Coal & Petroleum MCQ | Class 8 Science Ch 3 Quiz

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Class 8 Science Chapter 3 Objective Questions

This online MCQ test for Class 8 Science Chapter 3 (Coal and Petroleum) helps assess preparation and revise exam-relevant concepts. It covers formation of fossil fuels, fractional distillation, properties and uses of fractions, conservation, and environmental impacts.

In this test, the objective questions relate to:

• Coal: formation, carbonization, coke, coal tar, coal gas
• Petroleum: crude oil, refining, boiling point fractions, uses
• Natural gas: composition, CNG/LPG uses and safety
• Conservation: efficient usage and alternative practices
• Environment: pollutants, acid rain, greenhouse gases

Answer all 25 questions and review the score at the end to analyze preparation. Good luck!

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Coal and petroleum are classified as which type of natural resources?

Inexhaustible Exhaustible Renewable Perennial

They are limited in quantity and can be depleted by human use.

Which substance is almost pure carbon obtained from coal?

Coal tar Coke Coal gas Bitumen

Coke is a porous, high-carbon solid derived from coal and used as a reducing agent.

The process that formed coal from ancient plant remains is called:

Carbonization Distillation Polymerization Calcination

Over millions of years, heat and pressure converted plant matter into coal in a process called carbonization.

What is the primary source of petroleum formation?

Volcanic lava Dead marine organisms Desert sand Glacial ice

Petroleum formed from the buried remains of microscopic marine life under heat and pressure.

Crude oil is separated into useful components mainly by:

Chromatography Fractional distillation Filtration Crystallization

Crude oil fractions are separated based on different boiling point ranges in a fractionating column.

Which fraction of petroleum is used as fuel in jet aircraft?

Petrol (gasoline) Diesel Kerosene Lubricating oil

Aviation turbine fuel is a kerosene-range fraction suited for jet engines.

Natural gas is chiefly composed of:

Ethane Methane Propane Butane

Methane is the main component of natural gas, often above 80%.

Which of the following is commonly used as a domestic fuel in compressed form?

Coke CNG Coal tar Coal gas

Compressed Natural Gas is used for domestic and vehicular fuel due to clean combustion.

Which petroleum fraction is used for road surfacing?

Naphtha Bitumen Kerosene LPG

Bitumen (asphalt) is a heavy residue used in road construction and roofing.

Which statement about LPG is correct?

It is mainly carbon monoxide It is a mixture of propane and butane It is solid at room temperature It is the same as CNG

Liquefied Petroleum Gas typically contains propane and butane stored under pressure.

Which of the following is NOT a product obtained from coal?

Coke Coal tar Coal gas Diesel

Diesel is obtained from petroleum refining, not directly from coal.

Coal tar is best described as:

A pure hydrocarbon A complex mixture of substances Inorganic mineral Gaseous fuel

Coal tar contains many aromatic compounds used as chemical feedstock.

Which fuel is considered the least polluting among common vehicle fuels?

Diesel Petrol CNG Kerosene

CNG burns more cleanly, emitting fewer particulates and harmful gases.

A major drawback of fossil fuels is that they:

Are inexpensive to extract Are inexhaustible Cause environmental pollution Cannot produce energy

Burning fossil fuels releases greenhouse gases and pollutants.

The term ‘petroleum’ literally means:

Rock oil Ancient energy Sea fuel Plant oil

From Latin: ‘petra’ (rock) and ‘oleum’ (oil), indicating oil obtained from rocks.

Which practice directly supports conservation of petroleum?

Driving at high speeds Carpooling and public transport Idling engines for long periods Using underinflated tires

Efficient transport choices reduce fuel consumption and conserve resources.

Which equipment is used in refineries to separate crude oil fractions?

Rotary kiln Fractionating column Electrolytic cell Blast furnace

It provides temperature gradients and trays for vapor–liquid separation by boiling points.

Coke is preferred in metallurgy because it:

Is liquid at room temperature Is a strong reducing agent and burns with little smoke Contains high moisture Is highly explosive

Its high carbon content and low impurities make it suitable for extracting metals.

Which gas is often found above petroleum deposits and is commercially valuable?

Ozone Natural gas Carbon dioxide Hydrogen

Natural gas caps can be trapped above petroleum reservoirs due to density differences.

Which is NOT a correct pairing of petroleum fraction and use?

Petrol – motor fuel Diesel – heavy vehicles Lubricating oil – road surfacing Paraffin wax – candles

Road surfacing uses bitumen; lubricating oil reduces friction in machinery.

An efficient household practice to conserve LPG is to:

Use oversized burners Cook with lids on pots Keep flames high always Use leaking hoses

Covering pots reduces heat loss and fuel consumption.

Fossil fuels are termed ‘non-renewable’ because they:

Cannot be burned Regenerate faster than use Form over geological timescales Are abundant everywhere

Their formation takes millions of years, far longer than the rate of consumption.

Which of the following is primarily obtained through destructive distillation of coal?

Kerosene Coal gas Petrol Natural gas

Heating coal in absence of air yields coke, coal tar, and coal gas.

Which statement about petroleum refining is true?

All fractions have the same boiling point Lighter fractions condense at higher trays Heavier fractions condense lower in the column Crude oil is used directly without processing

Temperature is highest at the bottom; high-boiling components condense lower down.

A key environmental impact of burning coal is the emission of:

Nitrogen only Oxygen Sulfur dioxide and carbon dioxide Helium

Coal combustion releases SO₂ causing acid rain and CO₂ contributing to global warming.

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