NCERT Class 6 Environment & Ecology — Chapter 1: Water

mcqeasy

Which of the following phenomena is a direct result of the process of condensation?

Official previous-year question

Verified 1 Aug 2026.

Options

AThe loss of water vapour from plant leaves.
BThe drying of wet clothes in the wind.
CThe disappearance of water spilled on a floor.
DThe formation of water droplets on the outer surface of a cold glass.

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Solution

Correct Option

The correct option is

The formation of water droplets on the outer surface of a cold glass.

Explanation

Condensation is the physical process wherein matter transitions from a gaseous state to a liquid state. In the context of the environment and the hydrological cycle, this occurs when water vapour in the atmosphere loses thermal energy (cools down) and converts into liquid water.

Option Analysis

The drying of wet clothes in the wind. is Incorrect: The drying of wet clothes involves the conversion of liquid water into water vapour. This process is known as evaporation.
The disappearance of water spilled on a floor. is Incorrect: The disappearance of water spilled on a floor is caused by evaporation, where liquid water absorbs heat from the surroundings and transitions into a gaseous state.
The formation of water droplets on the outer surface of a cold glass. is Correct: When ambient air containing water vapour comes into contact with the cold surface of a glass, the vapour loses heat energy. This reduction in temperature causes the gas to change its state into liquid water droplets, which is the definition of condensation.
The loss of water vapour from plant leaves. is Incorrect: The loss of water vapour from the aerial parts of plants (leaves) is a biological process known as transpiration.

Key Takeaway: Condensation is the reverse process of evaporation. It requires a loss of heat and is responsible for phenomena such as the formation of clouds, dew, and fog.

Your note

More from Chapter 1: Water

With reference to the process of evaporation in the water cycle, consider the following statements: 1. Evaporation of water can take place even in the shade. 2. Water vapour formed during evaporation carries dissolved salts with it into the atmosphere. 3. Warm air can provide the necessary heat for evaporation to occur in shaded areas. Which of the statements given above is/are correct?

medium

Which process explains the drying of a wet surface even in the absence of direct sunlight?

easy

Consider the following statements regarding the loss of water by plants: 1. Plants release water into the air through the process of condensation. 2. Plants release a significant amount of water into the air. 3. Transpiration plays a role in adding water vapour to the atmosphere. Which of the statements given above is/are correct?

medium

With reference to the sources of water vapour in the atmosphere, consider the following statements: 1. Water vapour is added to the air exclusively by the evaporation of water from oceans and lakes. 2. Evaporation from water bodies is a major source of water vapour in the air. 3. Transpiration by plants does not contribute to the water vapour in the air. Which of the statements given above is/are correct?

easy

Consider the following statements regarding the rate of evaporation: 1. Evaporation is generally a slow process. 2. Evaporation occurs at the same rate in sunlight and in the shade. 3. Heating water on a burner increases the rate of evaporation. Which of the statements given above are correct?

easy

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Correct Option

The correct option is

The formation of water droplets on the outer surface of a cold glass.

Explanation

Option Analysis

The drying of wet clothes in the wind. is Incorrect: The drying of wet clothes involves the conversion of liquid water into water vapour. This process is known as evaporation.
The disappearance of water spilled on a floor. is Incorrect: The disappearance of water spilled on a floor is caused by evaporation, where liquid water absorbs heat from the surroundings and transitions into a gaseous state.
The formation of water droplets on the outer surface of a cold glass. is Correct: When ambient air containing water vapour comes into contact with the cold surface of a glass, the vapour loses heat energy. This reduction in temperature causes the gas to change its state into liquid water droplets, which is the definition of condensation.
The loss of water vapour from plant leaves. is Incorrect: The loss of water vapour from the aerial parts of plants (leaves) is a biological process known as transpiration.

Key Takeaway: Condensation is the reverse process of evaporation. It requires a loss of heat and is responsible for phenomena such as the formation of clouds, dew, and fog.