Chapter Exam

Chapter-6 Materials Around Us — Online MCQ Test

Q: What do we call the shiny quality of a material that reflects light?

Answer: A. Lustre — Lustre is the property of a material that describes how shiny or reflective it is when light falls on it.

Q: Which material shows the highest lustre?

Answer: B. Metal — Metals like gold, silver, and copper have high lustre and shine brightly because they reflect light well.

Q: Which material is transparent?

Answer: C. Glass — Glass is transparent, meaning light passes through it completely and we can see objects clearly through it.

Q: Why does a mirror have high lustre?

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.

Q: Which of the following materials would dissolve in water?

Answer: C. Salt — Salt is soluble in water and dissolves completely, while sand, stone, and iron are insoluble materials.

Q: Comparing three materials - gold, paper, and glass - which material would have lustre, be insoluble in water, and be opaque?

Answer: A. Gold — Gold has high lustre (shiny), is insoluble in water, and is opaque. Paper has low lustre, and glass is transparent.

Q: A teacher shows four materials: A (shiny metal), B (clear plastic), C (cloudy plastic), D (wood). Identify which is opaque with no lustre.

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.

Q: A competitive question: Diamond is transparent, colourless, and has extremely high lustre. Which property would NOT be suitable to identify diamond among gemstones?

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.

SCIENCE · Grade 6 · CBSE(NCERT)

Practice Chapter-6 Materials Around Us with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 6 SCIENCE. This chapter covers: lustre - solubility - transparency - material properties. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-6 Materials Around Us — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 6 SCIENCE — Chapter-6 Materials Around Us, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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