A. Choose the correct option(s) in each. 1. Which among the following is the cleanest fuel? (a) coal (b) petrol (c) diesel (d) CNG 2. Which coal produces the lowest amount of heat? (a) lignite (b) peat (c) anthracite (d) bituminous coal 3. Which of these is an example of a non-renewable resource? (a) trees (b) water (c) coal (d) grass 4. A natural fuel formed from deposits of carbon as plants decomposed millions of years ago. (a) coal (b) petroleum (c) natural gas (d) wood 5. Which of the following is a renewable energy resource? (a) solar (b) methane (c) crude oil (d) coal 6. What is the leading source of energy used in the United States today? (a) coal (b) oil resources (c) natural gas (d) nuclear power 7. Burning of which of the following fuels produces the least amount of carbon dioxide per unit of energy? (a) coal (b) oil (c) natural gas (d) all of these produce the same amount of carbon dioxide 8. Dead organisms are transformed into petroleum and natural gas in (a) absence of air (b) presence of air (c) presence of sunlight (d) none of these 9. Diesel is used in (a) cooking oil (b) paints (c) road surfacing (d) electric generators 10. Which of these is used in extraction of metals? (a) Coke (b) Coal gas (c) Coal tar (d) Petroleum 11. Which of these is used as solvent for dry cleaning? (a) Diesel (b) Kerosene (c) Petrol (d) Paraffin wax 12. The fibres manufactured by petrochemicals are (a) Nylon (b) Polyester (c) Acrylic (d) All of these B. Fill in the blanks: 1. Fuels which are formed by the decomposition of dead plants and animals are called ________. 2. The places where coal deposits are found are called ________.
Answer (1)
A. Choose the correct option(s) in each.
Which among the following is the cleanest fuel?
(d) CNG - Compressed Natural Gas (CNG) burns cleaner than coal, petrol, and diesel, producing fewer pollutants.
Which coal produces the lowest amount of heat?
(b) peat - Peat is considered the stage before coal and contains the least carbon content, hence producing the lowest amount of heat.
Which of these is an example of a non-renewable resource?
(c) coal - Coal is a non-renewable resource as it takes millions of years to form.
A natural fuel formed from deposits of carbon as plants decomposed millions of years ago.
(a) coal - Coal is formed from ancient plants and is a carbon-rich natural fuel.
Which of the following is a renewable energy resource?
(a) solar - Solar energy is renewable as it is derived from the sun’s rays, which are inexhaustible.
What is the leading source of energy used in the United States today?
(b) oil resources - Oil is the leading energy source in the U.S., providing a significant part of the energy mix.
Burning of which of the following fuels produces the least amount of carbon dioxide per unit of energy?
(c) natural gas - Natural gas produces the least CO2 emissions per unit of energy compared to coal and oil.
Dead organisms are transformed into petroleum and natural gas in
(a) absence of air - This transformation occurs under anaerobic conditions, or absence of air, over millions of years.
Diesel is used in
(d) electric generators - Diesel is commonly used in generators to produce electricity.
Which of these is used in extraction of metals?
* **(a) Coke** - Coke is used in metallurgical processes like smelting to extract metals.
Which of these is used as solvent for dry cleaning?
* **(c) Petrol** - Petrol, particularly in the form of specialized solvents, can be used for dry cleaning.
The fibres manufactured by petrochemicals are
* **(d) All of these** - Nylon, Polyester, and Acrylic are all synthetic fibers made from petrochemicals.
B. Fill in the blanks:
Fuels which are formed by the decomposition of dead plants and animals are called fossil fuels .
The places where coal deposits are found are called coal mines .
This question falls under the subject of Chemistry as it involves understanding various types of fuels, their properties, and formation, which are all essential topics in chemistry studies, especially at the high school level.
