Practice Questions

<p>Identify the state of water that has a fixed volume but takes the shape of its container.</p>

<p>Describe what happens when an ice cube is left in a cup on a table at room temperature.</p>

<p>Define the term &#39;evaporation&#39; in the context of water.</p>

<p>Name the three different states in which water can be observed in our daily life.</p>

<p>Identify which of the following is an example of water in its solid state in nature: (i) river water, (ii) ocean water, (iii) glaciers, (iv) water vapour in air.</p>

<p>What is meant by the term &#39;humidity&#39;?</p>

<p>Define the process of &#39;freezing&#39; in relation to water.</p>

<p>What is the process of conversion of a solid substance into its liquid state called?</p>

<p>Identify the process by which water vapour present in the air converts into tiny water droplets on a cold surface.</p>

<p>Compare the properties of water in its solid state (ice) and its liquid state. Focus on shape and ability to flow.</p>

<p>Demonstrate your understanding of the term &#39;evaporation&#39; by providing two everyday examples where you observe water disappearing due to this process.</p>

<p>Describe two distinct properties of water in its liquid state.</p>

<p>During the winter season, coconut oil often changes from a liquid to a solid state. What is the scientific term for this change of state?</p>

<p>What happens to the state of candle wax when a lit candle melts? Describe the process involved.</p>

<p>Give an example of a substance, other than water, that can change from a solid to a liquid state upon heating.</p>

<p>Aavi noticed that when milk is boiled in a half-filled utensil and covered with a steel plate, water drops accumulate on the inner side of the plate. Analyze where these water drops originate from.</p>

<p>Recall how clouds are generally formed in the atmosphere.</p>

<p>Explain why water from puddles on a playground disappears after some time.</p>

<p>List three conditions that can affect how fast water will evaporate.</p>

<p>Aavi&#39;s mother uses an earthen pot (matka) to store drinking water in summer. Analyze why the water in the earthen pot remains cooler than water stored in a stainless steel pot, even without refrigeration.</p>

<p>Contrast the process of evaporation with the process of condensation.</p>

<p>Analyze why dew drops are often observed on plant leaves in the early morning, especially after a clear, cool night.</p>

<p>Summarize the main stages of the water cycle.</p>

<p>Explain why water droplets appear on the outer surface of a glass tumbler containing ice-cold water.</p>

<p>Explain how an earthen pot (matka) keeps water cool during summer.</p>

<p>Imagine you have two identical wet towels. You hang one in a sunny, windy spot and the other in a shaded, still corner. Analyze which towel will dry faster and explain the reasons for this difference, applying the concepts of evaporation.</p>

<p>When you take a glass of ice-cold water out of the refrigerator, water droplets quickly appear on its outer surface. Analyze the source of these water droplets.</p>

<p>Examine the effect of rubbing hand sanitiser on your hands. Why do your hands feel cool after applying it?</p>

<p>Apply your understanding of the water cycle to explain how an Atmospheric Water Generator (AWG) machine produces drinkable water from humid air.</p>

<p>Thirav wonders if the water from puddles disappears only by seeping into the ground. Design a simple activity to investigate if evaporation also plays a role in the disappearance of water from puddles.</p>