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प्रश्न
A rubber ball changes its shape on pressing. Can it be called a solid?
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उत्तर
Yes. A solid has a certain shape and size. The shape of a rubber ball changes only if we squeeze it.
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संबंधित प्रश्न
Name the smallest particle from which matter is made up.
Give reasons
The odour of scent spreads in a room.
Give reasons
Liquids have definite volume but no definite shape
Describe simple experiments to prove that solids have a definite volume
Describe simple experiments to prove that liquids have no definite shape
Describe simple experiments to prove that gases have no definite volume or shape.
Which of the following are the states of matter?
Match the following.
| Srl. no. | A | B | C |
| i | Separation of visible undesirable components | Water mixed with chalk powder | Magnetic Separation |
| ii | Separation of heavier and lighter components | Sand and water | Decantation |
| iii | Separation of insoluble impurities | Iron impurities | Filtration |
| iv | Separation of magnetic components from non-magnetic components | Rice and stone | Hand-picking |
| v | Separation of solids from liquids | Husk and paddy | Winnowing |
Choose the odd one:
A strong current of trivalent gaseous boron passed through a silicon crystal decreases the density of the crystal due to part replacement of silicon by boron and due to interstitial vacancies created by missing Si atoms. In one such experiment, one gram of silicon is taken and the boron atoms are found to be 1000 ppm by weight, when the density of the Si crystal decreases by 12%. The percentage of missing vacancies due to silicon, which are filled up by boron atoms will be ____ g. [Given · Atomic wt. Si= 30, B = 11]
