MCQ & Extra Questions: A Journey through States of Water | Science Class 6 PDF Download

Extra Questions

Q1: What is evaporation?

Evaporation is the process of conversion of water into its vapor state. It takes place continuously, even at room temperature.

Q2: What causes the cooling effect in an earthen pot?

The cooling effect in an earthen pot is caused by water seeping through the surface of the pot and evaporating. This evaporation process imparts a cooling effect on the water inside the pot.

Q3: What happens to the shape of ice when it is placed in different containers?

Ice retains its shape irrespective of the container.

Q5: What is condensation?

Condensation is the process of conversion of water vapor into its liquid state when it comes in contact with a cold surface, forming water droplets.

Q6: How does water change its state from solid to liquid and from liquid to gas?

Water changes its state from solid (ice) to liquid (water) when heat is supplied, and from liquid to gas (water vapour) on further heating.

Q7: Why do clothes dry faster on a windy day?

Clothes dry faster on a windy day because the movement of air increases the rate of evaporation of water from the clothes.

Q8: What causes the water droplets to appear on the outer surface of a cold glass tumbler?

The water droplets appear due to condensation, where water vapor in the air cools down and changes into liquid water on the cold surface.

Q9: What are the three states of water? Describe them briefly.

Water exists in three states: solid (ice), liquid (water), and gas (water vapour). Ice retains its shape, water takes the shape of its container, and water vapour spreads out in the entire available space.

Q10: How does the water cycle work?

The water cycle works through a continuous process of evaporation, condensation, and precipitation. Here’s how it works:

• Evaporation: Water from the ocean, lake, and other water bodies evaporates into the atmosphere as water vapour.
• Condensation: The water vapour cools and condenses to form clouds.
• Precipitation: Water returns to the Earth's surface as rain, hail, or snow.
• Collection: The precipitation collects in rivers, and groundwater, and eventually flows back to the ocean, where the cycle begins again.

This circulation of water helps maintain the balance and availability of water on Earth.

Multiple Choice Questions

Q1: What is the process called when water changes from a liquid to a gas?
a) Freezing
b) Condensation
c) Melting
d) Evaporation
Ans: d) Evaporation

Evaporation is the process where water changes from a liquid state to a gaseous state.

Q2: Which state of water takes the shape of the container it is in?
a) Solid
b) Liquid
c) Gas
d) Plasma
Ans: b) Liquid

Liquid water takes the shape of the container it is in while maintaining a constant volume.

Q3: What happens to water when it is placed in a freezer?
a) It evaporates
b) It condenses
c) It melts
d) It freezes
Ans: d) It freezes

Water turns into ice, a solid state, when placed in a freezer.

Q5: Which of the following is NOT a state of water?
a) Solid
b) Liquid
c) Gas
d) Plasma
Ans: d) Plasma

Water commonly exists in solid, liquid, and gas states; plasma is not a state of water.

Q6: What forms when water vapour condenses in the atmosphere?
a) Ice
b) Clouds
c) Salt
d) Dust
Ans: b) Clouds

Clouds form when water vapour condenses around dust particles in the atmosphere.

Q7: Which factor does NOT directly affect the rate of evaporation?
a) Humidity
b) Temperature
c) Surface area
d) Color of water
Ans: d) Color of water

The rate of evaporation is affected by temperature, humidity, and surface area, but not by the color of water.

Q8: What do you observe when you pour water on a clean surface?
a) It evaporates instantly
b) It forms a puddle
c) It solidifies
d) It changes colour
Ans: b) It forms a puddle

Water forms a puddle on a clean surface and spreads out based on the surface’s properties.

Q9: When water in a puddle disappears, what is the most likely cause?
a) Seeping into the ground
b) Chemical reaction
c) Evaporation
d) Absorption by plants
Ans: c) Evaporation

The most likely cause of a puddle disappearing is evaporation, where water changes into vapor due to heat and then escapes into the air.

Q10: Why does water evaporate faster from a wide plate compared to a small cap?
a) The plate has more water
b) The plate is exposed to more sunlight
c) The plate has a larger exposed surface area
d) The cap is warmer
Ans: c) The plate has a larger exposed surface area

Water evaporates faster from a wide plate because it has a larger surface area exposed to air, allowing more water to change into vapor at once.