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प्रश्न
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
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उत्तर
The elements that are sonorous are called metals.
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संबंधित प्रश्न
The molecules can move freely anywhere in
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Define the term matter. What is it composed of?
What are molecules ?
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
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 sonorous ?
Give reason why copper metal is used for making electric wires.
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
What is the most common way of expressing the concentration of a solution ?
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Define solute.
Define solubility of a substance. How does it vary with temperature ?
What is the effect of temperature on the solubility of solids in liquids ?
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
The material which is added to water during purification process at the water works so as to disinfect it is :
Explain the meaning of the term ‘matter’.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
