WAEC 2021 - PHYSICS ANSWER


PHYSICS OBJ:
1-10: AAABACCDDB
11-20: ACCDCBCBAC
21-30: CCCBBDDBBB
31-40: ACBBCCCAAD
41-50: ABADCCBAAC


PART I
Answer ANY FIVE from this part


(1 & 2)


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(3 & 4)


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(6)
(i) Reflection
(ii) Refraction
(iii) Diffraction

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(7a)
The scientific principle underlying the operation of a fibre optics is the principle of total internal reflection by which light signals can be transmitted from one place to another with a negligible loss of energy.

(7bi)
Core: The core is the light transmission area of the fibre, either glass or plastic cladding. The function of the cladding is to provide a lower refractive index at the core interface in order to cause reflection within the core so as to enable light waves transmitted through the fibre.

(7bii)
Cladding: It functions as a gadget that provides a clear refractive index at the core interface in order to cause reflection within the core so that light waves are transmitted through the fibre.

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PART II
Answer ANY THREE from this part


(8)



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(9)




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(11)