Give some examples of Tyndall effect observed in your surroundings? Answer: Examples of Tyndall Effect: Sunbeam coming from ventilation. The dust p…
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An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element…
Salt can be recovered from its solution by evaporation. Suggest some other technique for the same? Answer: To separate salt from its solution crysta…
Why does the temperature of a substance remain constant during its melting point or boiling point? Answer: When heat is supplied to a solid, say ice…
Why Rate of evaporation of an aqueous solution decreases with increase in humidity. Answer: The moisture present in the atmosphere is called humidit…
Why Evaporation produces cooling. Answer: In the process of evaporation, water molecules get some of the required kinetic energy to overcome the for…
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster? …
It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why? Ans…
(a) Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid. (b) Conversion of solid sta…
Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether t…
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations. Answer: Water turns into ice when temp…
'Osmosis is a special kind of diffusion’. Comment. Answer: The movement of particles from low concentration to high concentration is responsible…
A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure And Will this water freeze at 0°C? C…
What produces more severe burns, boiling water or steam? Answer - Steam produces more severe burns than boiling water, because steam has more latent…
Why is ice at 273K more effective in cooling than water at the same temperature. Answer: At 273K ice requires more latent heat to melt into water, w…
Why An iron almirah is a solid at room temperature. Answer: An iron almirah is a solid at room temperature because: (i) It has definite shape. (ii)…
Why Water at room temperature is a liquid. Answer: At room temperature: (i) Water has definite volume, but not definite shape as it takes the shape…
Arrange the following substances in increasing order of forces of attraction between the particles – Water, Sugar, Oxygen. Answer - Oxygen < Wate…
We can get the smell of perfume sitting several meters away Why ? Answer : Perfume turns into gas at room temperature. The vapour of perfume travels…
Naphthalene balls disappear with time without leaving any solid. Why ? Answer: Naphthalene ball is a sublimate and a sublimate turns into vapour wit…