Class 9 Science

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Category: Class 9 Science

NCERT Solutions for Class 9 Science for CBSE exams 2020-2021.

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

A few substances are arranged in the increasing order of forces of attraction between their particles. Which one of the following represents a correct arrangement ? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air

(c) Solids have the maximum force of attraction between particles followed by liquids followed by gases. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

Forces of attraction are (a) maximum in solids and minimum in gases. (b) maximum in gases and minimum in solids. (c) maximum in liquids and minimum in gases. (d) maximum in gases and minimum in liquids.

(a) Particles are closest in solids and maximum apart in gases. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

Poll

Kanta Jha

Asked: January 31, 2025In: Class 9 Science

The boiling points of diethyl ether, acetone and n-butyl alcohol are 35 °C, 56 °C and 118 °C respectively. Which one of the following correctly represents their boiling points in kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 Κ, 391 Κ (d) 329 K, 392 Κ, 308 K

(c) We can check by adding 273 to the celcius temperature. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-1/

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/

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Category: Class 9 Science

A few substances are arranged in the increasing order of forces of attraction between their particles. Which one of the following represents a correct arrangement ? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air

Forces of attraction are (a) maximum in solids and minimum in gases. (b) maximum in gases and minimum in solids. (c) maximum in liquids and minimum in gases. (d) maximum in gases and minimum in liquids.

The boiling points of diethyl ether, acetone and n-butyl alcohol are 35 °C, 56 °C and 118 °C respectively. Which one of the following correctly represents their boiling points in kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 Κ, 391 Κ (d) 329 K, 392 Κ, 308 K

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

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