Q7 (NDA-I/2015) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Thermal physics Answer Verified

Statement I : While putting clothes for drying up, we spread them out. Statement I : The rate of evaporation increases with an increase in surface area.

Both the statements are individually true and Statement II is the correct explanation of Statement I

Both the statements are individually true but Statement II is not the correct explanation of Statement I

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Result

Your answer: — · Correct: A

Explanation

Statement I is true as spreading clothes is a common practice to ensure they dry quickly [2]. Statement II is also true because evaporation is a surface phenomenon; increasing the surface area allows more water molecules to escape into the air simultaneously [2]. When clothes are spread out, the exposed surface area increases, which directly accelerates the rate of evaporation compared to when they are crumpled [2]. This increased exposure also facilitates better air circulation, allowing saturated air near the fabric to be replaced by unsaturated air, further aiding the drying process [1]. Therefore, Statement II provides the scientific reasoning for the action described in Statement I, making it the correct explanation. Other factors influencing this process include temperature, humidity, and wind speed [3].

Sources

[2] Science-Class VII . NCERT(Revised ed 2025) > Chapter 7: Heat Transfer in Nature > FASCINATING FACTS > p. 98
[1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 24: Hydrological Cycle (Water Cycle) > Factors Affecting Rate of Evaporation > p. 328
[3] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 10: Water in the Atmosphere > EVAPORATION AND CONDENSATION > p. 86

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Statement I : While putting clothes for drying up, we spread them out. Statement I : The rate of evaporation increases with an increase in surface area.

Explanation

SIMILAR QUESTIONS

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