🛢️ Coal and Petroleum – MCQs for Class 8 Science

Part 4: Q76 – Q100

Q76. Which by-product of coal is used in the steel industry as a reducing agent?

A) Coal gas
B) Coal tar
C) Coke
D) Bitumen

✅ Correct Answer: C) Coke

Explanation:

• A) Coal gas – Used as fuel.
• B) Coal tar – Source of chemicals.
• C) Coke – ✔ Almost pure carbon, reducing agent in steel.
• D) Bitumen – Petroleum product, road surfacing.

Q77. Which of these is used as a feedstock in chemical industries?

A) Petrol
B) Diesel
C) Naphtha
D) Bitumen

✅ Correct Answer: C) Naphtha

Explanation:

• A, B – Fuels.
• C) Naphtha – ✔ Used in petrochemicals to make plastics, detergents, etc.
• D) Bitumen – Road construction.

Q78. Which gas is mainly responsible for global warming from fossil fuel burning?

A) Nitrogen
B) Carbon dioxide
C) Oxygen
D) Argon

✅ Correct Answer: B) Carbon dioxide

Explanation:

• A, C, D – Not greenhouse gases.
• B) CO₂ – ✔ Main greenhouse gas.

Q79. Which of the following fuels is renewable?

A) Coal
B) CNG
C) Petroleum
D) None of these

✅ Correct Answer: D) None of these

Explanation:

• A, B, C – Fossil fuels, non-renewable.
• D) None – ✔ Correct answer.

Q80. Which by-product of petroleum is used to make Vaseline?

A) Wax
B) Bitumen
C) Diesel
D) Petrol

✅ Correct Answer: A) Wax

Explanation:

• A) Wax – ✔ Used in Vaseline, ointments, candles.
• B, C, D – Not used in ointments.

Q81. Which of these is a characteristic of natural gas?

A) Colourless
B) Odourless in pure form
C) Clean burning
D) All of these

✅ Correct Answer: D) All of these

Explanation:

• A, B, C – All properties of natural gas.
• D) All of these – ✔ Correct.

Q82. Which petroleum product is used in making shoe polish?

A) Bitumen
B) Wax
C) Petrol
D) Diesel

✅ Correct Answer: B) Wax

Explanation:

• A) Bitumen – Roads.
• B) Wax – ✔ Used in polish, ointments.
• C, D – Vehicle fuels.

Q83. Which gas is added to LPG cylinders to detect leakage?

A) Oxygen
B) Ethyl mercaptan
C) Methane
D) Carbon monoxide

✅ Correct Answer: B) Ethyl mercaptan

Explanation:

• A, C, D – Not added.
• B) Ethyl mercaptan – ✔ Strong smell, detects leakage.

Q84. What is the chief use of bitumen?

A) Road surfacing
B) Domestic fuel
C) Jet fuel
D) Cooking

✅ Correct Answer: A) Road surfacing

Explanation:

• A) ✔ Bitumen is sticky, waterproof, used for roads.
• B, C, D – Not correct.

Q85. Which form of coal is youngest and has least carbon content?

A) Anthracite
B) Lignite
C) Bituminous
D) Peat

✅ Correct Answer: D) Peat

Explanation:

• A, B, C – Higher carbon.
• D) Peat – ✔ Least carbon, high moisture.

Q86. Which fossil fuel is mainly used in thermal power stations?

A) Coal
B) Diesel
C) Petrol
D) Natural gas

✅ Correct Answer: A) Coal

Explanation:

• A) Coal – ✔ Major source for thermal electricity.
• B, C, D – Used in other industries.

Q87. Which by-product of coal is used in mothballs?

A) Coal gas
B) Coke
C) Coal tar
D) Naphtha

✅ Correct Answer: C) Coal tar

Explanation:

• C) Coal tar – ✔ Source of naphthalene → mothballs.
• A, B, D – Not used.

Q88. Which is the correct sequence of petroleum refining products (lightest to heaviest)?

A) Petrol → Diesel → Kerosene → Bitumen
B) Petrol → Kerosene → Diesel → Bitumen
C) Petrol → Diesel → Bitumen → Kerosene
D) Petrol → Bitumen → Diesel → Kerosene

✅ Correct Answer: B) Petrol → Kerosene → Diesel → Bitumen

Explanation:

• ✔ Based on boiling points: light → heavy fractions.

Q89. Which gas is poisonous and binds with haemoglobin in humans?

A) CO₂
B) CO
C) SO₂
D) NO₂

✅ Correct Answer: B) CO

Explanation:

• A) CO₂ – Greenhouse gas, less toxic.
• B) CO – ✔ Deadly, prevents oxygen transport.
• C, D – Irritant gases.

Q90. Which is NOT a use of petroleum products?

A) Making medicines
B) Making plastics
C) Making electricity directly
D) Making wax

✅ Correct Answer: C) Making electricity directly

Explanation:

• A, B, D – Correct uses.
• C) ✔ Petroleum not used directly for electricity generation.

Q91. Which of these is known as “liquid gold”?

A) Petrol
B) Diesel
C) Petroleum
D) Kerosene

✅ Correct Answer: C) Petroleum

Explanation:

• A, B, D – Fractions of petroleum.
• C) Petroleum – ✔ Valuable → “liquid gold.”

Q92. Which by-product of petroleum is used for making detergents?

A) Wax
B) Naphtha
C) Petrol
D) Bitumen

✅ Correct Answer: B) Naphtha

Explanation:

• A, C, D – Not used for detergents.
• B) Naphtha – ✔ Raw material for detergents and chemicals.

Q93. Which resource is called “buried sunshine”?

A) Coal
B) Petroleum
C) Natural gas
D) Wax

✅ Correct Answer: A) Coal

Explanation:

• A) Coal – ✔ Made from plants that trapped sunlight energy millions of years ago.
• B, C, D – Not given this name.

Q94. Which is the most abundant fossil fuel in the world?

A) Coal
B) Petroleum
C) Natural gas
D) LPG

✅ Correct Answer: A) Coal

Explanation:

• A) Coal – ✔ Widely available fossil fuel.
• B, C, D – Less abundant.

Q95. Which petroleum product is used in dry cleaning?

A) Petrol
B) Diesel
C) Naphtha
D) Bitumen

✅ Correct Answer: C) Naphtha

Explanation:

• A, B, D – Not correct.
• C) ✔ Solvent in dry cleaning.

Q96. Which is the heaviest fraction of petroleum?

A) Diesel
B) Petrol
C) Kerosene
D) Bitumen

✅ Correct Answer: D) Bitumen

Explanation:

• A, B, C – Lighter fractions.
• D) Bitumen – ✔ Heaviest residue.

Q97. Which fuel is supplied to homes through pipelines in cities?

A) LPG
B) CNG
C) PNG
D) Coal gas

✅ Correct Answer: C) PNG

Explanation:

• A) LPG – In cylinders.
• B) CNG – Vehicles.
• C) PNG – ✔ Piped Natural Gas for homes.
• D) Coal gas – Not used now.

Q98. Which of the following is NOT a disadvantage of petroleum?

A) Causes pollution
B) Limited reserves
C) Renewable resource
D) Causes oil spills

✅ Correct Answer: C) Renewable resource

Explanation:

• A, B, D – Real disadvantages.
• C) Renewable – ✔ False, it’s non-renewable.

Q99. Which country in Asia had the first oil well drilled?

A) Saudi Arabia
B) India
C) Iran
D) China

✅ Correct Answer: B) India

Explanation:

• A, C, D – Did not have Asia’s first oil well.
• B) India – ✔ Digboi (Assam).

Q100. Which fossil fuel produces the maximum energy per unit mass?

A) Coal
B) Petroleum
C) Natural gas
D) LPG

✅ Correct Answer: B) Petroleum

Explanation:

• A) Coal – Energy rich but less efficient.
• B) Petroleum – ✔ High calorific value, max energy.
• C, D – High efficiency, but petroleum is higher per mass.

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