Olympiad Test: Our Necessities -2 - Free MCQ with solutions Class 4 Science

Slanting roofs are designed to help with weather conditions. Here are some key points about them:

• Do not collect snow or rain water, which helps prevent damage.
• They allow rain water to flow off easily.
• They help keep the house warm and cosy.

So, slanting roofs are very useful for keeping homes safe and comfortable!

Bricks are made by baking clay in a special oven called a kiln. A kiln heats the clay to very high temperatures, which makes the bricks strong and durable. Other options like furnaces and electric ovens are not used for this purpose. Open furnaces are also not suitable for baking bricks.

An elevated house on bamboo poles is built in areas where there is a risk of flooding. This design helps keep the house safe and dry during heavy rains. In places where floods are common, such houses are very useful because:

• They stay above the water level.
• They protect the home from water damage.
• They allow people to live comfortably even during rainy seasons.

So, these houses are mostly found in regions that experience heavy rainfall and floods.

In Japan, houses are mostly made of wood because of the country's frequent earthquakes. Wooden houses are lighter and can absorb shocks better than houses made of heavy materials. This makes them safer during an earthquake. Additionally, wood is a traditional building material in Japan, which has been used for many years.

To keep the walls of a house safe from rain and sun, it is important to use a coating.

• Paint is the best choice for this job.
• Paint forms a protective layer that helps prevent damage.
• It keeps the walls looking nice and can come in many colours.
• Other options like clay, oil, or vinegar are not effective for this purpose.

Kuccha houses are made using unbaked bricks. These bricks are not fired in a kiln like baked bricks, making them less durable. Kuccha houses are often found in rural areas and are easily built with local materials.

Pucca houses are strong and durable buildings commonly found in many places. They are built using materials that make them sturdy and long-lasting.

The main materials used for constructing pucca houses are:

• Baked bricks - These are bricks that are heated in a kiln to make them hard and strong.
• Cement and concrete - These materials help to bind the bricks together and make the structure solid.
• Steel - Sometimes, steel is used to provide extra strength to the building.

Unlike other types of houses, pucca houses are not made from unbaked bricks, mud, or straw. This is why they are often more reliable in bad weather and can last for many years.

Igloos are built using ice. This material is very cold and hard, which helps keep the inside warm. The blocks of ice are carefully shaped and stacked to form a dome. Igloos are often found in cold places like the Arctic, where people known as Inuit traditionally live. They use igloos for shelter because they can keep out the harsh winter weather and provide a warm place to stay. The design of an igloo is clever, allowing it to trap heat from inside while protecting against the cold outside.

The windows should be placed in the opposite direction to the door for several important reasons:

• To let more light into the house, making it brighter.
• To facilitate cross ventilation, which helps in keeping the air fresh and cool.
• This arrangement also helps in creating a good flow of air throughout the rooms.

Having windows facing the opposite way from the door is a smart choice for a comfortable and pleasant home.

A high roof in a house has several benefits:

• Good for rains: It helps to keep the water from pooling on the roof.
• Keeps it warm in winter: A high roof allows warm air to rise, making the rooms below warmer.
• Keeps it cold in summer: It helps to create better airflow, keeping the house cooler.

Therefore, a high roof is beneficial for all these reasons.