Advertisements
Advertisements
प्रश्न
Wipe the board with a duster and then tap the duster against the table. What do you see?
Advertisements
उत्तर
When we wipe the blackboard with a duster, we see particles of chalk powder settling on the duster. When the duster is tapped against any hard surface, these particles move out of the duster and settle elsewhere. The chalk powder spreads everywhere.
APPEARS IN
संबंधित प्रश्न
Fill in the blank :
The substances which can flow are called ________
A kind of matter which can sublime is
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Name a non-metal which is a good conductor of electricity.
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
What is meant by the concentration of a solution ?
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 ?
Matter is made up of ______.
The particles in the matter are extremely small and can be seen even with a powerful microscope.
The phenomenon of Evaporation takes place at the ______ of a liquid.
