An Amazing Science Quiz For All Kids!

Explanation
Mass is the measure of matter in an object. It represents the amount of material present in an object and is often measured in kilograms. Mass is different from weight, as weight is the force exerted on an object due to gravity. Mass remains constant regardless of the location, while weight can vary depending on the strength of gravity.

Explanation
Evaporation is the process in which a liquid changes into a vapor when heated. This occurs when the molecules of the liquid gain enough energy to break the intermolecular forces holding them together and escape into the air as gas. Evaporation is a natural process that happens at any temperature, but it occurs more rapidly at higher temperatures. It is an important part of the water cycle and is responsible for the formation of clouds, rainfall, and the cooling effect of sweating.

Explanation
An example of a liquid is water. Water is a substance that has a definite volume but no definite shape, conforming to the shape of its container. It flows easily and can be poured, making it a clear example of a liquid.

Explanation
The correct answer is "Freezing." Freezing refers to the process in which a liquid changes into a solid state due to a decrease in temperature. This change is characterized by the formation of ice crystals and a decrease in the liquid's viscosity. It is a common phenomenon observed in substances like water when exposed to low temperatures.

Explanation
An example of a solid is stone because it has a definite shape and volume, and its particles are closely packed together. Unlike gases, which do not have a definite shape or volume, and liquids like rain, which have a definite volume but not a definite shape, solids maintain their shape and do not flow. Stone, being a solid material, exemplifies these characteristics.

Explanation
Wood is a solid because it has a definite shape and volume. Unlike liquids or gases, wood cannot be easily compressed or poured. It maintains its form and structure, making it a solid material.

Explanation
Glass is considered hard compared to cotton and flower because it is a solid material that is rigid and not easily deformed. It has a high level of hardness and can withstand pressure and impact without breaking or bending. Cotton, on the other hand, is a soft and flexible material, while flowers are delicate and fragile.

Explanation
Coal is a solid fuel because it exists in a solid state at room temperature and is commonly used for heating and energy production. Gas stove and kerosene stove, on the other hand, are not solid fuels as they rely on gaseous or liquid substances for combustion.

Explanation
LPG (liquefied petroleum gas) is a gaseous fuel commonly used for heating, cooking, and in vehicles. It is a mixture of propane and butane, which are both gases at room temperature and pressure. Vegetable oil and petrol, on the other hand, are liquid fuels. Therefore, LPG is the only option among the given choices that is a gaseous fuel.

Explanation
A cloud is an example of a gas because it is composed of tiny water droplets or ice crystals suspended in the air. Clouds form when warm air rises and cools, causing the water vapor in the air to condense into visible water droplets or ice crystals. This process occurs in the atmosphere, where gases such as water vapor can exist in their gaseous state. Therefore, a cloud is a visible mass of gas.