Materials and Their Applications

This is the correct option as ceramics are not a naturally occurring material.

Steel is a metal and all metals are sonorous. So, this is correct.

The same is the correct option as composite materials are the ones which are made by combining two or more materials.

Aluminium is a light metal and has properties like meltability and ductility. Hence, it is correct.

It is buoyant as it has air spaces, which keep it afloat in water. This results in less density than water.

Steel is a heat conductor. Hence, it is correct.

Option 3 is the odd one out as pulp and wood are raw materials for preparing the final products, i.e. paper and furniture, respectively. Iron does not lead to the production of wood. They are not related.

This is the correct option. A glass rod can be charged by friction by rubbing it with a silk cloth.

This is a the right answer. Canvas is used to make tents, grass, leaves and bamboo are used to make huts.

Melamine resists fire and can tolerate heat better than other plastics. Thus, it is used for making floor tiles and kitchenware.

Germanium is a chemical element with symbol Ge and atomic number 32. It is a lustrous, hard, grayish-white metalloid in the carbon group, which is chemically similar to its group neighbours, tin and silicon.

Wood is degraded by other living organisms. Thus, wood is a biodegradable material.

Wood does not produce a ringing sound when struck with another material. So, it is not a sonorous material. Sonorous material produces a ringing sound when struck with another material.

Gamma rays have the maximum penetrating power and therefore, they are used to control the thickness of paper, plastic and metallic sheets during their manufacture.

Bleaching powder is used for the manufacture of chloroform. Chloroform is prepared in the laboratory and on large scale by distilling ethyl alcohol or acetone with bleaching powder and water. So the given option is correct.