Question : Browning of paper in old books is caused by
Option 1: frequent use
Option 2: lack of aeration
Option 3: collection of dust
Option 4: oxidation of cellulose
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Correct Answer: oxidation of cellulose
Solution : The correct option is the oxidation of cellulose.
The browning of paper in old books is primarily caused by the oxidation of cellulose, a process accelerated by exposure to light, air and moisture. Over time, atmospheric oxygen reacts with cellulose fibres, leading to chemical changes that result in the characteristic discolouration and deterioration of paper.
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Question : Copper is refined by
Option 1: Roasting
Option 2: Oxidation
Option 3: Electrolysis
Option 4: Zone refining
Question : Rabies is caused by
Option 1: bacteria
Option 2: virus
Option 3: fungus
Option 4: algae
Question : Chicken pox is caused by
Option 1: Protozoa
Option 2: Bacteria
Option 3: Virus
Option 4: Fungus
Question : 'Plague' is caused by ___.
Option 1: Bacteria
Option 2: Protozoa
Option 4: All of the above
Question : Smut of wheat is caused by:
Option 1: Ustilago maydis
Option 2: Puccinia graminis
Option 3: Ustilago tritici
Option 4: Colletotrichum falcatum
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