Petroleum & natural gas — Class 8 CBSE Science MCQs with Solutions
Free Class 8 CBSE Science Petroleum & natural gas MCQs with step-by-step solutions (24 questions). Part of Coal and Petroleum. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Petroleum & natural gas · easy · theory
Petrol is used as a fuel mainly in which type of vehicles?
A. Light automobiles such as motorcycles, scooters and cars ✓ Correct
B. Heavy vehicles such as trucks and tractors
C. Railway steam engines
D. Thermal power plants
Solution: Petrol, obtained from petroleum, is the fuel used in light automobiles like motorcycles, scooters and cars.
Q2 — Petroleum & natural gas · easy · theory
The word 'petroleum' is made from two words meaning:
A. Rock and oil ✓ Correct
B. Sea and oil
C. Fire and stone
D. Gas and water
Solution: 'Petroleum' comes from petra (rock) and oleum (oil), because it is mined from between the rocks under the Earth.
Q3 — Petroleum & natural gas · easy · theory
Diesel is commonly used as a fuel in:
A. Heavy motor vehicles such as trucks and tractors ✓ Correct
B. Motorcycles and scooters
C. Kerosene lamps
D. Home cooking stoves
Solution: Diesel, obtained from petroleum, is the fuel used to run heavy vehicles such as trucks and tractors.
Q4 — Petroleum & natural gas · easy · theory
Because of its great commercial importance, petroleum is often called:
A. Black gold ✓ Correct
B. Black diamond
C. Blue fuel
D. White gold
Solution: Due to its great commercial value, petroleum is popularly known as 'black gold'.
Q5 — Petroleum & natural gas · easy · theory
CNG stands for:
A. Compressed Natural Gas ✓ Correct
B. Coal Natural Gas
C. Compressed Nitrogen Gas
D. Cooking Natural Gas
Solution: Natural gas stored under high pressure is called Compressed Natural Gas (CNG).
Q6 — Petroleum & natural gas · easy · theory
The process of separating the various constituents of petroleum is called:
A. Refining ✓ Correct
B. Carbonisation
C. Compression
D. Extraction
Solution: Refining is the process of separating the various fractions of petroleum, carried out in a petroleum refinery.
Q7 — Petroleum & natural gas · easy · theory
Kerosene obtained from petroleum is used as a fuel for:
A. Stoves, lamps and jet aircraft ✓ Correct
B. Heavy trucks and tractors
C. Making candles and vaseline
D. Surfacing roads
Solution: Kerosene is used as fuel for stoves, lamps and for jet aircraft.
Q8 — Petroleum & natural gas · easy · theory
Petroleum gas in liquid form (LPG) is mainly used as:
A. A fuel for home and industry ✓ Correct
B. A lubricant for machines
C. A solvent for dry cleaning
D. A material for road surfacing
Solution: LPG (liquefied petroleum gas) is used as a fuel in homes and industry.
Q9 — Petroleum & natural gas · easy · theory
Paraffin wax, a constituent of petroleum, is used to make:
A. Ointments, candles and vaseline ✓ Correct
B. Synthetic dyes and explosives
C. Fertilisers and detergents
D. Steel and metals
Solution: Paraffin wax is used to make ointments, candles and vaseline.
Q10 — Petroleum & natural gas · easy · theory
Which of these best describes petroleum?
A. A dark, oily liquid with an unpleasant odour and a mixture of many constituents ✓ Correct
B. A hard, black solid as hard as stone
C. A colourless, odourless gas
D. A pure single substance, not a mixture
Solution: Petroleum is a dark, oily liquid with an unpleasant odour and is a mixture of constituents like petrol, diesel and lubricating oil.
Q11 — Petroleum & natural gas · easy · theory
In India, petroleum (oil) is found in which of the following places?
A. Assam, Gujarat and Mumbai High ✓ Correct
B. Tripura and Rajasthan only
C. Pennsylvania and Makum
D. Vadodara and Delhi pipelines
Solution: In India, oil is found in Assam, Gujarat, Mumbai High, and the river basins of Godavari and Krishna.
Q12 — Petroleum & natural gas · easy · theory
Petroleum was formed from the dead remains of organisms that lived in the:
A. Sea ✓ Correct
B. Dense forests on land
C. Low-lying wetlands
D. Deep mines
Solution: Petroleum was formed from organisms living in the sea whose dead bodies settled at the sea bottom and were transformed over millions of years.
Q13 — Petroleum & natural gas · medium · theory
In an underground petroleum deposit, which layer lies at the very top?
A. Natural gas ✓ Correct
B. Oil
C. Water
D. Sand and clay
Solution: Gas is lighter than oil and water, so in a deposit the order from top to bottom is gas, then oil, then water.
Q14 — Petroleum & natural gas · medium · theory
Oil and gas float above the water in a petroleum deposit because they:
A. Are lighter than water and do not mix with it ✓ Correct
B. Are heavier than water
C. Dissolve completely in water
D. Are formed after the water layer
Solution: Oil and gas are lighter than water and do not mix with it, so they settle above the water layer.
Q15 — Petroleum & natural gas · medium · theory
A truck driver and a scooter driver stop at a fuel station. Which fuels do their vehicles most likely need?
A. Truck needs diesel; scooter needs petrol ✓ Correct
B. Truck needs petrol; scooter needs diesel
C. Both need kerosene
D. Both need LPG
Solution: Diesel is used in heavy vehicles like trucks, while petrol is used in light automobiles like scooters.
Q16 — Petroleum & natural gas · medium · theory
CNG is preferred as a transport fuel over petrol and diesel mainly because it is:
A. Less polluting, a cleaner fuel ✓ Correct
B. Cheaper to mine directly from rocks
C. A pure form of carbon like coke
D. A renewable fuel that never runs out
Solution: CNG is used for power generation and transport because it is less polluting, making it a cleaner fuel.
Q17 — Petroleum & natural gas · medium · theory
Hydrogen gas obtained from natural gas is used to make:
A. Fertilisers such as urea ✓ Correct
B. Candles and vaseline
C. Steel and coke
D. Naphthalene balls
Solution: Hydrogen gas obtained from natural gas is used to make fertilisers such as urea.
Q18 — Petroleum & natural gas · medium · theory
Petrochemicals obtained from petroleum and natural gas are used to manufacture:
A. Detergents and man-made fibres like polyester and nylon ✓ Correct
B. Steel and the extraction of metals
C. Coke and coal gas
D. Synthetic dyes from coal tar
Solution: Petrochemicals are used to manufacture detergents, fibres like polyester and nylon, polythene and other plastics.
Q19 — Petroleum & natural gas · medium · theory
Which petroleum product is now used instead of coal tar for surfacing roads?
A. Bitumen ✓ Correct
B. Kerosene
C. Lubricating oil
D. Paraffin wax
Solution: Bitumen, a petroleum product, is nowadays used in place of coal tar for road surfacing and in paints.
Q20 — Petroleum & natural gas · medium · theory
Why can the many constituents of petroleum be separated by refining?
A. Petroleum is a mixture of different substances, so its fractions can be separated ✓ Correct
B. Petroleum is a single pure substance that breaks down
C. Petroleum turns into carbon when heated
D. Petroleum is lighter than water
Solution: Petroleum is a mixture of constituents such as petrol, diesel and lubricating oil, so refining separates these fractions in a refinery.
Q21 — Petroleum & natural gas · medium · theory
Which set of conditions transformed dead sea organisms into petroleum and natural gas?
A. Absence of air, high temperature and high pressure ✓ Correct
B. Plenty of air, low temperature and low pressure
C. Bright sunlight and running water
D. Presence of oxygen and cool conditions
Solution: Over millions of years, the absence of air together with high temperature and high pressure changed dead sea organisms into petroleum and natural gas.
Q22 — Petroleum & natural gas · medium · theory
Natural gas is considered a very important fossil fuel mainly because it:
A. Is easy to transport through pipes ✓ Correct
B. Is as hard as stone
C. Is a pure form of carbon
D. Is heavier than water in deposits
Solution: Natural gas is a very important fossil fuel because it is easy to transport through pipes.
Q23 — Petroleum & natural gas · medium · theory
Which petroleum constituent is used as a solvent for dry cleaning?
A. Petrol ✓ Correct
B. Diesel
C. Lubricating oil
D. Bitumen
Solution: Besides being a motor and aviation fuel, petrol is also used as a solvent for dry cleaning.
Q24 — Petroleum & natural gas · medium · theory
In India, natural gas reserves are found in which of the following?
A. Tripura, Rajasthan and Maharashtra ✓ Correct
B. Assam, Gujarat and Mumbai High
C. Pennsylvania and Makum
D. Vadodara and parts of Delhi only
Solution: India has vast natural gas reserves in Tripura, Rajasthan, Maharashtra and the Krishna-Godavari delta. Assam, Gujarat and Mumbai High are known for oil, while Vadodara and Delhi only have CNG pipeline networks.