Q6 of 22 Page 33

Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?

Mixing other metals in iron resulting in its composition make it resistant of rusting. Therefore, Iron pillars of Qutub Minar has not rusted from such a long period.

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4

Which of the following is/are true when milk changes into curd?

(i) Its state is changed from liquid to semi solid.


(ii) It changes colour.


(iii) It changes taste.


(iv) The change cannot be reversed.


Choose the correct option from below :

 5

A man painted his main gate made up of iron, to

(i) prevent it from rusting.


(ii) protect it from sun.


(iii) make it look beautiful.


(iv) make it dust free.


Which of the above statement(s) is/are correct?

 7

Galvanisation is a process used to prevent the rusting of which of the following?

 8

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a-