Fill in the blank: Objects can be categorized based on different criteria, such as the material they are made of, including ___, ___, and ___ materials.

Glass, metal, plastics

True or False: All objects around us are made of a single material.

False. All objects are made of one or more materials.

Multiple Choice: Which of the following is NOT typically considered a daily object? A) Chair B) Bullock cart C) Galaxy D) Toy

C) Galaxy

What are the primary characteristics that influence the selection of materials for creating objects?

The primary characteristics include appearance, hardness, and solubility in water.

Fill in the blank: Materials that can be easily compressed or scratched are considered ____, while those that are difficult to compress are considered ____.

Soft; hard

True or False: All metals have a shiny or lustrous appearance that remains unchanged over time.

False. Some metals can lose their shine and appear dull due to exposure to air and moisture.

Riddle: I can dissolve completely in water, but you will never see me again. What am I?

A soluble substance.

Which materials are generally classified as hard and which as soft? Provide examples for each.

Hard materials include iron and stone, while soft materials include cotton and sponge.

What is the significance of water being called a universal solvent?

Water is called a universal solvent because it can dissolve many substances, making it essential for various biological and chemical processes.

Fill in the blank: Oxygen gas is ____ in water, which is vital for aquatic animals and plants.

Soluble

Which type of materials typically cannot blend with water, even after extensive stirring?

Insoluble materials.

MCQ: Which of the following is NOT an example of a hard material? a) Iron b) Cotton c) Stone d) Aluminum

B) Cotton

What are the three categories of materials based on their ability to transmit light?

The three categories are transparent, translucent, and opaque.

Fill in the blank: Materials that allow light to pass through completely are called ___.

Transparent

True or False: Opaque materials allow light to pass through partially.

False. Opaque materials do not allow light to pass through at all.

Riddle: I can be seen through but cannot be touched, I help you see what's inside without a fuss. What am I?

A transparent container.

Fill in the blank: Materials such as wood and cardboard are classified as ___ because they do not allow light to pass through.

Opaque

Short answer: Why do lighter materials like paper and wood float on water?

Lighter materials float on water because they have a lower density than water.

Fill in the blank: Materials lose their shine and appear dull due to the action of ___ and ___ on them.

Air and moisture