The question asks for a simple activity that demonstrates air occupies space. We need to evaluate each option based on whether it directly illustrates the property of air taking up volume.
Correct Option: B) Pushing an inverted empty glass/tumbler into water and observing that water does not fill it completely
This activity clearly demonstrates that air, though invisible, takes up space. When the inverted glass is pushed into water, the air trapped inside the glass prevents the water from entering and filling the glass completely. This shows that air has volume and occupies that volume, hence it is a form of matter.
The question asks how dropping a dry piece of brick or clay into water demonstrates the presence of air in these materials. This phenomenon is related to the porous nature of bricks and clay and the displacement of air by water.
A) Bubbles of air escape from the pores of the brick. This is the correct observation. The pores in the brick contain trapped air. When the brick is submerged in water, the water displaces this trapped air, causing it to escape as bubbles. This demonstrates that air was present within the brick.
The question asks to identify the invisible, gaseous substance surrounding Earth that is vital for life. We need to evaluate each option based on its physical state and its role in sustaining life.
Correct Option: B) Air is the invisible, gaseous substance that surrounds the Earth and is essential for the survival of living organisms. It is a mixture of gases, predominantly nitrogen and oxygen, with oxygen being crucial for respiration and carbon dioxide for photosynthesis.
This question tests basic properties of air that can be observed through simple experiments. Filling an empty balloon is a common demonstration used to illustrate certain characteristics of air. We need to analyze what happens when a balloon is filled with air and relate it to the given options.
Correct Option: C) Air occupies space and has weight. When a balloon is filled with air, it inflates, showing that air takes up space. The filled balloon also becomes heavier than an empty one, indicating that air has weight.
The question asks about the properties of air, which is a mixture of gases. We need to identify the statement that accurately describes these properties, considering air as a gaseous substance.
D) It is invisible, has no definite shape, and takes the shape of its container
The question describes a simple experiment demonstrating a fundamental property of air. We need to analyze why the cork/paper remains dry when an inverted glass tumbler is pushed into water, considering the space inside the tumbler.
Correct Option: A) Air occupies space and prevents water from entering the glass. This option accurately explains why the cork/paper stays dry. The air trapped inside the inverted glass acts as a barrier, preventing the water from reaching the bottom of the tumbler.