NECO (PHYSICS PRACTICAL) QUESTIONS nd ANSWERS WILL BE DROPED HERE..enter

By 06:23 Wed, 12 Jun 2013 Comments


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

table sof 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

(1 continues)

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

(3)

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

(3 continues)

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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