(a) The humidity is high in air, therefore the rate of evaporation decreases. There is limit to moisture that the air can carry at a particular temperature. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(a) The humidity is high in air, therefore the rate of evaporation decreases. There is limit to moisture that the air can carry at a particular temperature.
(c) Solid CO2 is called dry ice because it does not wet on evaporation and directly changes into vapours. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(c) Solid CO2 is called dry ice because it does not wet on evaporation and directly changes into vapours.
(a) Conversion of solid into vapours without passing through the liquid state is called sublimation. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(a) Conversion of solid into vapours without passing through the liquid state is called sublimation.
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.
(a) The humidity is high in air, therefore the rate of evaporation decreases. There is limit to moisture that the air can carry at a particular temperature. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(a) The humidity is high in air, therefore the rate of evaporation decreases. There is limit to moisture that the air can carry at a particular temperature.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessSolids, 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.
(d) All the options are correct. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(d) All the options are correct.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessChemically, dry ice is (a) solid SO₂ (b) solid NO₂ (c) solid CO₂ (d) solid H₂
(c) Solid CO2 is called dry ice because it does not wet on evaporation and directly changes into vapours. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(c) Solid CO2 is called dry ice because it does not wet on evaporation and directly changes into vapours.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessChoose 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.
(a) Conversion of solid into vapours without passing through the liquid state is called sublimation. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(a) Conversion of solid into vapours without passing through the liquid state is called sublimation.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessOn 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
(a) 25 °C = 273 + 25 = 298 K, 38 °C = 273 + 38 = 311 K, 66 °C = 273 + 66 = 339 Κ. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
(a) 25 °C = 273 + 25 = 298 K, 38 °C = 273 + 38 = 311 K, 66 °C = 273 + 66 = 339 Κ.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See less