WAEC Physics Past Questions, Answers, And Explanations - Physics

Waec Physics Questions

Question 636:

WAEC 1998

Use the following data to determine the length L of a wire when a fore of 30N is applied, assuming Hooke's law is obeyed
\(\begin{array}{c|c}\text{Force applied/N} & 0 & 5 & 10 & 30\\ \hline \text{length of wire/mm} & 500.0 & 500.0 & 501.0 & L \end{array}\)

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A 3.0mm
B 3.5mm
C 503.00mm
D 503.5mm
E 506.0mm

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Question 637:

WAEC 1998

Which of the following explains the concave meniscus of water in a clean glass tube? the

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A Adhension between water and glass molecules is greater than the sdhension between water molecules
B Cohension between water molecules is greater then the adhension between glass and water molecule
C Molecules of water near the glass move faster than the molecules at the centre of the tube
D Molecules of water at the water-air boundary are often attracted to the centre of the tube
E Weight of the water pulls the centre part of the surface down

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Question 638:

WAEC 1998

An electron is accelerated from rest through a potential difference of 70kV in a vacuum. Calculate the maximum speed acquired by the electron (electronic charge = -1.6 x 10^-19; mass of an electron = 9.1 x 10^-31kg)

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