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प्रश्न
Give reason why copper metal is used for making electric wires.
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उत्तर
Copper is a good conductor of electricity. It is ductile and less expensive; therefore, it is used for making electrical wires.
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संबंधित प्रश्न
Solids have definite shape and definite volume.
Liquids have definite volume but do not have definite shape.
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
What are the conditions for 'something' to be called 'matter'?
What are the characteristics of matter?
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
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What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
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- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
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Name the process by which common salt is obtained from sea-water.
How will you separate a mixture containing sand and sugar ?
How will you separate a mixture of iron filings and powdered carbon ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
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 |
Compressibility of solids: ______.
Define the term matter.
