Advertisements
Advertisements
प्रश्न
What are the conditions for 'something' to be called 'matter'?
Advertisements
उत्तर
The main conditions for something to be matter are, it should:
- occupy space and
- have mass
APPEARS IN
संबंधित प्रश्न
The best evidence for the existence and movement of particles in liquids was provided by :
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 the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
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 ?
Choose the correct answer.
A 15% alcohol solution means :
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
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 would you separate iodine from a mixture of iodine and common salt ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
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?
Atoms or groups of atoms having a charge are called ______.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Liquids have ______.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
The phenomenon of Evaporation takes place at the ______ of a liquid.
