Q1: Why does the paper remain dry even when the cup with paper is submerged in water?
As air in the cup occupies space and cannot escape, water cannot enter the cup to displace the air. Hence, the crushed paper will remain dry.
Q2: The water level in the cup rises slightly. Why is it so?
Air trapped in the cup can be compressed slightly, so some water can enter the inverted cup, causing the water level in the cup to rise slightly.
When the cup is slanted, air can escape from the cup, hence some water can enter to displace the air.
Want to learn more on science application and the technique to answer exam questions? Here are our recommended titles. Check them out!
PSLE Science Revision Guide
Science Revision Guide Primary 5&6 (2nd Edition) and Primary 3&4
Science Revision Guide is the most complete handbook developed to prepare pupils for success in Science revision. Features of this book are especially designed to help pupils develop a deeper understanding of key Science concepts and to guide them to master the application of process skills.
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