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प्रश्न
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
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उत्तर
The zigzag movement of the small particles suspended in a liquid or a gas is called Brownian motion.
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संबंधित प्रश्न
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
What is the other name for impure substances ? Give two examples of impure substances.
Name two solid, two liquid and two gaseous elements at the room temperature.
Give reason why graphite is used for making elecrode in a dry cell.
How would you confirm that a colourless liquid given to your is pure water ?
Which one of the following is not a metalloid ?
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
How will you separate a mixture of common salt, sulphur powder and sand ?
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Which statement is not correct for a mixture
The phenomenon of Evaporation takes place at the ______ of a liquid.
Write a scientific reason.
Lemon sherbat has a sweet, sour and salty taste and it can be poured in a glass.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
Define the term matter.
