WAEC Physics OBJ Answers 2026
01-10: DBDCABDDBC
11-20: ACABCDCCDB
21-30: DABACDABCB
31-40: ACBAADADCD
41-50: ACBBCBAABA
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WAEC Physics Essay Answers 2026
Number 1
(1a)
Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration due to the random motion of particles.
(1b)
(i)Brownian motion; random movement of smoke particles shows molecules are in constant random motion.
(ii)Diffusion; spontaneous mixing of gases/liquids shows particles move freely.
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Number 2
(2ai)
Holes
(2aii)
Electrons
(2b)
It requires no heating/filament, so it operates at room temperature and consumes less power.
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Number 3
(3a)
Stress = Force / Area = N m⁻²
Strain = no unit
Unit of Young’s modulus = Nm⁻² (Pascal, Pa)
(3b)
Since strain has no dimension,
E has same dimension as stress
Force = MLT⁻²
Area = L²
Stress = MLT⁻² / L² = ML⁻¹T⁻²
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Number 4
(4)
(i) A solar energy collector is a real device used to collect and convert solar energy, while a black body is a theoretical object.
(ii) A solar collector absorbs sunlight for useful heat, while a black body absorbs all radiation completely.
(iii) A solar collector is used in practical applications, while a black body is used for scientific studies.
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Number 5
(5)
GMm/R² = mv²/R → v² = GM/R
Period T = 2πR/v → v = 2πR/T
Substituting: (2πR/T)² = GM/R
4π²R²/T² = GM/R
T² = 4π²R³/GM
Since 4π² = 4 × (3.14)² = 4 × 9.8596 = 39.44
∴ T² = 39.44R³/Gm
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Number 6
(6a)
A hard magnetic material is a material that is difficult to magnetize but retains its magnetism for a long time after being magnetized.
(6b)
Brownian motion.
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Number 7
(7)
u = 30 ms⁻¹, Range R = 75 m, g = 10 ms⁻²
R = u²sin2θ/g
75 = (30)²sin2θ/10
75 = 900 sin2θ/10 = 90 sin2θ
sin2θ = 75/90 = 0.833
2θ = sin⁻¹(0.833) = 56.4°
θ = 28.2°
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Number 8
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Number 10
(10a)
(i) Persistence of vision is the ability of the human eye to retain an image for a short time after the object has been removed from sight.
(ii) Accommodation is the ability of the eye lens to change its shape or focal length so that clear images of objects at different distances can be formed on the retina.
(10b)
(i) Both the human eye and the camera use a lens to form an image.
(ii) In the human eye, images are formed on the retina, while in a camera, images are formed on a film or light-sensitive sensor.
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