quantity
principle of moments states that if a body is in equilibrium, then the sum of the clockwise moments about any point on the body is equal to the sum of the anticlockwise moments about the same point

Precaution:
(i)i ensured that m1 is completely immersed in water
(ii)i ensure that parallax error is avoided when taking readings

(1biii)
weight in air air=0.25
weight in water=0.15
upthrust=0.25-0.15=0.10
relative denstity= weight in air/weight in water
relative density= 0.25/0.10
=2.5

Slope 
slope=y2-y1/x2-x1 
9.4-3.0/1.2-0.43 
=8.31




(3a)
tables of value
sn:1,2,3,4,5,6
I/A:0.1,0.2,0.3,0.4.0.5,0.6,
V/V:0.50,1.50,2.00,2.30,2.50,3.00
I/I^-1/A^-1:10.000,5.000,3.333,2.000,1.667
V^-1/V^-1:2.000,0.667,0.500,0.400,0.333

precautions:
-i ensured tight connection
-i ensured error due to parallax when taking reading from the voltmeter

(3bi)
Ammeter:
-it is used for measuring current
-it is denoted by A
voltmeter:
-it is for measuring voltage
-it is denoted by V
3 cell. I=V/(R+r), V summation of d cascaded emfs, r is d summation of d cascaded internal resistances since, its same cell then. r=r=r, Therefore I=V/ (R+3r)

Slope=y2-y1/x2-x1=
79-60/4-1.2
=19/2.8
=6.786

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