Environmental Chemistry Unit Test

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Environmental Chemistry Unit Test - Quiz

This test will go over the Grade 9 Environment Chemistry Unit with topics such as:
the Nitrogen Cycle Nitrogen Fixation Cellular Respiration Acid & Base Neutralization Macronutrients & Micronutrients Organic and Inorganic Compounds Diffusion Osmosis Active Transport Hydrolysis Subtrates Water Quality PPM (parts per million) *you will need a calculator Biological & Chemical Indicators LD50 Heavy Metals Air Quality Air Pollution (ie. Greenhouse Gases, Global Warming) Harmful Substances Biomagnification WHMIS MSDS Storage and Disposing of Hazardous MaterialGood Luck :)


Questions and Answers
  • 1. 

    Macronutrients mean that nutrients are needed in large amounts.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Macronutrients refer to the essential nutrients that are required by the body in large quantities for proper functioning. These include carbohydrates, proteins, and fats. These nutrients provide the body with energy, support growth and development, and help maintain overall health. Therefore, it is correct to say that macronutrients are needed in large amounts.

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  • 2. 

    What is the primary greenhouse gas responsible for trapping heat in the Earth's atmosphere and contributing to global warming?

    • A.

      Oxygen (O2)

    • B.

      Carbon dioxide (CO2)

    • C.

      Nitrogen (N2) 

    • D.

      Methane (CH4)

    Correct Answer
    A. Oxygen (O2)
  • 3. 

    Micronutrients means that nutrients are needed in __________ amounts. 

    Correct Answer
    small, Small, smaller, Smaller
    Explanation
    Micronutrients refers to essential nutrients that are required by the body in small amounts. These nutrients include vitamins and minerals, which play crucial roles in various bodily functions and overall health. While macronutrients like carbohydrates, proteins, and fats are needed in larger quantities, micronutrients are only needed in small amounts for optimal functioning of the body. Therefore, the correct answer is "small, Small, smaller, Smaller".

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  • 4. 

    What are the most common elements in living things?  

    • A.

      Zinc,Hydrogen,Potassium,Calcium

    • B.

      Carbohydrates, Lipids, Proteins, Nucleic Acids

    • C.

      Fat, Muscles, Organs, Bones

    • D.

      Calcium, Lithium, Potassium, Nitrogen

    Correct Answer
    B. Carbohydrates, Lipids, Proteins, Nucleic Acids
    Explanation
    Carbohydrates, lipids, proteins, and nucleic acids are the most common elements in living things. These biomolecules are essential for the structure, function, and regulation of cells. Carbohydrates are a major source of energy, lipids are important for energy storage and insulation, proteins are involved in various biological processes, and nucleic acids carry genetic information. Together, these biomolecules play crucial roles in the growth, development, and maintenance of living organisms.

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  • 5. 

    Carbohydrates, Lipids, Proteins or Amino Acids, and Nucleic Acids all contain ___________.

    Correct Answer
    carbon, Carbon, C, c
    Explanation
    Carbohydrates, lipids, proteins, amino acids, and nucleic acids all contain carbon. Carbon is a fundamental element present in the structure of these biomolecules, forming the backbone or functional groups. It plays a crucial role in the formation of chemical bonds and contributes to the diversity and complexity of these macromolecules.

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  • 6. 

    Carbohydrates, Lipids, Proteins, Nucleic Acids are also known as __________________

    Correct Answer
    Organic Compounds, organic compounds
    Explanation
    Carbohydrates, lipids, proteins, and nucleic acids are all types of organic compounds. Organic compounds are molecules that contain carbon atoms bonded with other elements such as hydrogen, oxygen, nitrogen, and phosphorus. These compounds are essential for the structure and function of living organisms. Carbohydrates provide energy, lipids are important for storing energy and forming cell membranes, proteins are involved in various cellular processes, and nucleic acids carry genetic information. Therefore, it is correct to refer to carbohydrates, lipids, proteins, and nucleic acids as organic compounds.

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  • 7. 

    Which of these are examples of Carbohydrates?

    • A.

      Meat

    • B.

      Pasta

    • C.

      Rice

    • D.

      Fats

    • E.

      Dairy Products

    • F.

      Bread

    Correct Answer(s)
    B. Pasta
    C. Rice
    F. Bread
    Explanation
    Pasta, rice, and bread are examples of carbohydrates because they are all made primarily of starch, which is a complex carbohydrate. Carbohydrates are one of the three main macronutrients and are a major source of energy for the body. They are found in foods such as grains, fruits, vegetables, and legumes. Meat, fats, and dairy products, on the other hand, are not carbohydrates, as they primarily contain protein or fat.

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  • 8. 

    Which of these are examples of Proteins (Amino Acids)?

    • A.

      Eggs

    • B.

      Fats

    • C.

      Fruits

    • D.

      Dairy Products

    • E.

      Meat

    Correct Answer(s)
    A. Eggs
    D. Dairy Products
    E. Meat
    Explanation
    Proteins are made up of amino acids, and examples of foods that are high in protein include eggs, dairy products, and meat. These foods contain essential amino acids that are necessary for the body's growth, repair, and maintenance. Fats and fruits, on the other hand, are not examples of proteins as they do not contain amino acids in significant amounts.

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  • 9. 

    Which of these are examples of Lipids?

    • A.

      Potatoes

    • B.

      Meat

    • C.

      Vegetables

    • D.

      Fats

    • E.

      Oil

    • F.

      Waxes

    • G.

      Glucose

    Correct Answer(s)
    D. Fats
    E. Oil
    F. Waxes
    Explanation
    Fats, oil, and waxes are examples of lipids because they are all hydrophobic molecules that are insoluble in water. Lipids are an essential component of living organisms and serve various functions such as energy storage, insulation, and protection. Potatoes, meat, vegetables, and glucose are not lipids as they do not possess the characteristic properties of lipids.

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  • 10. 

    Which of these are examples of Nucleic Acids?

    • A.

      RNA

    • B.

      Gas

    • C.

      DNA

    • D.

      Lemon Juice

    • E.

      Household cleaning products

    Correct Answer(s)
    A. RNA
    C. DNA
    Explanation
    RNA and DNA are examples of nucleic acids. Nucleic acids are macromolecules that store and transmit genetic information in living organisms. RNA (ribonucleic acid) is involved in protein synthesis and gene expression, while DNA (deoxyribonucleic acid) carries the genetic instructions for the development and functioning of all known living organisms. Gas, lemon juice, and household cleaning products are not examples of nucleic acids as they do not possess the molecular structure or function of nucleic acids.

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  • 11. 

    Compounds that do not contain carbon are called ___________.

    Correct Answer(s)
    inorganic compounds, Inorganic Compounds
    Explanation
    Compounds that do not contain carbon are referred to as inorganic compounds. These compounds can include minerals, metals, and nonmetals, among others. Inorganic compounds are typically simpler in structure compared to organic compounds, which contain carbon. They play essential roles in various chemical processes and are found in many natural and synthetic materials. The term "inorganic compounds" can be written in lowercase or capitalized, as both are acceptable.

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  • 12. 

    What are the 3 ways that chemicals or nutrients move in living things?

    • A.

      Roots

    • B.

      Photosynthesis

    • C.

      Osmosis

    • D.

      Hydrolysis

    • E.

      Diffusion

    • F.

      Active Transport

    Correct Answer(s)
    C. Osmosis
    E. Diffusion
    F. Active Transport
    Explanation
    Chemicals or nutrients move in living things through three main ways: osmosis, diffusion, and active transport. Osmosis is the movement of water molecules across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. Active transport, on the other hand, requires energy and is the movement of molecules against their concentration gradient, from an area of low concentration to an area of high concentration. These three processes play vital roles in maintaining the balance and functioning of living organisms.

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  • 13. 

    In diffusion, molecules move form an area of _________concentration  to and area of _________ concentration.

    • A.

      Low to High

    • B.

      High to Low

    Correct Answer
    B. High to Low
    Explanation
    In diffusion, molecules naturally move from an area of higher concentration to an area of lower concentration. This is because molecules tend to spread out and become evenly distributed. Therefore, the correct answer is "High to Low".

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  • 14. 

    In Osmosis, molecules of _________ move from an area of ________ concentration to an area of ________ concentration.

    • A.

      Air, high to low

    • B.

      Air, low to high

    • C.

      Water, high to low

    • D.

      Water, low to high

    Correct Answer
    C. Water, high to low
    Explanation
    In osmosis, molecules of water move from an area of high concentration to an area of low concentration. This is because osmosis is the movement of solvent molecules (in this case, water) across a semi-permeable membrane from an area of higher concentration to an area of lower concentration.

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  • 15. 

    In an Active Transport, molecules move from an area of _________ concentration to an are of ________ concentration.

    • A.

      High to Low

    • B.

      Low to High

    Correct Answer
    B. Low to High
    Explanation
    Active transport is a process that requires energy to move molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration. This is in contrast to passive transport, where molecules move down their concentration gradient from an area of higher concentration to an area of lower concentration. Therefore, in active transport, molecules move from an area of low concentration to an area of high concentration.

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  • 16. 

    Which of these transport mechanisms requires energy?

    • A.

      Active Transport

    • B.

      Osmosis

    • C.

      Diffusion

    • D.

      Gas

    Correct Answer
    A. Active Transport
    Explanation
    Active transport is the only transport mechanism among the options that requires energy. Active transport moves molecules or ions against their concentration gradient, from an area of lower concentration to an area of higher concentration, which requires the input of energy. Osmosis, diffusion, and gas transport all occur naturally without the need for energy input.

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  • 17. 

    Carbon dioxide levels have been measured and analyzed. They have been rising since the Industrial Revolution.  What viewpoint is this statement?

    • A.

      Ecological

    • B.

      Economic

    • C.

      Educational

    • D.

      Egocentric

    • E.

      Ethical(Moral)

    • F.

      Health-related

    • G.

      Recreational

    • H.

      Political

    • I.

      Scientific

    • J.

      Technological

    Correct Answer
    I. Scientific
    Explanation
    The given statement about measuring and analyzing carbon dioxide levels and noting their rise since the Industrial Revolution indicates a scientific viewpoint. This viewpoint is based on the collection and analysis of empirical data to understand the phenomenon of rising carbon dioxide levels. It does not involve personal opinions or subjective beliefs, but rather relies on objective observations and scientific methods to draw conclusions.

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  • 18. 

    Countries and governemnt`s around the world signed a contract to help limit sulfur dioxide and nitrogen emissions. What viewpoint is stated?

    • A.

      Ecological

    • B.

      Economic

    • C.

      Educational

    • D.

      Egocentric

    • E.

      Ethical(Moral)

    • F.

      Health-related

    • G.

      Recreational

    • H.

      Political

    • I.

      Scientific

    • J.

      Technological

    Correct Answer
    H. Political
    Explanation
    The viewpoint stated in the given question is political. This can be inferred from the fact that countries and governments signed a contract to address the issue of limiting sulfur dioxide and nitrogen emissions. This suggests that the decision and action taken are driven by political considerations and agreements between different nations and their governments.

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  • 19. 

    A bag of garden fertilizer has the laberl 5-18-10. These 3 numbers on a fertilizer label represent the percent composition of:

    • A.

      Nitrogen, phosphorus, and potassium

    • B.

      Nitrogen, sodium, and potassium

    • C.

      Carbon, phosphorus, and hydrogen

    • D.

      Carbon, oxygen and hydrogen

    Correct Answer
    A. Nitrogen, phosphorus, and potassium
    Explanation
    The numbers on a fertilizer label represent the percent composition of nitrogen, phosphorus, and potassium. In this case, the label 5-18-10 indicates that the fertilizer contains 5% nitrogen, 18% phosphorus, and 10% potassium. These three nutrients are essential for plant growth and are commonly found in fertilizers to provide the necessary elements for healthy plant development.

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  • 20. 

    Purified wastewater that is released into rivers or lakes is known as:

    • A.

      Sewage

    • B.

      Effluent

    • C.

      Septic sludge

    • D.

      Storm runoff

    Correct Answer
    B. Effluent
    Explanation
    Effluent refers to the purified wastewater that is released into rivers or lakes. It is the final product of the treatment process, where impurities and contaminants are removed from the wastewater to make it safe for discharge into the environment. This term is commonly used in the context of wastewater treatment plants, where the treated water is referred to as effluent before it is released into natural bodies of water.

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  • 21. 

    Vinegar has a pH reading of 2.2 and is considered a________.

    • A.

      Strong base

    • B.

      Strong acid

    • C.

      Weak base

    • D.

      Weak acid

    Correct Answer
    B. Strong acid
    Explanation
    Vinegar has a pH reading of 2.2, which is significantly below 7 (the neutral pH). This indicates that vinegar is highly acidic. Therefore, the correct answer is "strong acid."

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  • 22. 

    Since temperature affects oxygen concentration, when the temperature of water is low then the ______ (more or less) oxygen it can hold.

    Correct Answer
    more, More
    Explanation
    When the temperature of water is low, it can hold more oxygen. This is because colder water molecules are closer together, allowing for more oxygen molecules to dissolve in the water. As the temperature increases, the water molecules move further apart, reducing the amount of oxygen that can be dissolved. Therefore, the correct answer is that when the temperature is low, water can hold more oxygen.

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  • 23. 

    ____________ are used to kill or control weeds form growing.

    • A.

      Herbicides

    • B.

      Weed Poison

    • C.

      Hydrolysis

    • D.

      Photosynthesis

    Correct Answer
    A. Herbicides
    Explanation
    Herbicides are chemicals that are used to kill or control weeds from growing. They are specifically designed to target and eliminate unwanted plants, while minimizing damage to desirable plants. Herbicides work by interfering with the growth and development of weeds, either by inhibiting essential enzymes or disrupting their metabolic processes. This ultimately leads to the death or suppression of weeds, allowing for the healthy growth of desired plants.

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  • 24. 

    ___________ are used to remove sulfur dioxide emissions.

    Correct Answer
    scrubbers, Scrubbers
    Explanation
    Scrubbers, also known as scrubbers, are used to remove sulfur dioxide emissions.

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  • 25. 

    What are the 4 different types of Greenhouse gases?

    • A.

      The Greenhouse Effect

    • B.

      The Enhanced Greenhouse Effect

    • C.

      Global Warming

    • D.

      Chlorofluorocarbons (CFC's)

    • E.

      Carbon Monoxide

    • F.

      Fossil Fuels

    • G.

      Pollution

    Correct Answer(s)
    A. The Greenhouse Effect
    B. The Enhanced Greenhouse Effect
    C. Global Warming
    D. Chlorofluorocarbons (CFC's)
    Explanation
    The correct answer is the Greenhouse Effect, the Enhanced Greenhouse Effect, Global Warming, and Chlorofluorocarbons (CFC's). These four options are the different types of greenhouse gases. The Greenhouse Effect refers to the natural process where certain gases trap heat in the Earth's atmosphere. The Enhanced Greenhouse Effect is the result of human activities, such as burning fossil fuels, which increase the concentration of greenhouse gases and intensify the warming effect. Global Warming is the long-term increase in Earth's average temperature due to the Enhanced Greenhouse Effect. Chlorofluorocarbons (CFC's) are synthetic gases used in aerosols and refrigerants that are potent greenhouse gases.

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  • 26. 

    _________________ has contributed to the thinning of the ozone layer because of our use of chemicals.

    Correct Answer(s)
    CFC's
    cfc's
    Chlorofluorocarbons
    chlorofluorocarbons
    Explanation
    CFC's (Chlorofluorocarbons) have contributed to the thinning of the ozone layer because of our use of these chemicals.

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  • 27. 

    As a result of the ozone layer's thinning, there will be a greater exposure to ________________ on the Earth's surface causing harmful effects on organisms.

    Correct Answer(s)
    uv radiation, UV Radiation, UV radiation, uv Radiation
    Explanation
    As a result of the ozone layer's thinning, there will be a greater exposure to UV radiation on the Earth's surface causing harmful effects on organisms. UV radiation refers to the high-energy rays from the sun that can cause sunburn, skin cancer, and damage to the DNA of living organisms. With the ozone layer becoming thinner, more UV radiation can penetrate the atmosphere and reach the Earth's surface, posing a threat to the health and well-being of living organisms.

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  • 28. 

    _________is produced when we burn fossil fuels.

    • A.

      Air pollution

    • B.

      Global Warming

    • C.

      Acid Rain

    • D.

      Carbon Dioxide

    Correct Answer
    C. Acid Rain
    Explanation
    When fossil fuels are burned, they release sulfur dioxide and nitrogen oxides into the atmosphere. These gases react with water vapor and other chemicals in the air to form sulfuric acid and nitric acid. These acids then mix with precipitation, such as rain, snow, or fog, and fall to the ground as acid rain. Acid rain can have harmful effects on the environment, including damaging forests, lakes, and buildings.

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  • 29. 

    Acid rain is produced when we burn fossil fuels, it then releases ____________ and _________ into the atmosphere.

    • A.

      SO2 and NOx

    • B.

      SO2 and O2

    • C.

      Nox and CO2

    • D.

      CO2 and O2

    Correct Answer
    A. SO2 and NOx
    Explanation
    When fossil fuels are burned, they release sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere. These gases combine with water vapor in the air to form sulfuric acid and nitric acid, which then fall to the ground as acid rain.

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  • 30. 

    Acid rain causes the water to become __________.

    Correct Answer
    acidic, Acidic
    Explanation
    Acid rain is a type of pollution that occurs when pollutants in the air, such as sulfur dioxide and nitrogen oxide, react with water vapor and other chemicals in the atmosphere. This reaction forms acidic compounds, such as sulfuric acid and nitric acid, which then fall to the ground as rain. As a result, the water becomes acidic, meaning it has a low pH level. This can have harmful effects on aquatic life, plants, and even buildings and infrastructure.

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  • 31. 

    Acid rain causes water to absorb the __________ which then makes it from the soil into lakes and streams.

    Correct Answer
    Aluminum
    aluminum
    Al
    Explanation
    Acid rain contains high levels of acidity, which can cause the soil to release aluminum ions. These aluminum ions are then absorbed by water, leading to an increase in aluminum concentration in lakes and streams. This can have detrimental effects on aquatic life, as high levels of aluminum can be toxic to many organisms.

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  • 32. 

    In a Sewage Treatment Plant, the first place sewage goes to is ____________

    • A.

      Head works

    • B.

      Primary Treatment

    • C.

      Bio-reactors

    • D.

      Tertiary Treatment

    Correct Answer
    A. Head works
    Explanation
    In a Sewage Treatment Plant, the first place sewage goes to is the head works. The head works is the initial stage of the treatment process where the sewage enters the plant and undergoes preliminary treatment. This includes processes such as screening to remove large objects, grit removal to separate sand and gravel, and flow measurement. The head works prepare the sewage for further treatment in the plant, making it an essential step in the overall sewage treatment process.

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  • 33. 

    In a Sewage Treatment Plant, the second place sewage goes to is ____________.

    • A.

      Primary Treatment

    • B.

      Secondary Treatment

    • C.

      Tertiary Treatment

    • D.

      Headworks

    Correct Answer
    A. Primary Treatment
    Explanation
    In a Sewage Treatment Plant, the second place sewage goes to is the Primary Treatment. This is the initial stage of treatment where physical processes like screening, sedimentation, and filtration are used to remove large solids, grit, and debris from the sewage. The primary treatment helps in reducing the organic content and suspended solids in the wastewater before it moves on to the next stage of treatment.

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  • 34. 

    In the Primary Treatment, a ___________ is used to settle and skim sewage for approximately 3 hours.

    Correct Answer
    Primary Clarifiers, primary clarifiers, Primary clarifiers, primary clarifier, Primary clarifier, Primary Clarifier
    Explanation
    In the Primary Treatment process, primary clarifiers are used to settle and skim sewage for approximately 3 hours. These clarifiers are large tanks where wastewater flows slowly, allowing solid particles to settle to the bottom and form a sludge layer. The sludge is then scraped off and removed, while the clarified water is skimmed from the top. The use of primary clarifiers helps remove a significant amount of suspended solids and organic matter from the sewage before it undergoes further treatment processes.

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  • 35. 

    In a Sewage Treatment Plant, the third place sewage travels to is the ____________.

    • A.

      Bioreactors microbes

    • B.

      Tertiary Treatment

    • C.

      Third Clarifiers

    • D.

      River

    Correct Answer
    A. Bioreactors microbes
    Explanation
    In a Sewage Treatment Plant, after undergoing primary and secondary treatment processes, the third stage involves the use of bioreactors microbes. These microbes help to further break down and remove any remaining organic matter and pollutants from the sewage. This is an important step in the treatment process to ensure that the water is safe to be discharged back into the environment or reused for other purposes.

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  • 36. 

    The fourth place sewage goes to in a Sewage Treatment Plant is in  _______________.

    • A.

      Fourth Treatment

    • B.

      Tetriary Treatment

    • C.

      Secondary Treatment

    • D.

      Fourth Clarifiers

    Correct Answer
    C. Secondary Treatment
    Explanation
    In a sewage treatment plant, the fourth place where sewage goes to is the secondary treatment. This stage involves the removal of organic matter and suspended solids from the wastewater. During secondary treatment, biological processes such as activated sludge or trickling filters are used to break down and remove pollutants. This step helps to further purify the wastewater before it moves on to the next treatment processes.

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  • 37. 

    Bioreactors microbes and air eat the dissolved ____________.

    Correct Answer
    nutrients, Nutrients
    Explanation
    Bioreactors are designed to support the growth of microbes, which require nutrients to survive and thrive. These nutrients are dissolved in the medium within the bioreactor. The microbes consume these dissolved nutrients as a source of energy and building blocks for their own growth and metabolism. Therefore, the correct answer is "nutrients". The capitalized "Nutrients" is likely a typographical error and should be considered the same as "nutrients" in this context.

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  • 38. 

    Microbes in a Sewage Treatment Plant settle to the bottom of the tank, where ___________ is also located.

    Correct Answer
    sludge, Sludge
    Explanation
    Microbes in a sewage treatment plant settle to the bottom of the tank, where sludge is also located. Sludge refers to the solid waste material that accumulates at the bottom of the tank during the sewage treatment process. It consists of organic and inorganic matter, including the microbes that have been removed from the wastewater. This sludge needs to be further processed and treated before it can be safely disposed of or used for beneficial purposes, such as fertilizer or energy production.

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  • 39. 

    The fifth place sewage goes to in a Sewage Treatment Plant, is in the ________________.

    • A.

      River

    • B.

      Tertiary Treatment

    • C.

      Fifth Treatment

    • D.

      Secondary Treatment

    Correct Answer
    B. Tertiary Treatment
    Explanation
    In a Sewage Treatment Plant, the sewage goes through several stages of treatment to remove impurities and contaminants. The fifth place where the sewage goes is the Tertiary Treatment. Tertiary treatment is the final stage of treatment where advanced methods are used to further remove any remaining solids, organic matter, and harmful substances from the wastewater. This stage ensures that the treated water is of high quality and can be safely discharged into the environment or reused for various purposes.

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  • 40. 

    In the Tertiary Treatment, the effluent (treated wastewater) goes to the __________________ process for further treatment.

    • A.

      Sanitation Center

    • B.

      Ultra violet sun

    • C.

      UV Disinfection

    • D.

      Reproduction center

    Correct Answer
    C. UV Disinfection
    Explanation
    In the Tertiary Treatment, the effluent (treated wastewater) goes to the UV Disinfection process for further treatment. UV disinfection is a method that uses ultraviolet light to kill or inactivate microorganisms in the water. This process helps to remove any remaining bacteria, viruses, and parasites that may still be present in the treated wastewater, ensuring that it is safe for discharge or reuse.

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  • 41. 

    In a Sewage Treatment Plant, UV exposure changes the ________ structure so they can't reproduce.

    Correct Answer
    DNA, dna
    Explanation
    UV exposure can cause damage to the DNA structure, specifically by creating thymine dimers. These dimers prevent the DNA strands from separating properly during replication, leading to errors and mutations. As a result, the damaged DNA cannot effectively reproduce, inhibiting the growth and replication of the microorganisms in the sewage treatment plant.

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  • 42. 

    In a Sewage Treatment Plant, the final place effluent goes to is the ________.

    • A.

      River

    • B.

      Garbage

    • C.

      Drinking water

    Correct Answer
    A. River
    Explanation
    In a Sewage Treatment Plant, the final place where the effluent goes to is the river. After undergoing various treatment processes, the sewage is discharged into the river. This is done to ensure that the treated effluent is diluted and dispersed in a large water body, minimizing its impact on the environment. Discharging into a river also allows for further natural purification processes to take place as the water flows downstream.

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  • 43. 

    1 mL of food colouring was put into a solution of 99 mL of water. What is the concentration of food colouring in Parts per Million (ppm)? *Answer does not need to include "ppm".

    Correct Answer
    100
    Explanation
    To find the concentration of food coloring in parts per million (ppm), we first consider that 1 milliliter (mL) of food coloring was added to 99 mL of water, making a total solution volume of 100 mL. Given that water has a density of 1 gram per milliliter, 1 mL of water has a mass of 1 gram.
    Since the ratio of food coloring to total solution is 1:100, the mass of food coloring in the solution is 1/100 of 1 gram. To convert this to ppm, we use a formula that relates the mass of the solute (in this case, the food coloring) to the mass of the solution (the total volume of water and food coloring), then multiply by 10^6 to express the result in parts per million.
    Plugging in the values, we find that the concentration of food coloring is 100 parts per million (ppm), meaning that for every million parts of the solution, 100 parts consist of food coloring.

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  • 44. 

    In Biomagnification, if it were to take place on a farm, the primary consumer of the pest infected wheat would be the __________.

    • A.

      Rooster

    • B.

      Mice

    • C.

      Chicken

    • D.

      Weasel

    Correct Answer
    B. Mice
    Explanation
    In Biomagnification, the process of toxins accumulating in higher levels of a food chain, the primary consumer of the pest-infected wheat on a farm would be mice. This is because mice are commonly found in agricultural areas and are known to feed on grains and crops. As the primary consumer, they would be the first to ingest the pesticides or toxins present in the wheat, which can then bioaccumulate and have harmful effects on the mice and potentially on the organisms that consume them.

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  • 45. 

    What element do bacteria remove from a PCB molecule?

    Correct Answer
    Cl, Chlorine, chlorine
    Explanation
    Bacteria remove chlorine (Cl) from a PCB (polychlorinated biphenyl) molecule.

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  • 46. 

    Sunflowers were used at Chernobyl to help reduce radioactive substances from groundwater. Which method of reducing pollutants is this?

    • A.

      Hyrdolysis

    • B.

      Biodegration

    • C.

      Photolysis

    • D.

      Phytormediation

    Correct Answer
    D. Phytormediation
    Explanation
    Phytoremediation is the process of using plants to remove, degrade, or immobilize pollutants from soil, water, or air. In this case, sunflowers were used at Chernobyl to help reduce radioactive substances from groundwater. Sunflowers have the ability to absorb and accumulate heavy metals and radioactive contaminants from the soil through their roots. The contaminants are then stored in the plant's tissues or broken down by the plant's natural processes. Therefore, the use of sunflowers in this context is an example of phytoremediation.

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  • 47. 

    A potato will decay faster in ________  (warmer or colder) soil during the decomposition process. 

    Correct Answer
    warmer, Warmer
    Explanation
    A potato will decay faster in warmer soil during the decomposition process because higher temperatures speed up the metabolic activities of microorganisms and enzymes responsible for breaking down organic matter. Warmer conditions provide an optimal environment for these organisms to thrive and accelerate the decay process. In colder soil, the metabolic activities slow down, leading to slower decomposition rates.

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  • 48. 

    What does LD50 stand for?

    • A.

      Lethal dose, killing 50% of population

    • B.

      Legal dose, killing 50% of population

    • C.

      Legal dose, with 50% of drugs

    • D.

      Lethal dose, with 50% drugs

    Correct Answer
    A. Lethal dose, killing 50% of population
    Explanation
    LD50 stands for Lethal dose, killing 50% of population. It is a measure used in toxicology to determine the lethal dose of a substance that would kill 50% of the test population. This measure helps in assessing the toxicity of a substance and determining its potential harm to living organisms.

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  • 49. 

    Some fertilizers have a fourth number and the letter "S" on the label indicating that they contain _________.

    Correct Answer
    Sulfur, surlfur
    Explanation
    The fourth number and the letter "S" on the label of some fertilizers indicate that they contain sulfur. Sulfur is an essential nutrient for plants, as it plays a crucial role in protein synthesis, enzyme activity, and chlorophyll formation. It is particularly important for crops like onions, garlic, and cruciferous vegetables. Sulfur deficiency can lead to stunted growth and reduced crop yield. Therefore, the presence of sulfur in fertilizers helps to ensure that plants receive an adequate supply of this essential nutrient.

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  • 50. 

    What are the 3 products of fuel combustion? Hyrdrocarbon + Oxygen= ________+_________+________

    • A.

      CO2+H20+energy

    • B.

      02+CO2+H20

    • C.

      CH4+202+CO2

    • D.

      S+NOx+energy

    Correct Answer
    A. CO2+H20+energy
    Explanation
    The correct answer is CO2+H20+energy. When fuel combustion occurs, hydrocarbon and oxygen react to form carbon dioxide (CO2), water (H2O), and release energy. This is a common process in the combustion of fossil fuels and other organic materials.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 08, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 21, 2012
    Quiz Created by
    Smartiecheez
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