SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Carbon & Its Compounds; Polymers & Fuels – Level 1 · Warm-up · Tier I Level – 12 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
The valency of carbon is:

Correct Answer: C [4]

Explanation:

Carbon (2, 4) shares four electrons – tetravalency.

2.  
The property of carbon atoms to link with one another to form long chains is called:

Correct Answer: B [catenation]

Explanation:

Catenation – chains, branches and rings.

3.  
Which allotrope of carbon is the hardest natural substance?

Correct Answer: A [Diamond]

Explanation:

Each carbon is bonded to four others in a rigid network.

4.  
The main constituent of CNG is:

Correct Answer: D [methane]

Explanation:

CNG = compressed natural gas, mainly methane.

5.  
Which fuel has the highest calorific value?

Correct Answer: D [Hydrogen]

Explanation:

Answer: Hydrogen. Hydrogen: 150000 kJ/kg.

6.  
The general formula of alkenes is:

Correct Answer: C [CₙH₂ₙ]

Explanation:

One double bond: two H fewer than the alkane.

7.  
Polythene is a polymer of:

Correct Answer: A [ethene]

Explanation:

Answer: ethene. Poly + ethene.

8.  
Melamine resin, used for unbreakable kitchenware, is:

Correct Answer: B [a thermosetting plastic]

Explanation:

Melamine (like Bakelite) sets once on heating and does not soften again – thermosetting.

9.  
Vinegar is a dilute solution of:

Correct Answer: D [ethanoic (acetic) acid]

Explanation:

Answer: ethanoic (acetic) acid. 5–8% ethanoic acid.

10.  
The hottest zone of a candle flame is the:

Correct Answer: C [outermost (blue) zone]

Explanation:

Complete combustion takes place in the outer zone.

11.  
Fill in the blankThe fire in electrical equipment is best put out with ___.

Correct Answer: B [carbon dioxide]

Explanation:

Water conducts electricity; CO₂ cuts off oxygen.

12.  
Diagram-basedName the hydrocarbon shown:

Correct Answer: A [Propene]

Explanation:

3 carbons, one C=C double bond, C₃H₆ → propene.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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