Chapter-6 Materials Around Us — Online MCQ Test
SCIENCE (CURIOSITY) · CLASS 6th · Karnataka State Board
Practice Chapter-6 Materials Around Us with a free chapter-wise online MCQ test.
This chapter covers: lustre - solubility - transparency - material properties.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-6 Materials Around Us — Important Questions & Answers
What do we call the shiny quality of a material that reflects light?
- A. Lustre
- B. Transparency
- C. Solubility
- D. Hardness
Answer: A. Lustre
Lustre is the property of a material that describes how shiny or reflective it is when light falls on it.
Lustre is the property of a material that describes how shiny or reflective it is when light falls on it.
Which material shows the highest lustre?
- A. Wood
- B. Metal
- C. Rubber
- D. Plastic
Answer: B. Metal
Metals like gold, silver, and copper have high lustre and shine brightly because they reflect light well.
Metals like gold, silver, and copper have high lustre and shine brightly because they reflect light well.
What is solubility?
- A. The ability of a material to dissolve in a liquid
- B. The ability of a material to reflect light
- C. The ability of a material to conduct heat
- D. The ability of a material to stretch
Answer: A. The ability of a material to dissolve in a liquid
Solubility refers to the property of a substance to dissolve in another substance, usually a liquid like water.
Solubility refers to the property of a substance to dissolve in another substance, usually a liquid like water.
Which material is transparent?
- A. Brick
- B. Metal
- C. Glass
- D. Wood
Answer: C. Glass
Glass is transparent, meaning light passes through it completely and we can see objects clearly through it.
Glass is transparent, meaning light passes through it completely and we can see objects clearly through it.
Why does a mirror have high lustre?
- A. Because it is made of plastic
- B. Because its surface reflects light very well
- C. Because it is transparent
- D. Because it is soft
Answer: B. Because its surface reflects light very well
Mirrors have high lustre because their polished metallic surface reflects light efficiently, creating a shiny appearance.
Mirrors have high lustre because their polished metallic surface reflects light efficiently, creating a shiny appearance.
Which of the following materials would dissolve in water?
- A. Sand
- B. Stone
- C. Salt
- D. Iron
Answer: C. Salt
Salt is soluble in water and dissolves completely, while sand, stone, and iron are insoluble materials.
Salt is soluble in water and dissolves completely, while sand, stone, and iron are insoluble materials.
Comparing three materials - gold, paper, and glass - which material would have lustre, be insoluble in water, and be opaque?
- A. Gold
- B. Paper
- C. Glass
- D. All three
Answer: A. Gold
Gold has high lustre (shiny), is insoluble in water, and is opaque. Paper has low lustre, and glass is transparent.
Gold has high lustre (shiny), is insoluble in water, and is opaque. Paper has low lustre, and glass is transparent.
A teacher shows four materials: A (shiny metal), B (clear plastic), C (cloudy plastic), D (wood). Identify which is opaque with no lustre.
- A. A
- B. B
- C. C
- D. D
Answer: D. D
Wood is opaque (blocks light) and has low lustre (not shiny). A is lustrous, B and C are at least partially transparent.
Wood is opaque (blocks light) and has low lustre (not shiny). A is lustrous, B and C are at least partially transparent.
A competitor exam question: Which statement is INCORRECT about material properties?
- A. Lustre is an intensive property that does not change with quantity
- B. Solubility can change with temperature but transparency cannot
- C. A material can be both transparent and lustrous simultaneously
- D. Opacity is the complete absence of transparency
Answer: B. Solubility can change with temperature but transparency cannot
Both solubility and transparency can change with temperature. Ice is opaque but becomes transparent water when temperature increases.
Both solubility and transparency can change with temperature. Ice is opaque but becomes transparent water when temperature increases.
A competitive question: Diamond is transparent, colourless, and has extremely high lustre. Which property would NOT be suitable to identify diamond among gemstones?
- A. Its high lustre combined with hardness
- B. Transparency alone
- C. Its insolubility in water
- D. Its crystal structure
Answer: B. Transparency alone
Many gemstones are transparent and colourless. Transparency alone cannot uniquely identify diamond; hardness or lustre combined with other properties would be needed.
Many gemstones are transparent and colourless. Transparency alone cannot uniquely identify diamond; hardness or lustre combined with other properties would be needed.