Question : The material used in the manufacture of lead pencil is
Option 1: Graphite
Option 2: Lead
Option 3: Carbon
Option 4: MIca
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Correct Answer: Graphite
Solution : The correct option is - Graphite
The material used in the manufacture of a lead pencil is a mixture of graphite and clay.The core of a pencil is made by grinding a mixture of graphite and clay into a fine powder. The proportions of graphite to clay can vary, affecting the hardness or softness of the pencil.This mixture is then mixed with water and various additives, and then extruded through a machine to form long, thin rods. These rods are then dried and cut into the familiar pencil length.
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Question : Percentage of lead in lead pencil is
Option 1: 0
Option 2: 31-66
Option 3: 40
Option 4: 80
Question : The purest form of carbon among the options is
Option 1: Anthracite
Option 2: Lamp black
Option 3: Graphite
Option 4: Wood charcoal
Question : Glycol is used to manufacture which of the following?
Option 1: Nylon
Option 2: Artificial silk
Option 3: Terylene
Option 4: Rubber
Question : Electric fuse is an alloy of
Option 1: Tin and lead
Option 2: Zinc and lead
Option 3: Copper and iron
Option 4: Carbon and tin
Question : In nuclear reactors, graphite is used as a / an
Option 1: Fuel
Option 2: Lubricant
Option 3: Moderator
Option 4: Insulator
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