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प्रश्न
Define Foam Give one example.
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उत्तर
Foam- A foam is a colloid in which a gas is dispersed in a liquid medium. Examples are soap bubbles and shaving cream.
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संबंधित प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
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Name the property which allows metals to be hammered into thin sheets.
Name the property which enables metals to be drawn into wires.
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- H2O
- He
- Cl2
- CO
- Co
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Which of the following is not an element ?
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
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- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
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What is the effect of temperature on the solubility of solids in liquids ?
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Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
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Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
A standard sheet of paper is about ______ of atoms thick
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
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