With reference to the drying of wet roads after rain, consider the following: 1. The water disappears due to evaporation. 2. Evaporation occurs only in the presence of direct sunlight. 3. The water vapour formed settles immediately as dust. Which of the statements given above is/are correct?

The correct option is (a) 1 only. Explanation Evaporation is a physical process within the environment where a liquid turns into a gas (vapour). It is a surface phenomenon that occurs at temperatures below the boiling point of the liquid. This process is a crucial part of the water cycle, facilitating the movement of water from the lithosphere and hydrosphere to the atmosphere. Statement-wise Analysis - Statement 1 is Correct: The drying of wet roads is primarily caused by evaporation. During this process, liquid water on the road surface absorbs heat energy from the surroundings (air, ground, or sun) and converts into water vapour, thereby disappearing from the surface. - Statement 2 is Incorrect: Evaporation does not require direct sunlight. It is a continuous process that occurs at any time of the day or night, provided the air is not saturated with moisture. While direct sunlight accelerates the process by providing more heat energy, evaporation also occurs in the shade or during the night using heat from the atmosphere or the ground. - Statement 3 is Incorrect: Water vapour is water in a gaseous state. Once formed, it rises and mixes with the surrounding air (atmosphere). It does not settle as dust. Dust consists of solid particulate matter, whereas water vapour is a gas that may eventually condense to form clouds or dew, but it does not transform into dust. Key Takeaway Evaporation is the conversion of liquid water into water vapour driven by heat energy. It is a continuous environmental process influenced by factors such as temperature, surface area, humidity, and wind speed, and does not strictly depend on the presence of direct sunlight.

With reference to the drying… - NCERT Class 6 Environment & Ecology MCQ

NCERT Class 6 Environment & Ecology — Chapter 1: Water

mcqeasy

With reference to the drying of wet roads after rain, consider the following:

The water disappears due to evaporation.
Evaporation occurs only in the presence of direct sunlight.
The water vapour formed settles immediately as dust.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 6 · Page 138

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (a) 1 only.

Explanation

Evaporation is a physical process within the environment where a liquid turns into a gas (vapour). It is a surface phenomenon that occurs at temperatures below the boiling point of the liquid. This process is a crucial part of the water cycle, facilitating the movement of water from the lithosphere and hydrosphere to the atmosphere.

Statement-wise Analysis

Statement 1 is Correct: The drying of wet roads is primarily caused by evaporation. During this process, liquid water on the road surface absorbs heat energy from the surroundings (air, ground, or sun) and converts into water vapour, thereby disappearing from the surface.
Statement 2 is Incorrect: Evaporation does not require direct sunlight. It is a continuous process that occurs at any time of the day or night, provided the air is not saturated with moisture. While direct sunlight accelerates the process by providing more heat energy, evaporation also occurs in the shade or during the night using heat from the atmosphere or the ground.
Statement 3 is Incorrect: Water vapour is water in a gaseous state. Once formed, it rises and mixes with the surrounding air (atmosphere). It does not settle as dust. Dust consists of solid particulate matter, whereas water vapour is a gas that may eventually condense to form clouds or dew, but it does not transform into dust.

Key Takeaway

Evaporation is the conversion of liquid water into water vapour driven by heat energy. It is a continuous environmental process influenced by factors such as temperature, surface area, humidity, and wind speed, and does not strictly depend on the presence of direct sunlight.

Your note

More from Chapter 1: Water

What happens to the water that falls on land as rain and snow? 1. Most of it ultimately flows back to the oceans. 2. None of the rainwater seeps into the ground. 3. It remains permanently on the land surface to form lakes. Select the correct answer using the code given below:

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How does rapid industrialization primarily affect freshwater availability?

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With reference to heavy rains and floods, consider the following statements: 1. Heavy rains can lead to a rise in the water level of rivers and lakes. 2. Floods are generally beneficial for the survival of soil-dwelling animals. 3. Animals living in water can get carried away to land areas during floods and die when water recedes. Which of the statements given above is/are correct?

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What causes the formation of water droplets on the outer surface of a container filled with ice-cold water?

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Which of the following factors contribute to the decreasing availability of usable water? 1. Rising population. 2. Industries consume a negligible amount of water compared to domestic use. 3. Food production requires no water resources. Select the correct answer using the code given below:

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