WAEC GCE 2016 Physics Practical Answers - Nov/Dec Expo

This is WAEC GCE 2016 PHYSICS PRACTICAL EXPO 

Pls Tabulate:

xi(cm)|yi(cm)|zi(cm)|W1(Nx10^-2)|W2(Nx10^-2)|u=(w1-w2)(Nx10^-2)|v=(w1-w3)(Nx10-2)

=>1.80|1.50|1.70|3.6|3.00|3.40|0.60|0.20

=>3.80|3.00|3.00|7.6|6.00|6.00|1.60|1.60

=>5.50|4.40|5.00|11.10|8.00|10.00|2.20|1.00

=>7.30|5.90|6.60|14.60|11.80|13.00|2.80|1.40

=>9.20|7.30|8.30|18.40|14.60|16.60|3.80|1.80

=>11.10|8.30|10.00|22.20|16.60|20.00|5.60|2.20

(1b)

Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water.

(1bii)

Given volume of solid immersed

Vsi =1/2*30cm³

=15cm³

Density of liquid (water)ew= 1g/cm³

Acceleration due to gravity, g = 10m/s²

Upthrust, U= eVsi g

U= 1000*(15*10^-6)*10

U=15*10-²

U=0.15N

Weight of solid =mg

=EsVs g

given: Es=2.4g/cm³ (2400kg/m³)

Vs=30cm (30*10^-6 m³)

g=10m/s²

Weight, w=30*10^-6*2400*10

=72*10-²

=0.72N

Reading on spring balance =W-U

=0.72-0.15

=0.57N

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

(3aiv)

Tabulate pls:

S/n: 1,2,3,4,5,6

R/ohms: 0.00,1.00,2.00,3.00,4.00,5.00

I/A: 3.00,1.00,0.60,0.45,0.35,0.25

P=(E/I) V ohms^-1: 0.500,1.500,2.500,3.333,4.286,6.000

(3vi)

s=Y1-Y2/X2-X1 = 4-2/3.6-1.5

=2/2.1

=0.952

(3vii)

C = 0.5ohms

(3viii)

Resistance

(3ix)

-I ensured that the circuit is open after each reading to maintain the E.M.F of the battery

-I ensured that the Zero Error of the Ammeter is checked and noted

(3bii)

V = 4.5v

R = 4ohms

I = 0.9A

V = I(R+r)

where r = internal resistance

4.5 = 0.9(4+r)

.:. 4+r = 4.5/0.9

4+r = 5

r = 5-4

= 1 ohm.

Good luck!!! 

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