Materials Quiz

According to the classification, what category does 'Oiled paper' fall under?

• Transparent

• Translucent

• Opaque

• Lustrous

Answer explanation

According to the classification, 'Oiled paper' falls under the category of Translucent, allowing some light to pass through but not completely transparent.

Which of the following materials is classified as dull?

• Gold

• Wood

• Steel

• Silver

Answer explanation

Wood is classified as dull due to its matte appearance and lack of shine compared to materials like gold, steel, and silver.

Which of the following materials is considered hard?

• Fibres

• Cotton

• Metals and alloys

• Rubber

Answer explanation

Metals and alloys are considered hard materials due to their strong atomic bonds and rigid structures, making them suitable for various industrial applications.

Which of the following materials is soluble in water?

• Chalk powder

• Saw dust

• Copper sulphate

• Sulphur

Answer explanation

Copper sulphate is soluble in water due to its chemical properties, allowing it to dissolve and form a solution.

Which of the following materials will float on water?

• Iron

• Copper

• Wood

• Glass

Answer explanation

Wood will float on water because it is less dense than water, causing it to displace water and float on the surface.

Which of the following is NOT classified as insoluble in water?

• Wax

• Nitrogen

• Potassium permanganate

• Sulphur

Answer explanation

Potassium permanganate is NOT classified as insoluble in water, unlike wax, nitrogen, and sulfur which are insoluble.

Which of the following materials is transparent?

• Oiled paper

• Tissue paper

• Glass

• Wood

Answer explanation

Glass is transparent because it allows light to pass through it, unlike oiled paper, tissue paper, and wood which are not transparent materials.

Which of the following materials is NOT soluble in water?

• Common salt

• Sugar

• Vinegar

• Chalk powder

Answer explanation

Chalk powder is NOT soluble in water, unlike common salt, sugar, and vinegar which are all soluble in water.

Which of the following materials will sink in water?

• Saw dust

• Oils

• Ice

• Copper

Answer explanation

Ice will sink in water because it is denser than water, causing it to displace water and sink to the bottom.

Which of the following materials is classified as lustrous?

• Rubber

• Wax

• Brass

• Wood

Answer explanation

Brass is classified as lustrous due to its shiny and reflective surface, unlike rubber, wax, and wood which do not exhibit the same luster.