The correct answer is (a) humidity is high in air. During the rainy season, the air contains more water vapor, which increases humidity. This reduces the rate of evaporation because the air is already saturated with moisture, limiting further evaporation.
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The correct answer is (d) all of these. Solids, liquids and gases differ in particle arrangement, attractive forces and spaces between particles. Solids have tightly packed particles with strong forces, liquids have moderate spacing and gases have widely spaced particles ...
The correct answer is (c) solid CO₂. Dry ice is the solid form of carbon dioxide (CO₂). It sublimates directly into gas at room temperature without passing through the liquid phase, making it useful for cooling and creating fog effects.
The Kelvin temperature is found by adding 273 to the Celsius temperature. Thus, 25°C = 298 K, 38°C = 311 K, and 66°C = 339 K, making option (a) the correct choice. Class 9th Science NCERT MCQ Questions NCERT Books ...
The correct answer is (c) Gases and liquids behave like fluids. Fluids are substances that can flow and take the shape of their container. Both gases and liquids exhibit this property because their molecules can move freely, unlike solids, which ...