2020 WAEC Physics Practical Questions And Answers – Guide

WAEC physics practical takes 40% of the total mark obtainable in WASSCE physics examination or NECO or GCE.

So many students are eagerly asking about WAEC physics practical questions and answers. The truth is that nobody can give you the real questions. However, a sincere person can only guide you on what you need to know and how to answer the questions.

The practical has two alternatives (Alternative A and B) and the questions are divided into three categories which are mechanics, light, and electricity.

That said, you also need to know how make a good table of values and how to plot graph in physics for you have a good mark in the practical.

It is not about the questions and answers but there are key things to note that I will provide you with in this article.

Key things to know when answering WAEC physics practical questions

• You must have a composite table showing all the parameters in the question with clear headings (make sure you state the unit in the table and graph)
• Your values must be at least 2 decimal places (d.p). Beware of inconsistent d.p.
• Systematic error, gross error, and disregard of instruction are always penalized
• The axes of your graph must be correctly distinguished
• Use reasonable scale
• You must plot all your points correctly

Likely precautions in WAEC physics practical

Mechanics

• Avoided parallax error in reading stopwatch/clock/metre rule
• Noted/corrected/avoided zero error on stopwatch/clock/metre rule
• Avoided draught
• Avoided conical oscillation
• Ensured that support was rigid
• Ensured bob of pendulum was free from table

Light

• Avoided parallax error in reading metre rule/protractor
• Optical pins inserted vertically
• Reasonable spacing of pins
• Well sharpened pencil used
• Repeated readings shown on table
• Surface of prism cleaned
• Surface of lens cleaned
• Lens kept upright

Electricity

• Key opened in between readings
• Tight connections used
• Avoided parallax error when taking readings on voltmeter or ammeter
• Clean terminal ensured
• Avoided zero error on voltmeter or ammeter
• Repeated readings shown on table

Note: At the end of each question, some questions are asked which will test your theoretical knowledge of physics. In this case, you have to read you textbook well to be able to answer them.

For example

(1) Define dispersion of light? It is the separation of white light into its constituent colours

(2) State the law of conservation of energy? Energy is neither created nor destroyed but can be changed from one form to another

(3) Why is it important to earth electrical appliances? To prevent electric shock

(4) Name two pairs of features in the human eyes and a lens camera that performs similar functions? Retina – film/screen, eye lens – camera lens, iris – diaphragm, pupil – aperture.

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