Diffusion
Trending Questions
Q.
The fragrance of a burning incense stick spreads all around due to _______________.
Q. When an incense stick is lit in one corner of a room, its odour can be smelt from all the corners. This is because of the phenomenon called:
- Evaporation
- Sublimation
- Vapourization
- Gaseous diffusion
Q. Diffusion is the movement of particles from the area of high concentration to low concentration.
- True
- False
Q. The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close. Explain the reason. [2 Marks]
Q. Choose the correct pairs with respect to type of diffusion.
- Liquid in liquid
- Solid in liquid
- Gas in gas
Q.
Give a reason for the following statement:-
If a drop of dye is added to a glass of water, it gets evenly distributed throughout the liquid.
Q. Assertion :Deep sea divers carry oxygen cylinders with them. Reason: The deficiency of oxygen in bottom waters changes the type of organisms also. They are mostly small and fast-growing and can tolerate low concentrations of oxygen. At the bottom only bacteria and fungi can survive.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
- Assertion is correct but Reason is incorrect.
- Both Assertion and Reason are incorrect.
Q. Which apparatus can be used to introduce more liquid into a reaction and also serve as a pressure valve?
- Thistle tube
- Pinchcock
- Flask
- Condenser
- Stopcock
Q. A perfume sprayed at one end of the room is spread throughout the room by the process of __________.
- sublimation
- diffusion
- evaporation
- condensation
Q. Liquid sanitizers quickly
- evaporate
- melt
- hot
- cold
Q. Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.
Q.
Give reason for the following observation:
The smell of lighted incense stick spreads several meters away.
