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
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Name the property which allows metals to be hammered into thin sheets.
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
The element which is not common between the compounds called baking soda and soda ash is
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Choose the correct answer.
A 5 per cent sugar solution means that :
State whether the following statement is true or false :
Bread is an example of solid foam.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Name one pair of liquids which can be separated by using a separating funnel.
Why wires cannot be drawn from materials such as stone or wood?
A standard sheet of paper is about ______ of atoms thick
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Which statement is not correct for a mixture
Give an example of liquid in gas.
Write a scientific reason.
Lemon sherbat has a sweet, sour and salty taste and it can be poured in a glass.
