Question

Select those objects from the following which shine: Glass bowl, plastic toy, steel spoon, cotton shirt.

Answer 1

Hint: Based on the appearance, the material can be classified into two groups such as lustrous and non-lustrous. Lustrous materials appear shiny while non-lustrous materials do not shine.

Complete answer:
In our everyday life, we use different things. All these things are made up of a different type of material. All these materials are classified into different groups based on their characteristic property. One of the criteria used to classify the material is their appearance. The various properties of the material used to classify them based on their appearance such as texture, hardness, colour and lustre.
Here, we have given the materials like a glass bowl, plastic toy, steel spoon, cotton shirt.
We can classify these materials using their lustrous and non-lustrous property. We can visually identify whether the material is lustrous or non-lustrous by their shiny appearance. Lustrous materials appear shiny while non-lustrous materials do not shine.
Out of the given, four materials glass bowls and steel spoons are lustrous and appear shiny. While plastic toys and cotton shirts are non-lustrous that is they do not shine.
Thus, the objects which shine are glass bowls and steel spoons.

Note: The various properties of the material used to classify them are state, appearance, solubility, metallic and non-metallic property, light transmission property. Appearance is a visual property where material can be again classified based on their texture, hardness, colour and lustrous behaviour. Objects which have lustrous or shiny appearance are classified as lustrous materials and non-shiny materials are classified as non -lustrous materials.