# WAEC Physics Practical :Key Things You Need To Know.

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 a graph 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 oscillationEnsured 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

Surface of prism cleaned

Surface of lens cleaned

Lens kept upright

Electricity

Tight connections used

Avoid parallax error when taking readings on voltmeter or ammeter

Clean terminal ensured

Avoided zero error on voltmeter or ammeter

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.

I hope this helped

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