Chemistry

What is exhaustible recourses

• limited resourses

• unlimited resources

• burning resources

• none of these

Which Synthetic Fibre is known as artificial silk

• nylon

• polyster

• rayon

• none of these

Which plastic can be melted by heating?(please write all letters non-caps)

(a)  

What is the MOST hottest part of the flame?

• Top-most (non-luminous)

• mid-layer

• bottom-most

• blue zone

What is added to sodium bicarbonate solution to produce the foam of carbon dioxide

• Pottasium

• saponin

• chlorine

• Sulphur

The materials that are burnt to produce a large amount of heat energy are called?

• nucleus

• petrol

• coal

• fuel

What is produced from middle layer of flame?

(a)  

Which of these are formed from petroleum

• petrol

• coke

• fuel oil

• coaltar

The lowest temperature to which a substance must be heated to catch fire and start burning is called?

(a)  

Which of these is known as "Clean Fuel"?

• LPG

• coaltar

• Natural gas

• lubrication oil