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प्रश्न
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
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उत्तर
Electromagnets are fitted in cranes to separate scrap iron objects from a heap of waste material in factories.
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संबंधित प्रश्न
Liquids have definite shape and definite volume.
Name the terms for the change of vapour into a liquid.
A kind of matter which can sublime is
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 ...................
Honey is more viscous than water. Can you suggest why?
Define matter. Give four examples of matter.
What are the characteristics of matter?
When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :
Name a non-metal which is a good conductor of electricity.
Give reason why graphite is used for making elecrode in a dry cell.
Name a metal which is yellow in colour.
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
What will happen if a saturated solution is :
- heated
- cooled
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
How will you separate a mixture containing sand and sugar ?
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
What type of matter glass is?
Define the term matter.
