1. Why is potassium permanganate used for purifying drinking water?
[A]Because it is an oxidising agent
[B]Because it is a reducing agent
[C]Because it is a sterilising agent
[D]Because it dissolves the impurities of water
2. Polythene is industrially prepared by the polymerization of ______________.
[A]Styrene
[B]Methane
[C]Ethylene
[D]Acetylene
3. Thalassaemia is a hereditary disease affecting ___________.
[A]Lungs
[B]Blood
[C]Kidney
[D]Heart
4. Which of the following is an element?
[A]Emerald
[B]Diamond
[C]Sapphire
[D]Ruby
5. Transistors used in electric equipments are mostly made of ______________.
[A]Silver
[B]Carbon
[C]Copper
[D]Silicon
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