Social Science MCQ Quiz For Primary School Students

The sun is the primary source of heat energy for the Earth. Through the process of nuclear fusion, the sun produces an immense amount of heat and light energy. This energy is radiated outwards in all directions, and a portion of it reaches the Earth. The heat energy from the sun warms the Earth's surface, causing various weather patterns and supporting the existence of life on our planet. The moon, Mars, and Venus do not emit significant amounts of heat energy, making the sun the correct answer.

The correct answer is atmosphere. The atmosphere is the envelope of air that surrounds the Earth. It is composed of different layers, including the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The atmosphere plays a crucial role in protecting and sustaining life on Earth by regulating temperature, providing oxygen for respiration, and filtering harmful ultraviolet radiation from the sun.

The word "climate" is derived from the Greek word "clima". The term "clima" in Greek refers to an inclination or slope, which is a metaphorical representation of the Earth's varying climates across different regions. This word accurately captures the concept of climate as the average weather patterns and conditions in a specific area.

Meteorology is the study of weather patterns, climate, and atmospheric conditions. It involves analyzing and predicting weather phenomena such as temperature, precipitation, wind patterns, and atmospheric pressure. This field of study is crucial for understanding and forecasting weather events, which helps in making informed decisions related to agriculture, transportation, disaster management, and various other sectors. Ecology is the study of the relationships between organisms and their environment, archaeology focuses on studying human history through artifacts, and sociology deals with the study of human society and social behavior.

The term "biosphere" refers to the zone on Earth where life exists. It encompasses all living organisms, their habitats, and the interactions between them. The options provided in the question, such as land, atmosphere, and water, are all components of the biosphere. However, the most accurate and comprehensive answer is "Life on Earth" as it directly represents the concept of the biosphere and includes all the other elements mentioned.

A barometer is used to measure pressure in the air. It consists of a glass tube filled with mercury or a liquid, with one end sealed and the other end open to the atmosphere. As the air pressure changes, it exerts a force on the liquid, causing it to rise or fall in the tube. By measuring the height of the liquid, the air pressure can be determined. Barometers are commonly used in weather forecasting to monitor changes in atmospheric pressure, which can indicate the likelihood of rain, storms, or other weather conditions.

The composition of oxygen in air is 21%. This means that out of the total volume of air, 21% of it is made up of oxygen. The remaining percentage is made up of other gases such as nitrogen, carbon dioxide, and trace amounts of other gases. Oxygen is essential for the survival of most living organisms, as it is used in the process of respiration to produce energy.

Wind energy is a form of renewable energy because it is generated by harnessing the power of wind, which is a natural resource that is constantly replenished. Unlike fossil fuels, which are finite and non-renewable, wind energy can be continuously produced as long as there is wind. This makes wind energy a sustainable and environmentally friendly option for generating electricity.

World Ozone Day is celebrated on September 16 each year to commemorate the signing of the Montreal Protocol in 1987, an international treaty designed to protect the ozone layer by phasing out the production of numerous substances responsible for ozone depletion. This day raises awareness about the importance of the ozone layer and encourages actions to protect it.

The correct answer is five because the atmosphere is commonly divided into five layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has its own unique characteristics and plays a crucial role in the Earth's climate and weather patterns.