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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
Name the terms for the particles of matter which may or may not have independent existence.
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
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 ...................
What are pure substances ? Give two examples of pure substances.
How would you confirm that a colourless liquid given to your is pure water ?
Which of the following does not have a fixed melting point/boiling point ?
How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
Define Sol and give one example.
9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.
Define solubility of a substance. How does it vary with temperature ?
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Pure copper sulphate can be obtained from an impure sample by the process of :
Which of the following cannot be separated from air by the process of fractional distillation ?
The best way to recover sugar from an aqueous sugar solution is :
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Rusting of an article made up of iron is called
Solids do not flow.
