A Science Quiz For Class 4 Students!

Explanation
During the monsoon season, there is typically more rainfall and moisture in the air. This creates ideal conditions for the formation of rainbows. Rainbows occur when sunlight is refracted and reflected by water droplets in the atmosphere, and the abundance of rain during the monsoon season increases the chances of these water droplets being present. 

Explanation
Plants grow from seeds through a process called germination. Seeds contain the necessary nutrients and genetic material for a plant to develop and grow. When a seed is planted in soil and provided with water, sunlight, and the right temperature, it begins to absorb water and swell. This triggers the seed to break open, allowing the embryonic plant inside to emerge and start growing. Over time, the plant develops roots, stems, leaves, and eventually flowers and fruits.

Explanation
Wool is obtained from animals, particularly sheep, and is commonly used to make clothing. It is a natural fiber that is soft and warm and has excellent insulating properties. Wool is known for its ability to regulate body temperature, making it suitable for various climates. It is a popular choice for winter clothing due to its warmth and moisture-wicking properties. Additionally, wool is durable and has good elasticity, making it a versatile material for clothing production.

Explanation
Food consumed by living things is a type of fuel because it provides energy for the body to function. Just like petrol fuels vehicles, food fuels living beings by providing the necessary nutrients and calories that are converted into energy through metabolic processes. This energy is then used for various bodily functions such as movement, growth, and maintenance of body temperature.

Explanation
In order for mid-air refueling to happen, both planes need to be flying at the same speed. If one plane is flying faster or slower than the other, it would be difficult to maintain a stable position for refueling. Therefore, having the planes flying at the same speed is necessary for successful mid-air refueling.

Explanation
Jane could have inherited her brown eyes from her grandmother. Eye color is a hereditary trait that can be passed down from previous generations. Both parents received at least one blue eye gene from one of their grandparents.

Explanation
When a coin is dropped in a glass of water, it will sink. The density of the coin is greater than the density of water. Objects with a higher density than the liquid they are placed in will sink, while objects with a lower density will float. Since the coin is denser than water, it will displace less water than its own weight, causing it to sink to the bottom of the glass.

Explanation
Evaporation is the process in which a substance changes from its liquid state to the gaseous state. This occurs when the substance absorbs enough heat energy to overcome the intermolecular forces holding its molecules together. As a result, the molecules gain enough energy to escape into the surrounding air, forming a vapor. Evaporation commonly occurs at the surface of a liquid, and it is a key component of the water cycle, as well as many industrial and everyday processes.

Explanation
Condensation refers to the process of a substance changing from a gaseous state to a liquid state. This occurs when the temperature of a gas is lowered, causing the gas molecules to lose energy and come closer together, forming a liquid. Condensation is commonly observed when warm air comes into contact with a cooler surface, such as when water vapor in the air condenses on a cold window.

Explanation
Sublimation is the correct answer because it refers to the process in which a substance transitions directly from a solid state to a gaseous state, without passing through the liquid state. This occurs when the substance is heated and the vapor pressure exceeds the atmospheric pressure. Examples of substances that undergo sublimation include dry ice (solid carbon dioxide) and mothballs (solid naphthalene). Evaporation, on the other hand, is the process in which a liquid changes into a gas at a temperature below its boiling point, while melting is the process in which a solid changes into a liquid. Filtration is a completely unrelated process used to separate solid particles from a liquid or gas.