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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/

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.

Poll

Kaveri Jha

Asked: January 30, 2025In: Class 9 Science

Solids, liquids and gases differ from each other in terms of (a) arrangement of particles. (b) attractive forces between the particles. (c) spaces between the particles. (d) all of these.

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 ...

Kaveri Jha

Asked: January 30, 2025In: Class 9 Science

Choose the correct statement out of the following: ( a) Conversion of solid into vapours without passing through the liquid state is called sublimation. (b) Conversion of vapours into solid without passing through the liquid state is called sublimation. (c) Conversion of vapours into solid without passing through the liquid state is called freezing. (d) Conversion of solid into liquid is called sublimation.

The correct answer is (a) Conversion of solid into vapours without passing through the liquid state is called sublimation. Sublimation occurs when substances like camphor or dry ice change directly from a solid to a gas without becoming liquid. Class ...

Poll

Kaveri Jha

Asked: January 30, 2025In: Class 9 Science

On converting 25 °C, 38 °C and 66 °C to Kelvin scale, the correct sequence of temperature will be (a) 298 K, 311 K and 339 K (b) 298 K, 300 K and 338 K (c) 273 K, 278 K and 543 K (d) 298 K, 310 K and 338 K

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 ...

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

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.

Solids, liquids and gases differ from each other in terms of (a) arrangement of particles. (b) attractive forces between the particles. (c) spaces between the particles. (d) all of these.

On converting 25 °C, 38 °C and 66 °C to Kelvin scale, the correct sequence of temperature will be (a) 298 K, 311 K and 339 K (b) 298 K, 300 K and 338 K (c) 273 K, 278 K and 543 K (d) 298 K, 310 K and 338 K

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