Olympiad Test Level 1: Water and Rocks - 2 - Class 2 MCQ

Explanation:
The correct answer is C: Wax.
Here is a detailed explanation:
- Candles are made from a solid substance called wax.
- Wax is a type of organic compound that can be derived from various sources such as animal fats, plant oils, or petroleum.
- The most common type of wax used in candle-making is called paraffin wax, which is derived from petroleum.
- Other types of wax that can be used include beeswax, soy wax, and palm wax.
- The wax is melted and then poured into a mold or container, where it solidifies as it cools down.
- The wick, which is typically made of cotton or another fibrous material, is inserted into the solidified wax.
- When the wick is lit, the heat from the flame melts the wax near the wick, creating a pool of liquid wax.
- This liquid wax is drawn up the wick and vaporized by the heat of the flame, producing light and heat.
- As the wax is consumed, the candle gradually burns down, with the solid wax being converted into liquid wax and then into gas.
- The process continues until all the wax is consumed or the flame is extinguished.
In conclusion, candles are a solid form of wax.

T-shirt is made of fabric while others are made of wood.

Rain is an example of liquid water. Ice is solid water. Frost is thin layer of ice, it is also a form of solid water. Steam is gaseous water.

Matter can be changed from one form to another by heating and cooling. For example, water changes into water vapour on heating and changes into ice on cooling.

Glass is an example of transparent object.

Milk is a liquid matter, others are solid matter.

An apple is an example of solid matter.

Solids have fixed shapes and sizes.

On heating water changes into water vapour.

Magazines are made up of paper.

Raincoats are made of plastic because plastic is waterproof. Cars are made of metal. Belts are made of leather. Envelopes are made of paper.

Vapour is the gas form of water.
Explanation:
- Water exists in three states: solid, liquid, and gas.
- Vapour refers to the gaseous state of water.
- When water is heated, it gains energy and its molecules move faster, leading to the transition from liquid to gas.
- At the boiling point, water molecules have enough energy to break free from the liquid phase and escape into the air as vapour.
- Vapour is invisible to the naked eye, but it can condense into visible water droplets when it cools down or comes into contact with a cool surface.
- Vapour can be found naturally in the atmosphere, such as in the form of clouds or fog.
- It can also be artificially generated through processes like boiling water or using humidifiers.
- Vapour is an essential component of the water cycle, where water evaporates from bodies of water, condenses in the atmosphere, and eventually falls back to the Earth as precipitation.
- Vapour plays a crucial role in regulating the Earth's climate and weather patterns.