Worksheet Solutions: The Water Cycle | General Knowledge for Young Learners - Class 1 PDF Download

Section A: Multiple Choice Questions

Q1: What is the water cycle?
(a) A cycle of water turning into ice
(b) A cycle of water evaporating and condensing in the atmosphere
(c) A cycle of water flowing in rivers and lakes
(d) A cycle of water disappearing from the Earth

Ans: (b)
Explanation: The water cycle is a continuous process in which water evaporates from the Earth's surface, rises into the atmosphere, condenses into clouds, and falls back to the Earth as precipitation.

Q2: Which process of the water cycle involves water turning into vapor?
(a) Evaporation
(b) Condensation
(c) Precipitation
(d) Collection

Ans: (a)
Explanation: Evaporation is the process in which water changes from a liquid to a gas or vapor. It occurs when the sun heats up water bodies like lakes, rivers, and oceans, causing the water to evaporate and turn into water vapor.

Q3: What happens during condensation?
(a) Water vapor turns into water droplets
(b) Water droplets turn into water vapor
(c) Water evaporates into the atmosphere
(d) Water falls from the clouds as rain

Ans: (a)
Explanation: During condensation, water vapor in the atmosphere cools down and turns into water droplets. These water droplets then gather together to form clouds.

Q4: What is precipitation?
(a) The process of water turning into vapor
(b) The process of water evaporating from plants
(c) The process of water falling from the atmosphere to the Earth's surface
(d) The process of water condensing in the atmosphere

Ans: (c)
Explanation: Precipitation refers to the process in which water, in the form of rain, snow, sleet, or hail, falls from the clouds to the Earth's surface.

Q5: What is an example of precipitation?
(a) Water evaporating from a lake
(b) Water dripping from a faucet
(c) Rain falling from the clouds
(d) Water turning into ice

Ans: (c)
Explanation: Rainfall is an example of precipitation, which occurs when water droplets in the clouds join together and become heavy enough to fall to the ground under the force of gravity.

Section B: Short Questions

Q1: Define evaporation and give an example.

Ans: Evaporation is the process in which water changes from a liquid to a gas or vapor. It occurs when the sun heats up water bodies like lakes, rivers, and oceans, causing the water to evaporate. Example: When a puddle of water dries up on a hot sunny day, it is due to evaporation.

Q2: Explain the process of condensation.

Ans: Condensation is the process in which water vapor in the atmosphere cools down and turns into water droplets. It occurs when warm air rises and cools, causing the water vapor to condense and form clouds. These clouds can later release the water as precipitation.

Q3: Name three sources of water for the water cycle.

Ans: Three sources of water for the water cycle are:
(a) Oceans: Oceans cover a large part of the Earth's surface and provide a vast amount of water for evaporation.
(b) Rivers and lakes: Rivers and lakes also contribute to the water cycle as water from these sources evaporates into the atmosphere.
(c) Groundwater: Groundwater, which is stored underground in aquifers, can also contribute to the water cycle when it seeps to the surface or evaporates from the soil.

Q4: How does water return to the Earth's surface during the water cycle?

Ans: Water returns to the Earth's surface during the water cycle through precipitation. When the water vapor in the atmosphere condenses and forms clouds, it eventually falls back to the Earth as rain, snow, sleet, or hail.

Q5: Why is the water cycle important for the Earth?

Ans: The water cycle is important for the Earth because it helps to maintain the balance of water on our planet. It ensures that water is continuously recycled and redistributed, providing fresh water for plants, animals, and humans. The water cycle also plays a crucial role in regulating the Earth's temperature and climate by transferring heat energy from the Earth's surface to the atmosphere.

Section C: Fill in the Blanks

Q1: Water evaporates from the ___________ and forms clouds.

Ans: oceans
Explanation: Water evaporates from the surface of oceans and other bodies of water and forms clouds in the sky.

Q2: When water vapor cools down, it turns into ___________.

Ans: liquid water
Explanation: When water vapor cools down, it loses heat energy and condenses back into liquid water.

Q3: The process of water vapor turning into liquid water is called ___________.

Ans: condensation
Explanation: Condensation is the process in which water vapor cools down and changes into liquid water.

Q4: When water droplets in clouds join together, they form ___________.

Ans: raindrops
Explanation: Water droplets in clouds can collide and merge to form larger droplets, which eventually fall to the ground as raindrops.

Q5: ___________ is the process of water falling from the atmosphere to the Earth's surface.

Ans: Precipitation
Explanation: Precipitation refers to any form of water that falls from the atmosphere, including rain, snow, sleet, or hail.

Section D: Match the Column

Ans:

Section E: True or False

Q1: The water cycle is a continuous movement of water on Earth.

Ans: True
Explanation: The water cycle refers to the continuous movement of water on Earth, involving processes like evaporation, condensation, and precipitation.

Q2: Water evaporates from the surface of land only.

Ans: False
Explanation: Water evaporates not only from the surface of land but also from oceans, lakes, rivers, and other bodies of water.

Q3: When water vapor cools down, it forms clouds.

Ans: True
Explanation: When water vapor cools down, it condenses to form tiny droplets, which come together to form clouds.

Q4: Precipitation includes only rain.

Ans: False
Explanation: Precipitation includes various forms of water falling from the atmosphere, such as rain, snow, sleet, or hail.

Q5: Transpiration is the release of water vapor by animals.

Ans: False
Explanation: Transpiration is the process by which plants release water vapor into the atmosphere through their leaves.