2024 NECO GCE PHYSICS: 2024 NECO GCE PHYSICS PRACTICAL ANSWERS (8122)

(1aix)
Tabulate
S/N; |1|2|3|4|5|

Q(g); |30.0|40.0|50.0|60.0|70.0|

Δ(cm);82 00|74.00|69.00|66 00|63.50|

X=Δ; - E; |32.50|24.50|19.50|16 50|14.00|

X^-¹(cm^-¹); |00.31|00.41|00.51|00.61|00.71

(1ax)


(1axi)
ΔQ/Δx^-¹
=50.9-30.0/0.06-0.031
Slope=20.9/0.029
=720.6≅ 721gcm

(1axii)
K=720.6/50
K=14.41gcm

(1axi)
(i)I would avoid draught
(ii)I would avoid parallax error in the reading meter rule

(1bi)
Moment of a force about a point is the product of force and perpendicular distance from the turning point. Moment = F x D The S.I unit is Nm.

(1bii)
(i)The total resultant force must be zero
(ii)The total force in one direction are equal to the total force in opposite direction. That is the total upward force is equal total downward force.

(3a)
Tabulate;
S/N; 1,2,3,4,5,6

R(Ω); |1.00|2.00|3.00|4.00|5.00|6.00|

I(A);0.88|0.70|0.55|0.46|0.41|0.36|

I^-¹(A^-¹); |1.1364|1.4706|1.8182|2.173|2.4390|2.7778|

(3av)
Graph


(3avi)
Slop;
ΔR/Ω/ΔI^¹/A^-¹
=(6.00-1.00)/Ω/(2.7778-1.1364)A^-¹
=5.00/Ω/1.6414/A^-¹
=3.046ΩA

Intercept;
The interception is 0.7 ohm's.

(3avii)
Precautions
(i)I will ensure Tight connections/clean terminals
(ii)I will ensure Key removed when reading are not being taken

(3bi)
(i) it give high current capacity
(ii) it's internal resistance is very low.

(3bii)
1/R=1/R¹+1/R²
1/R=1/3+1/2
1/R=5/6
R=6/5Ω or 1/¹/⁵ ohms