Power Resources — Set 4

Correct Answer: A. Firewood

• **Firewood** = NOT a fossil fuel; it is a biomass fuel harvested from living trees, unlike coal, oil, and natural gas formed from ancient buried organisms. • **Fossil fuel definition** — formed from organic remains buried millions of years ago under heat and pressure; coal, petroleum, and natural gas are the three main fossil fuels. • 💡 Wrong-option analysis: Coal: classic fossil fuel, formed from ancient plant matter over millions of years; Natural gas: fossil fuel, primarily methane from ancient marine organisms; Petroleum: fossil fuel, formed from marine microorganisms under pressure.

Correct Answer: B. Gondwana coal

• **Gondwana coal** = India's most economically important coal, over 200 million years old, forming the bulk of Indian metallurgical-grade coal. • **Major coalfields** — Jharia and Raniganj (Damodar Valley), Talcher (Mahanadi), Singareni (Godavari) are all Gondwana coalfields; Gondwana coal has lower moisture and higher carbon than Tertiary coal. • 💡 Wrong-option analysis: Tertiary coal: younger coal formed 15–60 million years ago, includes lignite in Neyveli; Cannel coal: a type of bituminous coal with high volatile content, not the geological classification; Bituminous coal: a quality category, not a geological age classification like Gondwana.

Correct Answer: A. A turbine

• **Turbine** = the device that converts steam energy into mechanical rotation in a thermal power plant, which then drives the generator. • **Steam-turbine-generator chain** — high-pressure steam from burning coal rotates turbine blades → shaft turns generator → mechanical energy converts to electrical energy. • 💡 Wrong-option analysis: Battery packs: store electricity, don't generate it by rotating; Solar panels: convert sunlight to DC electricity directly without turbines; Windmills: use wind to rotate turbines, but thermal plants use steam not wind.

Correct Answer: D. Kudankulam

• **Kudankulam, Tamil Nadu** = India's largest nuclear power station, built with Russian collaboration using VVER pressurized water reactors. • **Russia (Rosatom)** — supplied the reactor technology; Kudankulam is India's biggest single-site nuclear plant and a key part of India's clean energy strategy. • 💡 Wrong-option analysis: Rawatbhata: built with Canadian collaboration (CANDU design), not Russian; Narora: in Uttar Pradesh, built with indigenous technology, no Russian link; Kakrapar: in Gujarat, Indian design, no Russian collaboration.

Correct Answer: B. Thermal power generation

• **Thermal power generation** = the primary use of Neyveli lignite; the low-grade but abundant coal fuels large thermal stations right at the mine site. • **NLC (Neyveli Lignite Corporation)** — a Navratna PSU that operates open-cast lignite mines and power plants, supplying electricity to South India. • 💡 Wrong-option analysis: Chemical exports: lignite has no viable export market due to low quality; Iron smelting: requires high-grade coking coal (bituminous), not lignite; Domestic cooking: lignite is industrial fuel, not used in household kitchens.

Correct Answer: D. Nuclear fusion

• **Nuclear fusion** = the process by which the Sun generates energy, fusing hydrogen nuclei into helium under extreme temperature and pressure. • **Fusion vs. fission** — the Sun uses fusion (joining atoms) while Earth's nuclear plants use fission (splitting atoms); scientists are working on fusion reactors for clean energy. • 💡 Wrong-option analysis: Chemical combustion: burning of fuels like wood or coal, releases chemical energy not nuclear; Geothermal heating: heat from Earth's interior, not from nuclear fusion; Nuclear fission: splitting heavy atoms like uranium, used in power plants but not what the Sun does.

Correct Answer: A. Coal

• **Coal** = India's most abundant fossil fuel, meeting about 55% of the country's total energy needs; India is the world's second-largest coal producer. • **Industrial backbone** — coal is essential for steel, cement, and thermal power sectors; the Jharia, Raniganj, and Singareni fields are among India's largest. • 💡 Wrong-option analysis: Uranium: scarce in India, used only for nuclear power which provides ~3% of electricity; Petroleum: India is heavily import-dependent, domestic production is limited; Natural gas: significant but far smaller reserves than coal in India.

Correct Answer: B. Methane

• **Methane (CH4)** = the primary component of natural gas, constituting 70–90% of its composition; highly flammable and energy-dense. • **Industrial uses** — natural gas is used for power generation, as fertilizer feedstock (urea plants), and for home cooking via CNG/PNG networks. • 💡 Wrong-option analysis: Butane: a component of LPG (liquefied petroleum gas), not the main component of natural gas; Ethane: present in small amounts in natural gas but not the primary component; Propane: also part of LPG mix, not the dominant component of natural gas.

Correct Answer: D. Rajasthan

• **Rajasthan** = the state where Rawatbhata Nuclear Power Station (Rajasthan Atomic Power Station) is located, near Chittorgarh. • **CANDU design** — uses heavy water as both moderator and coolant; established with Canadian collaboration; one of India's earliest nuclear plants. • 💡 Wrong-option analysis: Gujarat: has Kakrapar Atomic Power Station, not Rawatbhata; Uttar Pradesh: has Narora Atomic Power Station; Haryana: has no nuclear power plant, Rawatbhata is specifically in Rajasthan.

Correct Answer: A. Punjab

• **Punjab** = India's top state for agricultural biomass energy potential due to massive paddy and wheat crop residue generation. • **Stubble burning alternative** — Punjab's crop residue (especially paddy straw) can power biomass plants instead of being burnt in fields; biomass is carbon-neutral. • 💡 Wrong-option analysis: Kerala: known for plantation crops (rubber, coconut), smaller farm area, less biomass residue than Punjab; Himachal Pradesh: hilly terrain, limited flat farmland, small-scale agriculture; Nagaland: small NE state with limited large-scale agriculture and biomass potential.