WAEC 2026 PHYSICS ANSWERS (OBJ & ESSAY)

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PHYSICS OBJ
01-10: DBDCABDDBC
11-20: ACABCDCCDB
21-30: DABACDABCB
31-40: ACBAADADCD
41-50: ACBBCBAABA

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(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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(2ai)
Holes

(2aii)
Electrons

(2b)
It requires no heating/filament, so it operates at room temperature and consumes less power.
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(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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(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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(5)

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(6a)
A hard magnetic material is one that is difficult to magnetise but retains its magnetism permanently once magnetised (e.g. steel, alnico).

(6b)
Photoelectric effect; light ejects electrons from a metal surface, showing light behaves as particles (photons).
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(7)

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