All questions of Materials Around Us for Class 6 Exam

Understanding Translucent Materials
Translucent materials play a unique role in how we perceive light and visibility. Here’s a detailed explanation of what "translucent" means in the context of materials:
Definition of Translucent
- Translucent materials allow light to pass through but do not permit clear visibility of objects behind them. This means that while some light is transmitted, it is diffused or scattered, making objects appear blurred or indistinct.
Examples of Translucent Materials
- Common examples include:
- Frosted glass
- Wax paper
- Some types of plastic
- Certain fabrics
Comparison with Other Material Types
- To clarify further, let's compare translucent materials with other types:
- Transparent: Materials that allow light to pass through clearly, such as clear glass. You can see objects clearly through them.
- Opaque: Materials that do not allow any light to pass through, such as wood and metal. No light can penetrate, making them completely block visibility.
Importance of Translucent Materials
- Translucent materials are useful in various applications where privacy is needed while still allowing light to enter, such as:
- Shower doors
- Decorative windows
- Lampshades
In summary, translucent materials are essential for balancing light transmission and privacy, allowing some light to filter through while obscuring clear visibility.

Paper is derived from trees, which are a natural resource, while plastic, glass, and metal are man-made materials.

Material Used for Making Windows: Glass
Glass is commonly used for making windows because of its transparency and durability. Let's explore why glass is the preferred material for windows:

Transparency:
- Glass is transparent, allowing natural light to enter a space and providing a clear view of the outside.
- This transparency creates a sense of openness and connection to the surroundings.

Durability:
- Glass is a durable material that can withstand various weather conditions, including rain, wind, and sunlight.
- It is also resistant to scratches and does not deteriorate easily over time.

Insulation:
- Glass windows can be designed to provide thermal insulation, helping to maintain a comfortable indoor temperature.
- Double or triple-pane glass windows with gas fills can enhance energy efficiency by reducing heat loss.

Aesthetics:
- Glass windows come in various styles, sizes, and designs, allowing for customization to complement the architectural style of a building.
- They can enhance the visual appeal of a space and create a modern and sleek look.

Ease of Maintenance:
- Glass windows are relatively easy to clean and maintain compared to other materials like wood or metal.
- Regular cleaning with a glass cleaner can keep windows looking clear and sparkling.
In conclusion, the transparency, durability, insulation properties, aesthetics, and ease of maintenance make glass the ideal material for making windows in buildings. Its versatility and functionality have made it a popular choice among architects, builders, and homeowners.

Sugar dissolves in water, forming a solution, while sand, chalk, and clay do not dissolve in water.

Gas fills the space of its container and has mass, unlike solids and liquids which have a definite shape or volume.

Mass is the measure of the amount of matter in an object, typically measured in grams or kilograms.

Understanding Transparency
Transparency is a key property that indicates how clearly we can see through a material. It plays a crucial role in various applications, from everyday objects to scientific instruments.
What is Transparency?
- Transparency refers to the ability of a material to allow light to pass through it without significant scattering.
- Materials can be categorized based on their transparency:
- Transparent: Clear materials like glass and clear plastics that allow light to pass through unobstructed.
- Translucent: Materials like frosted glass or certain plastics that allow some light to pass but scatter it, making objects behind them unclear.
- Opaque: Materials like wood or metals that do not allow light to pass through at all.
Importance of Transparency
- Vision and Safety: Transparent materials are crucial for windows in buildings and vehicles, providing visibility while ensuring safety.
- Science and Technology: In laboratories, transparent containers and equipment allow scientists to observe reactions and processes clearly.
- Art and Design: Artists often use transparent materials to create visually appealing effects in their work.
Conclusion
Understanding transparency helps us choose the right materials for specific purposes. It is essential for enhancing visibility and functionality in various fields, making it a fundamental property to consider.

Understanding Opaque Materials
Opaque materials are substances that do not allow light to pass through them. This characteristic is essential in various applications, from construction to art. Let’s delve into why wood is considered an opaque material.
Characteristics of Opaque Materials
- Light Blockage: Opaque materials prevent the transmission of light. When light hits these substances, it is either absorbed or reflected, making it impossible to see through them.
- Examples: Common examples include metals, ceramics, and dense materials like wood.
Analysis of the Options
- Clear Plastic: This is a transparent material, allowing light to pass through easily.
- Frosted Glass: While frosted glass scatters light and is not clear, it still allows some light to penetrate, making it semi-opaque rather than fully opaque.
- Wood: This material is solid and does not permit any light to pass through. Thus, it is a classic example of an opaque material.
- Transparent Glass: As the name implies, this material is clear and allows light to pass through unobstructed.
Conclusion
In summary, option 'C' (Wood) is the correct answer because it fully blocks light, making it an opaque material. Understanding the classification of materials based on their interaction with light is crucial for recognizing their uses in everyday life.