💯% CORRECT 2019 NECO GCE PHYSICS OBJ & ESSAY ANSWERS HERE!

NECO GCE – PHYSICS

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*Physics OBJ*
1-10: CACABDBECA
11-20: CCDBBDEECA
21-30: ECACEDACDB
31-40: CADBBDCBBC
41-50: EBCADACDAE
51-60: CDCBCEDCCB

(1a)
Electrolysis of water uses small current for a long time while electrolysis of salt water uses a large current for a short time. Electrolysis of water in its decomposition gives hydrogen and oxygen gases due to the passage of an electric current.

2H₂O(l) + Electric energy(heat energy)  –> O₂ + H₂O

In the electrolysis of salt water like sea water, the primary aim is to produce hydrogen at the cathod.

(1b)
x/20 = 60/80
80x = 60 x 20
80x = 1200
x = 1200/80
x = 15cm
.:. The distance between the lenses = 60cm – 15cm
  = 45cm

(10a)
Surface tension is the attractive force exerted upon the surface molecules of a liquid by the molecules beneath that tends to draw the surface molecules into the bulk of the liquid and makes the liquid assume the shape having the least surface area.

(10b)
{Pick any 2}
(i) It is in violation of the Heisenberg Uncertainty Principle. The Bohr Model considers electrons to have both a known radius and orbit, which is impossible according to Heisenberg.
(ii) The Bohr Model is very limited in terms of size. Poor spectral predictions are obtained when larger atoms are in question.
(iii) It cannot predict the relative intensities of spectral lines.
(iv) It does not explain the Zeeman Effect, when the spectral line is split into several components in the presence of a magnetic field.
(v) The Bohr Model does not account for the fact that accelerating electrons do not emit electromagnetic radiation.

(14ai)
(i) Eclipse
(ii) Shadows

(14aii)
There is a shade under a tree on a sunny day because a shadow is produced by the obstruction of light by the tree(opaque object).  The shade under a tree or a canopy, on a bright sunny day is a shadow produced by the opaque tree or canopy which obstructs light rays from the sun and prevents them from getting to the area of the shade.

(14b)
The walls and the ceiling of a shadow are covered with soft perforable boards because which can minimize the reflection of sound waves by absorbing them gently. Other methods of controlling reverberation are by changing curtains round the hall and by having more Springs in the walls.

(14ci)
It is preferred to plane mirror on the construction of periscope because it act to re-invert the image formed by the objective and present an erect image of the object to the eye piece which subsequently magnifies it.

(14cii)
It means that the angle of incidence in the denser medium is 42° when the angle of refraction is the less dense medium is 90°

(14di)
Data
M = 0.8g
L = 1.5m
F0 = 180H3
(i) F0 = 1/2L√T/M
F0² = T/4ML²
T = F0²×4ML²
T = (180)²×4×0.0008×1.5²
T = 233.28N

(14dii)
Speed = λF₀
V = L×F₀
V = 1.5×180
V = 270ms-¹

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