Class 6 Science Chapter 11 Different States of Water

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Class 6 Science Chapter 11 Different States of Water

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Different States of Water

Chapter: 11

PART – II

EXERCISE

1. Darken the circle of correct answers-

(i) The main reason of cloud formation is-

(a) Evaporation.

(b) Condensation.

(c) Precipitation.

(d) Evaporation or condensation.

Ans: (d) Evaporation or condensation.

(ii) What happens due to condensation?

(a) Conversion of water into water vapour.

(b) Conversion of water vapour into water.

(c) Cloud formation from droplets of water.

(d) Raining from clouds.

Ans: (b) Conversion of water vapour into water.

(iii) What happens due to evaporation?

(a) Conversion of water vapour into water.

(b) Conversion of water into water vapour.

(c) Conversion of water into ice.

(d) Cloud formation from water droplets.

Ans: (b) Conversion of water into water vapour.

2. Fill up the gap-

(i) The process of drying wet clothes in sunlight is __________.

Ans: Evaporation.

(ii) The solid state of water is _________ and the gaseous state of _________.

Ans: Ice, Water vapour.

(iii) When the atmosphere becomes cry cold, the water droplets are converted into __________.

Ans: Ice.

(iv) The state of water which does not change its shape is ___________.

Ans: Solid.

(v) Dew is formed due to __________.

Ans: Condensation.

3. To which process the following events are connected (Evaporation or Condensation)

(i) If water is splashed on a hot iron bar, water vapour emerges out.

Ans: Evaporation.

(ii) Drops of water appear on the surface of a glass tumbler containing water with ice cubes.

Ans: Condensation.

(iii) Water or other food items remain fresh for many days when kept in either earthen pot or earthen cooler.

Ans: Evaporation.

(iv) The water kept in earthen pitcher remains cooler than the water in metallic pot.

Ans: Evaporation.

4. Explain briefly the reasons of the following statements.

(i) During rainy days or in winter season, it is observed that the windshield and the window of a close vehicle become smoky.

Ans: Because water vapor condenses on the cold glass surface, forming fog or dew droplets.

(ii) During winter either the rate of rain is lower or rain does not occur as expected.

Ans: Cold air holds less moisture, so less evaporation occurs, leading to fewer clouds and rain.

(iii) Water vapour emerges out when iron is used on wet clothes.

Ans: The heat from the iron causes water to evaporate from the wet clothes.

(iv) When roti is prepared on a pan it puffs up.

Ans: Water inside the dough evaporates into vapor, causing the roti to puff.

(v) Wet clothes dry up when it is kept beneath the fan.

Ans: The fan increases air movement, speeding up evaporation of water from clothes.

5. Explain:

(i) Water droplets appear on the surface of a water bottle if it is brought out from a refrigerator.

Ans: Water droplets appear on the surface of a water bottle when it is taken out of the refrigerator because the bottle is colder than the surrounding air. The cold surface cools the moisture (water vapor) present in the air around it, causing the vapor to condense into tiny water droplets on the bottle’s surface.

(ii) Water cycle does not occur without evaporation and condensation.

Ans: The water cycle depends on evaporation and condensation to work properly. Evaporation changes water from oceans, rivers, and lakes into vapor that rises into the air. Condensation then cools this vapor, turning it into tiny droplets that form clouds. Without these two processes, water cannot move from the surface to the atmosphere and back, so the water cycle would stop.

6. Why do we see dew on the leaves of plants during winter?

Ans:  Dew forms because water vapor condenses into liquid droplets on the cold surface of leaves during winter mornings.

7. Why does surface water dry up under the sunlight?

Ans: Surface water dries up under sunlight because the heat from the sun causes evaporation. During evaporation, water absorbs heat and changes into water vapor, which rises into the air, making the water disappear from the surface.

8. Write the name of a substance which we can get in three states as in water.

Ans: Like water, substances such as wax and oil can exist in three states solid, liquid, and gas. For example, wax is solid at room temperature, melts into liquid on heating, and can vaporize into gas on further heating.

9. What are the factors that affect evaporation?

Ans: The factors that affect evaporation are:

(i) Temperature: Higher temperatures, like on a sunny day, increase the rate of evaporation.

(ii) Wind: Windy conditions help remove water vapor from the surface, making evaporation faster.

(iii) Humidity: When humidity is high, as on a rainy day, evaporation slows down because the air already contains a lot of water vapor.

(iv) Exposed surface area: More surface area exposed to air leads to faster evaporation.

10. Why do our hands feel cold when we apply hand sanitizer?

Ans: Hand sanitizer contains alcohol, which evaporates quickly when applied to the skin. During evaporation, the alcohol molecules absorb heat from the skin and surrounding air to change from liquid to gas. This absorption of heat cools the skin, making your hands feel cold after applying sanitizer.