Worksheet Solutions: A Journey through States of Water - 1

Multiple Choice Questions (MCQs)

Q1: What is the process of water turning into vapour called?
(a) Condensation
(b) Evaporation
(c) Freezing
(d) Melting
Ans: (b) Evaporation

Evaporation is the process where liquid water changes into water vapor due to heat energy. This occurs when molecules in the liquid gain enough energy to escape into the air as gas.

Q2: Which state of water does not have a fixed shape?
(a) Ice
(b) Water
(c) Water vapour
(d) Both b and c
Ans: (d) Both b and c

Both liquid water (b) and water vapor (c) do not have a fixed shape. Water takes the shape of its container in liquid form, and water vapor is in the gaseous form, which also adapts to the shape of its container.

Q3: What happens to water vapour when it cools down?
(a) It disappears
(b) It condenses into a  liquid
(c) It becomes ice
(d) It evaporates
Ans: (b) It condenses into a liquid

When water vapor cools down, it loses energy and condenses back into liquid form, typically observed as droplets on surfaces like windows or fog.

Q4: Which of the following factors does NOT affect the rate of evaporation?
(a) Temperature
(b) Humidity
(c) Altitude
(d) Surface area
Ans: (c) Altitude

Temperature, humidity, and surface area all influence the rate of evaporation. However, altitude mainly affects air pressure, which has a smaller impact on evaporation compared to the other factors.

Q5: What device collects moisture from humid air to produce drinkable water?
(a) Dehumidifier
(b) Atmospheric Water Generator
(c) Air conditioner
(d) Evaporator
Ans: (b) Atmospheric Water Generator

An Atmospheric Water Generator (AWG) collects moisture from the air and condenses it to produce purified, drinkable water.

Fill in the Blanks

Q1: The process of changing from a solid to a liquid is called __________.
Ans: Melting

Q2: Water vapor is __________ when it cools to form water droplets.
Ans: Condensed

Q3: __________ refers to the amount of water vapor present in the air.
Ans: Humidity

Q4: Ice is the __________ state of water.
Ans: Solid

Q5: Evaporation occurs faster at __________ temperatures.
Ans: Higher

True or False

Q1: Ice and water are the same substance in different states.
Ans: True

Q2: Water vapour is visible in the air.
Ans: False

Q3: Water can change states by adding or removing heat.
Ans: True

Q4: Higher humidity results in drier air.
Ans: False

Q5: Evaporation has a cooling effect on the surroundings.
Ans: True

Match the Following

Ans: