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: 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: 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.

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.

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.

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 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.