Science Class 6 Curiosity Chapter 8 Question Answer

A Journey through States of Water

Question 1.  Which of the following best describes condensation?

(i) The conversion of water into its vapour state.
(ii) The process of water changing from a liquid into gaseous state.
(iii) The formation of clouds from tiny water droplets.
(iv) The conversion of water vapour into its liquid state.

Answer: (iv) The conversion of water vapour into its liquid state describes condensation.

Question 2. Identify in which of the given processes, evaporation is very important-

(i) Colouring with

(a) crayons
(b) water colours
(c) acrylic colours
(d) pencil colours

(ii) Writing on paper with

(a) pencil
(b) ink pen
(c) ball point pen

Answer:
(i) (b) water colours (evaporation is important as water dries to leave the colour)
(ii) (b) ink pen (evaporation helps the ink dry on the paper)

Question 3. We see green coloured plastic grass at many places these days. Space around natural grass feels cooler than space around the plastic grass. Can you find out why?

Answer: Natural grass cools the surrounding area through evaporation, which absorbs heat, while plastic grass lacks this process.

Question 4. Give examples of liquids other than water, which evaporate.

Answer: Milk, perfume, whisky, petrol, sanitizer.

Question 5. Fans move air around, creating a cooling sensation. It might seem strange to use a fan to dry wet clothes since fans usually make things cooler, not warmer. Normally, when water evaporates, it requires heat, not cold air. What do you think about this?

Answer: Fans increase the air movement around wet clothes, speeding up the evaporation of water. The moving air helps remove the moisture faster, even though fans cool the surroundings​.

Question 6. Usually, when sludge is removed from drains, it is left in heaps next to the drain for 3-4 days. Afterward, it is transported to a garden or a field where it can be used as manure. This approach reduces transportation cost of the sludge and enhances the safety of individuals handling it. Reflect upon it and explain how.

Answer: Leaving sludge in heaps allows some water to evaporate, reducing its weight and volume. This makes transportation easier and safer while cutting costs.

Question 7. Observe the activities in your house for a day. Identify the activities that involve evaporation. How does understanding the process of evaporation help us in our daily activities? 

Answer: We perform various activities where process of evaporation help us.

Drying clothes: Faster when spread out and exposed to wind or sunlight.

Cooking: Water evaporates while boiling.

Sweating: Helps cool the body as sweat evaporates​

Question 8. How is water present in the solid state in nature?

Answer: Ice, snow, and glaciers​ are the solid state of water present in nature.

Question 9. Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.

Answer: Water is essential for life, and its availability is limited. It is our duty to conserve and protect it before we think of it as an unlimited resource that we are entitled to. Responsible use ensures future generations will have access to clean water​

Question 10. The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?

Answer:  To cool down the hot seat of a two-wheeler parked on a sunny day, we can:

• We can cool the seat by covering it with a damp cloth. As the water evaporates, it absorbs heat from the seat, making it cooler
• Sprinkle water on it: Lightly sprinkle water directly on the seat. The evaporating water will help to lower the temperature.
• Use a sunshade or cover: If available, use a sunshade or seat cover to protect the seat from direct sunlight, which will help keep it cooler.