# 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

the same point

(1 continues)

precaution:

(i)i ensured that m1 is

completely immersed in water

(ii)i ensure that parallax error is

(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

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

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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