2021 NECO PHYSICS OBJ & THEORY QUESTIONS AND ANSWERS 

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PHYSICS OBJ
1-10: BCEDBECBAD
11-20: DEDCBEDCEA
21-30: DDAEBBCBBC
31-40: CEDBBCBEAE
41-50: BDEEDECCCD
51-60: BEECECDBCB
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(1)

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(7a)
This is because sound waves are mechanical in nature and requires material medium for their propagation

(7i)
When the refracted angle is 90° or when the incident ray do not undergo reflection, no refraction passes through the boundary between the two media.

(7ii)
Light must be travelling from an optically dense medium to an optically less dense medium

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(12)

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(16)

2021 Neco expo physics obj and theory questions & Answers
2021 Neco expo physics obj and theory questions & Answers
2021 Neco expo physics obj and theory questions & Answers
2021 NECO PHYSICS OBJ & THEORY QUESTIONS AND ANSWERS
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