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Subject :NSO    Class : Class 7

Raj has put two different objects in each of the following containers.
Container (i) : copper coin and iron nail
Container (ii) : steel nail and aluminium earring
Container (iii) : marble and gold coin
Container (iv) : nickel coin and steel nail
He can use a magnet to separate the objects in containers __________ .

A(i) and (ii)
B(i), (ii) and (iii)
C(i), (ii) and (iv)
D(i), (ii), (iii) and (iv).

Ans 1:

Class : Class 7
It should be 1 and four, the option of which is not given.

Ans 2:

Class : Class 7
Magnetic separation can only be used in the cases in which one constituent is magnetic and the other is not. In case one Copper is not magnetic and iron is. In the second case Aluminium is not magnetic and Steel is. nIn the third case both the objects gold and the glass marble are non magnetic objects and hence magnetic separation cannot be used in this case. In the last case both Nickel as well as Steel are magnetic and thus magnetic separation cannot be used. So, magnetic separation can only be used in case 1 and case. Hence the answer is A

Ans 3:

Class : Class 8
The correct option is answer c Containers 1,2,4

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