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NABTEB Physics Past Questions with Solutions.

Published on Aug 21, 2025 • Education

Introduction

Welcome to this class! Today we’ll be working through the top NABTEB Physics past questions with solutions. These questions are not only important for NABTEB but also relevant for WAEC, JAMB, and IGCSE Physics exam preparation. Let’s dive in.

Let’s get started with the questions and answers.

Question 1 – Sources of Surface Tension in a Liquid

The first question says: Explain the sources of surface tension in a liquid.

Explanation of Surface Tension

Surface tension is the ability of a liquid to behave like an elastic sheet. It allows small, light substances to float on the surface of the liquid even when they are denser than the liquid beneath.

For instance, if you place a very light object such as a needle or insect on water, it can rest on the surface without sinking. This happens because the liquid molecules at the surface experience cohesive forces that pull them together, creating a “film” effect.

Molecular View

• Molecules inside the liquid experience equal forces from all directions.
• Molecules at the surface, however, experience a net inward pull because there are no molecules above them to balance the forces.
• This imbalance creates a contracting force at the surface, which is what we call surface tension.

Real-Life Examples of Surface Tension

• Floating of insects like the water strider on ponds
• Formation of droplets of water
• Capillary action in thin tubes (important in plant transport systems)

Exam Tip

In Physics exams like NABTEB and WAEC, always use both molecular explanation and real-life applications to score full marks in descriptive questions.

Watch the full tutorial here: https://www.youtube.com/watch?v=-U33inpehqY&t=33s

Conclusion

Surface tension arises due to molecular cohesion at the liquid-air interface. It gives liquids their elastic property, explains phenomena such as capillary rise, droplet formation, and floating of light objects. Mastering this concept is essential for excelling in NABTEB, WAEC, and JAMB Physics exams.

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