Advertisements
Advertisements
प्रश्न
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
Advertisements
उत्तर
Robert Brown studied the movement of pollen grains suspended in water through a microscope. He observed that the pollen grains moved in a zigzag motion. This phenomenon is called Brownian motion and it provides an evidence for existence and movement of particles.
APPEARS IN
संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
What are molecules ?
What are the conditions for 'something' to be called 'matter'?
Name a metal which forms amalgams.
“Is malleable and ductile” best describes :
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
How will you separate a mixture of common salt, sulphur powder and sand ?
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
How will you separate a mixture of iron filings, chalk powder and common salt ?
Explain how, nitrogen , oxygen and argon gases are separated from air.
Naphthalene can be separated from sand :
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Give some examples of the Tyndall effect observed in your surroundings?
Higher the temperature, the higher the kinetic energy of particles.
Gas-solid is ______.
Define the term matter.
