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प्रश्न
What is meant by saying that metals are lustrous ?
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उत्तर
Metals are said to be lustrous because of their property to shine.
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संबंधित प्रश्न
Fill in the blank
All matter is made up of tiny particles called ______
State two characteristics of matter demonstrated by Brownian motion.
Explain why steel is used to make railway lines.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
What is meant by saying that metals are malleable and ductile ?
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Name a metal which is yellow in colour.
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- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
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Which of the following is not an emulsion ?
What is the difference between colloids and suspensions ?
Name the process which is used in milk dairies to separate cream from milk.
What is the general name of the process by which tea-leaves are separated from prepared tea ?
How will you separate a mixture containing sand and sugar ?
One of the following does not undergo sublimation. This one is :
Atoms or groups of atoms having a charge are called ______.
Evaporation does form bubbles.
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
Give an example of a molecule.
