The setting of cement is an: MCQ with Answer and Explanation

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The setting of cement is an:

A. Endothermic process

B. Evaporation process

C. Exothermic process

D. Oxidation process

Answer: Option C

Solution (By JKSSB Mock Tests)

Hydration of cement is exothermic (heat of hydration). In large concrete pours, this heat can cause thermal cracking. Cooling is sometimes needed.

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Question #1

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The structure of diamond is:

A. Cubic close-packed

B. Tetrahedral network

C. Layered hexagonal

D. Linear chain

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Correct Answer: Option B

Explanation:
Each carbon in diamond is sp³ hybridized and covalently bonded to four others in a tetrahedral geometry, forming a rigid 3D network. Graphite has a layered structure.

This question belongs to: Science chemistry

Question #2

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The common name of sodium hydroxide is:

A. Baking soda

B. Caustic soda

C. Soda ash

D. Washing soda

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Correct Answer: Option B

Explanation:
NaOH is caustic soda. Washing soda is Na₂CO₃·10H₂O; baking soda NaHCO₃; soda ash anhydrous Na₂CO₃.

This question belongs to: Science chemistry

Question #3

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In the extraction of iron in a blast furnace, limestone is added to:

A. Increase carbon content

B. Lower the melting point of iron

C. Reduce iron oxide

D. Remove silica as slag

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Correct Answer: Option D

Explanation:
Limestone (CaCO₃) decomposes to CaO, which is a basic flux. It reacts with the acidic impurity silica (SiO₂) to form calcium silicate (CaSiO₃), a fusible slag: CaO + SiO₂ → CaSiO₃. Slag floats on molten iron and is tapped separately. Reduction is done by CO/coke. Flux makes gangue removal easier. Slag is used in cement, road building.

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