📘 KPSC JE Civil – Solved Questions (Part 15: Q281–Q300)

Below are questions 281 to 300 with full option-wise explanations.

📘 Q281. What is the main function of baffle walls in sedimentation tanks?

• (1) To dissipate energy – Correct, prevents short-circuiting.
• (2) To increase temperature – No use.
• (3) To increase sludge volume – No.
• (4) To create turbulence – Opposite of purpose.

📘 Q282. The water surface profile in gradually varied flow is governed by?

• (1) Differential equation of GVF – Correct.
• (2) Manning’s equation – Friction only.
• (3) Hazen-Williams – For pipes.
• (4) Darcy-Weisbach – Pipe losses.

📘 Q283. The main purpose of curing concrete?

• (1) Maintain moisture – Correct.
• (2) Increase temperature – No.
• (3) Reduce cement – No.
• (4) Reduce slump – No.

📘 Q284. Specific gravity of soil solids generally lies between?

• (1) 2.60–2.80 – Correct.
• (2) 0.9–1.1 – For liquids.
• (3) 1.5–2.0 – No.
• (4) 3.5–4.0 – Very high.

📘 Q285. An aquifer bounded above and below by impervious layers?

• (1) Confined aquifer – Correct.
• (2) Unconfined aquifer – No top boundary.
• (3) Perched aquifer – Localised.
• (4) Water table – Not an aquifer type.

📘 Q286. Stiff consistency of concrete indicates?

• (1) Low slump – Correct.
• (2) High slump – Fluid concrete.
• (3) No slump – Very harsh mix.
• (4) Zero air content – Not related.

📘 Q287. The method used to determine moisture content of soil?

• (1) Oven drying method – Correct.
• (2) Pycnometer – For specific gravity.
• (3) Hydrometer – For particle size.
• (4) Vicat apparatus – Cement testing.

📘 Q288. The device used to measure the velocity of flowing water?

• (1) Pitot tube – Correct.
• (2) Piezometer – Pressure head.
• (3) Manometer – Pressure difference.
• (4) Rain gauge – Rainfall.

📘 Q289. The ratio of voids to solids in soil?

• (1) Void ratio – Correct.
• (2) Porosity – Voids/total volume.
• (3) Degree of saturation – Water-filled voids.
• (4) Water content – Not ratio.

📘 Q290. The air content in well-compacted concrete is?

• (1) 1–2% – Correct.
• (2) 5–8% – For air-entrained concrete.
• (3) 10–15% – Unacceptable.
• (4) 15–20% – Impossible.

📘 Q291. The depth of neutral axis in RCC beam depends on?

• (1) Grade of concrete – Correct (affects stress block).
• (2) Diameter of bars – Only indirectly.
• (3) Weight of beam – No effect.
• (4) Length of beam – No.

📘 Q292. The irrigation method best suited for rice?

• (1) Flooding – Correct.
• (2) Furrow – Not suitable.
• (3) Sprinkler – No.
• (4) Drip – No.

📘 Q293. The safest type of retaining wall?

• (1) Cantilever – Common.
• (2) Counterfort – Correct (economical and stable for height).
• (3) Gravity – Massive.
• (4) Brick retaining wall – Weak.

📘 Q294. Darcy’s law is applicable when?

• (1) Flow is laminar – Correct.
• (2) Flow is turbulent – Not applicable.
• (3) Flow is compressible – No.
• (4) Velocity is high – Not allowed.

📘 Q295. The compaction curve is plotted between?

• (1) Water content & dry density – Correct.
• (2) Void ratio & water content – No.
• (3) Porosity & density – No.
• (4) Water content & saturation – No.

📘 Q296. The most economical cross-drainage work?

• (1) Aqueduct – Expensive.
• (2) Super-passage – Costly.
• (3) Culvert – Correct.
• (4) Syphon – Complex.

📘 Q297. The best method to reduce evaporation losses?

• (1) Floating covers – Correct.
• (2) Increasing surface area – Increases evaporation.
• (3) Deepening reservoirs – Moderate effect.
• (4) Stirring water – Increases evaporation.

📘 Q298. The suitable mix for plastering?

• (1) 1:6 – Correct.
• (2) 1:2 – Too rich.
• (3) 1:10 – Too lean.
• (4) 1:20 – Weak.

📘 Q299. The main pollutant causing acid rain?

• (1) SO₂ – Correct.
• (2) CO – Poisonous gas.
• (3) CH₄ – Greenhouse gas.
• (4) O₃ – Not cause.

📘 Q300. The minimum thickness of rigid pavement?

• (1) 150 mm – Too thin.
• (2) 200 mm – Correct.
• (3) 400 mm – For heavy loads.
• (4) 100 mm – Not used.

✔ All remaining questions completed.