Advertisements
Advertisements
Question
How is scrap iron separated from a heap of waste materials in factories?
Advertisements
Solution
Scrap iron is separated from a heap of waste materials in factories by using large electromagnets fitted to a crane. The electromagnet fitted crane is moved up and away from the waste to drop these scrap iron objects at a separate place. Electromagnets are used for this purpose because one can switch on and off the supply of magnetism during the process of lifting and dropping of the iron pieces.
APPEARS IN
RELATED QUESTIONS
The inter-molecular force is maximum in
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
Fill in the blank
Liquids have a definite ______
What is the scientific name of particles which make up mater?
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
Define matter. Give four examples of matter.
What are the characteristics of matter?
Name the property which allows metals to be hammered into thin sheets.
What is meant by saying that metals are lustrous ?
Which one of the following is not a metalloid ?
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
Choose the correct answer.
A 15% alcohol solution means :
One of the following represents the solution of solid in a solid. This one is :
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
The dyes present in fountain pen ink can be separated by the technique of :
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
 |
 |
 |
The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Gas-solid is ______.
Give an example of liquid in gas.
