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Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Which one of the following sets of phenomenon would increase on raising the temperature? (a) Diffusion, evaporation, compression of gases. (b) Evaporation, compression of gases, solubility. (c) Evaporation, diffusion, expansion of gases. (d) Evaporation, solubility, diffusion, compression of gases.

(c) Compression of gas does not increase with temperature. Similar solubility does not always increases with temperatures. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Which condition out of the following will increase the evaporation of water? (a) Increase in temperature of water (b) Decrease in temperature of water (c) Less exposed surface area of water (d) Adding common salt to water

(a) Only increase in temperature will help in the evaporation process. Adding sodium chloride will lower the vapour pressure and hence will lower evaporation. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions. (a) Low temperature, low pressure (b) High temperature, low pressure (c) Low temperature, high pressure (d) High temperature, high pressure

(c) At low temperature, the energy of the gas molecules becomes low and high pressure brings the molecules closer. These factors help in liquefaction of the gas. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

Kaveri Jha

Asked: January 31, 2025In: Class 9 Science

In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container. (ii) Some hydrogen gas leaking out of the container. (iii) Increasing the volume of the container of hydrogen gas. (iv) Adding more hydrogen gas to the container without increasing the volume of the container. (a) (i) and (iii) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)

The correct answer is (c) (ii) and (iii). When some hydrogen gas leaks out (ii), fewer molecules remain, increasing intermolecular distance. When the container’s volume increases (iii), molecules spread out to occupy the larger space, increasing their distance. Class 9th ...

Poll

Kaveri Jha

Asked: January 30, 2025In: Class 9 Science

During rainy season, rate of evaporation decreases because (a) humidity is high in air. (b) humidity is low in air. (c) humidity does not change. (d) there is no effect of humidity.

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.

Which one of the following sets of phenomenon would increase on raising the temperature? (a) Diffusion, evaporation, compression of gases. (b) Evaporation, compression of gases, solubility. (c) Evaporation, diffusion, expansion of gases. (d) Evaporation, solubility, diffusion, compression of gases.

Which condition out of the following will increase the evaporation of water? (a) Increase in temperature of water (b) Decrease in temperature of water (c) Less exposed surface area of water (d) Adding common salt to water

During rainy season, rate of evaporation decreases because (a) humidity is high in air. (b) humidity is low in air. (c) humidity does not change. (d) there is no effect of humidity.

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