Test: Sorting Materials into Groups - UPSC MCQ

To identify the odd item from the list, consider the function or category of each item:

1. Spade: A tool used for digging.
2. Eraser: An object used for removing pencil marks.
3. Tawa: A flat cooking pan used in Indian cooking.
4. Pressure cooker: A cooking appliance used for cooking food under pressure.

Eraser is the odd one out because it is the only item that is not related to cooking or tools used in cooking or gardening. The other items are related to either cooking (Tawa, Pressure cooker) or tools used for specific tasks (Spade).

Correct Answer:

2. Eraser

Explanation for the correct option:

As muslin cloth partially allows light to pass through it, hence this is a translucent material. So Muslin cloth.

Hence, option (C) is correct.

Explanation for incorrect options

Option A: The Glass tumbler is a clear object that gives a clear picture of objects on another side, hence is a transparent object.

Option B: The mirror reflects all rays falling on it, we can see our own image but we can't see objects that are behind the mirror, hence mirror is an opaque object.

Option D: Aluminium foil does not allow light rays to pass through, hence this is an opaque object.

Hence, options (A), (B), and (D) are incorrect.

Metals when cut, their freshly cut surface has shining.

The property of metals by which they can be beaten into thin sheets is called malleability. Most metals are malleable. Gold and silver are the best malleable metals and can be hammered into very fine sheets or foils. 

The wooden door is an opaque object which does not allow any light to pass through it.

• When we look through a sheet of paper with and without oil, we are observing transparency.
• Transparency helps us understand if we can see through a material clearly or if it blocks our view.
• It's like looking through a clean window where you can see outside easily.
• Understanding transparency helps us know how light passes through different materials.

If the particles of a substance have enough energy to partially overcome inter-molecular interactions, then the particles can move about each other while remaining in contact. This describes the liquid state. In a liquid, the particles are still in close contact, so liquids have a definite volume. However, because the particles can move about each other rather freely, a liquid has no definite shape and takes a shape dictated by its container.

• Grouping materials is important because it helps us find and study their properties easily.
• When we group materials based on their similarities and differences, we can understand how they look, feel, and behave.
• For example, grouping all the soft materials together can help us learn about materials that are soft to touch, like cotton or sponge.
• So, by grouping materials, we can learn a lot about them and how they can be used to make different things.

Those substances that have shining surface are called as lustrous substance. Diamond, gold and silver are lustrous

Transparent material is used to make wind screen of a car as it is must to see through them.