WAEC 2021 Physics | Essay

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Question 1 View Details
The load - extension graph of a elastic material is illustrated below. Use the graph to determine the work done in stretching the material.
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Question 2 View Details
Name two artificial satellites.
Question Parts
(a)
Name two artificial satellites.
(b)
A geostationary satellite moves in an orbit of radius \( 6300 \text{ km} \). Calculate the speed with which it moves in the orbit. \([\pi=22 / 7]\).
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Question 3 View Details
A projectile is fired at an angle 30° to the horizontal with a velocity of 4 \( \mathrm{ms}^{-1} \). Calculate the velocity attained after \( 1 \text{ s} \). \( \left[g=10 \text{ m s}^{-2}\right] \).
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Question 4 View Details
The circuit diagram below is a simple current rectifier circuit. Use it to answer the questions that follow.
Question Parts
(a)
State the function of each of the parts labelled \( A \) and \( B \).
(b)
Sketch the output signal produced.
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Question 5 View Details
Explain wave-particle duality of light.
Question Parts
(a)
Explain wave-particle duality of light.
(b)
A particle of wavelength \( 4.2 \times 10^{-11} \) travels with a momentum of \( 1.6 \times 10^{23} \mathrm{kgm}^{-1} \). Determine the value of Planck's constant, \( h \).
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Question 6 View Details
State three observable phenomena where a particle behaves like a wave.
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Question 7 View Details
State the scientific principle underlying the operation of fibre optics.
Question Parts
(a)
State the scientific principle underlying the operation of fibre optics.
(b)
Explain each of the following terms as used in fibre optics:
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Question 8 View Details
State Hooke's law.
Question Parts
(a)
(i) State Hooke's law.
(b)
(ii) A spring has a length of \( 0.20 \text{ m} \) when a mass of 0.30 kg hangs on it and a length of \( 0.75 \text{ m} \) when a mass of 1.95 \( ext{ kg} \) hangs on it. Calculate the:
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Question 9 View Details
What is Dew point?
Question Parts
(a)
(i) What is Dew point?
(b)
(ii) Explain why dew forms more quickly on metal parts than rubber parts.
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Question 10 View Details
Define each of the following terms as it relates to converging lenses:
Question Parts
(a)
(i) Define each of the following terms as it relates to converging lenses: I. focal length; II. Optical centre.
(b)
(ii) Draw a ray diagram to illustrate how a converging lens is used to produce a virtual image of an object.
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Question 11 View Details
What is meant by the root - mean square value of an alternating current?
Question Parts
(a)
(i) What is meant by the root - mean square value of an alternating current?
(b)
(ii) Define impedance of an alternating current circuit.
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Question 12 View Details
State the principal factor that determines the relative stability of a radioactive nucleus.
Question Parts
(a)
(i) State the principal factor that determines the relative stability of a radioactive nucleus.
(b)
(ii) Arrange the following radionuclides in decreasing order of stability. Justify your answer: \( { }_{20}^{40} \mathrm{X},{ }_{36}^{92} \mathrm{~W} \) and \( { }_{42}^{95} \mathrm{~Y} \).
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