Fly ash is a valuable by-product with established applications in construction materials. It is commonly used in manufacturing bricks and as a partial replacement for Portland cement in concrete mixes, improving properties like strength and durability. However, fly ash contains various metal oxides and trace elements, some of which can be toxic.
With reference to 'fly ash' produced by the power plants using coal as fuel, which of the following statements is/are correct? 1. Fly ash can be used in the production of bricks for building construction. 2. Fly ash can be used as a replacement for some of the Portland cement contents of concrete. 3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements. Select the correct answer using the code given below.
Asked in UPSC IAS 2015 · Topic: Pollution (Air Pollution: Types, sources, primary & secondary pollutants, smog, acid rain, effects, control technologies & policies.)
More Environment and Ecology questions
- In the cities of our country, which among the following atmospheric gases are normally considered in calculating the value of Air Quality Index? 1. Carbon dioxide 2. Carbon monoxide 3. Nitrogen dioxide 4. Sulfur dioxide 5. Methane Select the correct answer using the code given below.
- Consider the following statements: 1. Agricultural soils release nitrogen oxides into environment. 2. Cattle release ammonia into environment. 3. Poultry industry releases reactive nitrogen compounds into environment. Which of the statements given above is/are correct?
- Which of the following are the reasons/ factors for exposure to benzene pollution ? 1. Automobile exhaust 2. Tobacco smoke 3. Wood burning 4. Using varnished wooden furniture 5. Using products made of polyurethane Select the correct answer using the code given below :
- Why is there a concern about copper smelting plants? 1. They may release lethal quantities of carbon monoxide into environment. 2. The copper slag can cause the leaching of some heavy metals into environment. 3. They may release sulphur dioxide as a pollutant. Select the correct answer using the code given below.
- With reference to furnace oil, consider the following statements : 1. It is a product of oil refineries. 2. Some industries use it to generate power. 3. Its use causes sulphur emissions into environment. Which of the statements given above are correct?
- Magnetite particles, suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following? 1. Brakes of motor vehicles 2. Engines of motor vehicles 3. Microwave stoves within homes 4. Power plants 5. Telephone lines Select the correct answer using the code given below.
- Consider the following statements : Other than those made by humans, nanoparticles do not exist in nature. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics. Nanoparticles of some commercial products which enter the environment are unsafe for humans. Which of the statements given above is/are correct ?
- Consider the following : Carbon monoxide Nitrogen oxide Ozone Sulphur dioxide Excess of which of the above in the environment is/are cause(s) of acid rain ?