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प्रश्न
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 ...................
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उत्तर
The best evidence of the particles of matter are constantly moving comes from the studies of diffusion and Brownian motion.
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संबंधित प्रश्न
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
Liquids have definite shape and definite volume.
Name a metal which is soft and a non-metal which is hard.
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Give reason why copper metal is used for making electric wires.
Name a metal which has no fixed shape.
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Choose the correct answer.
A 15% alcohol solution means :
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
What is the effect of temperature on the solubility of solids in liquids ?
What is a suspension ? Give two examples of suspensions.
One of the following liquids will leave behind a residue on heating. This one is :
Name the source from which nitrogen and oxygen are obtained on a large scale.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
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?
Define the term matter.
