Test: Pollution - Class 9 MCQ

Radioactive pollution involves the release of radioactive substances, such as those from nuclear power plants or accidents, into the environment, which can have long-lasting and harmful effects.

Excessive carbon dioxide emissions from burning fossil fuels trap heat in the atmosphere, leading to global warming and climate change, which disrupts weather patterns.

In urban areas, industrial emissions and vehicle exhaust are primary contributors to air pollution, leading to health issues and environmental degradation, particularly in densely populated regions.

Secondary pollutants are formed when primary pollutants react with other substances in the environment. An example is peroxyacetyl nitrate, which forms when hydrocarbons react with sunlight.

Primary pollutants are those that are released directly into the environment without any prior transformation. Examples include sulfur dioxide and methane, which can directly impact air quality.

Volcanic eruptions are a natural source of air pollution, releasing ash and gases into the atmosphere that can significantly affect air quality and climate.

Pesticides are chemical agents that can contaminate water bodies when they wash off from agricultural fields, posing risks to aquatic life and human health.

Agricultural chemicals, particularly fertilizers and pesticides, significantly contribute to soil pollution by altering its natural properties and affecting its productivity.

Smog is a type of air pollution that results from a mixture of fog, smoke, and dust particles. It often occurs in urban areas where industrial emissions and vehicle exhaust combine with humidity, reducing visibility and causing health issues.

Water pollution can lead to algal blooms, which deplete oxygen levels in water bodies, negatively impacting fish and other aquatic organisms by creating dead zones where life cannot be sustained.

Biodegradable pollutants, such as sewage, can be broken down by natural processes, particularly by microbial action. This is in contrast to non-biodegradable pollutants, like plastic, which take a long time to decompose.

Sulfur dioxide is a primary pollutant that is directly emitted from sources like factories and vehicles, contributing to air quality issues and respiratory problems.

Noise pollution refers to any loud, unwanted sound that can cause stress or irritation to individuals, often arising from transportation, industrial activities, and public events.

Quantitative pollutants, such as carbon dioxide, are naturally occurring substances that become harmful when their concentrations exceed natural levels, contributing to environmental issues like climate change.

Non-biodegradable pollutants, such as plastics and metals, do not decompose easily and can persist in the environment for many years, leading to significant pollution issues.

Noise pollution can lead to hearing loss and other health issues such as stress, anxiety, and sleep disturbances due to continuous exposure to loud sounds.

Human activities, such as industrial processes, agriculture, and improper waste disposal, are the main contributors to soil pollution, affecting its quality and fertility.

Water pollution occurs when harmful substances contaminate water bodies, making them unsafe for human use and aquatic life, often due to industrial waste and agricultural runoff.

Pollution refers to the introduction of harmful or toxic substances into the environment, leading to unfavorable changes in the physical, chemical, or biological characteristics of our surroundings. This can disrupt ecosystems and affect the health of living organisms.

Qualitative pollutants are substances that are not naturally present in the environment and are introduced through human activities, such as industrial waste and chemical fertilizers.