Centum Hour_IX

Cotton is a natural polymer made up of ---------------------

• Starch

• Cellulose

• Fructose

• Nylon

This fibre is also known as artificial silk. It is cheaper than silk and can be woven like silk fibres. What are we talking about?

• Nylon

• Rayon

• Wool

• Cotton

Which of the following is non-biodegradable?

• Paper

• Cotton

• Banana peel

• Plastic bags

Which of the following is a thermosetting plastic?

• Polyethylene

• Poly Vinyl Chloride

• Polystyrene

• Bakelite

The property of metals by which they can be beaten into thin sheets is called ---------------------

• Malleability

• Ductility

• Conductivity

• None

Among the following, the cleanest source of energy is:

• Natural Gas

• Coal

• Petroleum

• Wood

When a copper vessel is exposed to moist air for long, it acquires a ----------------------------------- coating.

• purple

• yellow

• bright red

• dull green

Which non-metal is a good conductor of electricity ?

• Phosphorus

• Sulphur

• Graphite

• Coal

The ash obtained on burning Magnesium ribbon is dissolved in water and tested for its acidic/basic nature. What change can be observed?

• Blue litmus paper turns red

• Red litmus paper turns blue

• No change in the colour of red litmus

• None

Identify the wrong statement

• Sodium reacts vigorously with water

• Zinc reacts with steam

• Calcium can react with cold water

• Copper reacts vigorously with water