🧱 KPSC JE Civil – Solved Questions (Part 12: Q221–Q240)

This section contains questions 221 to 240 with full option-wise explanations.

📘 Q221. The minimum thickness of DPC (Damp Proof Course)?

• (1) 20 mm – Correct.
• (2) 50 mm – Too thick.
• (3) 10 mm – Too thin.
• (4) 5 mm – Not used.

📘 Q222. The drainage coefficient is expressed in?

• (1) mm/day – Correct.
• (2) m³/s – Discharge unit.
• (3) liters – No.
• (4) m² – Area.

📘 Q223. The best material for sound insulation?

• (1) Cork – Correct.
• (2) Stone – Reflects sound.
• (3) Steel – Reflects; not insulator.
• (4) Glass – Poor sound absorber.

📘 Q224. The hydraulic gradient line lies?

• (1) Always above EGL – No.
• (2) Always below EGL – Correct.
• (3) Always horizontal – No.
• (4) Always vertical – No.

📘 Q225. The minimum cover for footings (as per IS 456)?

• (1) 50 mm – Correct.
• (2) 20 mm – Too low.
• (3) 75 mm – Used in special cases.
• (4) 15 mm – No.

📘 Q226. A spillway that uses atmospheric pressure variation?

• (1) Siphon spillway – Correct.
• (2) Chute spillway – No.
• (3) Ogee spillway – No.
• (4) Side channel spillway – No.

📘 Q227. The purpose of check dams?

• (1) Reduce velocity of runoff – Correct.
• (2) Store irrigation water – No.
• (3) Divert water – No.
• (4) Hydropower generation – No.

📘 Q228. The unit of toughness (impact strength)?

• (1) Joules – Correct.
• (2) Newton – Force.
• (3) Pascal – Pressure.
• (4) Watt – Power.

📘 Q229. CBR test is primarily used for?

• (1) Pavement design – Correct.
• (2) Concrete strength – No.
• (3) Soil compaction – Different test.
• (4) Water absorption – No.

📘 Q230. A spillway designed for excess flood discharge?

• (1) Emergency spillway – Correct.
• (2) Chute spillway – General use.
• (3) Siphon spillway – Automatic operation.
• (4) Ogee spillway – Normal operation.

📘 Q231. The instrument used to find depth of water?

• (1) Echo sounder – Correct.
• (2) Piezometer – Hydraulic head.
• (3) Thermometer – Temperature.
• (4) Barometer – Pressure.

📘 Q232. The most suitable soil for backfill behind retaining walls?

• (1) Coarse-grained soil – Correct. Good drainage.
• (2) Clay – Very poor drainage.
• (3) Peat – Highly compressible.
• (4) Organic soil – Unstable.

📘 Q233. The minimum thickness of brick wall using modular bricks?

• (1) 100 mm (½ brick) – Correct.
• (2) 50 mm – No.
• (3) 200 mm – Full brick wall.
• (4) 300 mm – Thick wall.

📘 Q234. A prism is used in surveying for?

• (1) Reflecting EDM signal – Correct.
• (2) Measuring angles – Theodolite.
• (3) Leveling – Dumpy level.
• (4) Mapping – No.

📘 Q235. Transmission of load through floor slab to beams?

• (1) Two-way action – Correct.
• (2) One-way action – Only in one direction.
• (3) Direct bearing – No.
• (4) Buckling action – No.

📘 Q236. The term “hydrograph” represents?

• (1) Discharge vs time – Correct.
• (2) Rainfall vs area – Isohyet.
• (3) Depth vs duration – IDF.
• (4) Soil moisture vs depth – No.

📘 Q237. Thickness of plaster for interior walls?

• (1) 12 mm – Correct.
• (2) 6 mm – Too thin.
• (3) 25 mm – External / special cases.
• (4) 30 mm – No.

📘 Q238. The process of removing silt from canals?

• (1) Desilting – Correct.
• (2) Dredging – For rivers/ports.
• (3) Scouring – Natural erosion.
• (4) Flocculation – Water treatment.

📘 Q239. The water required to fill pores of soil?

• (1) Saturation water content – Correct.
• (2) Field capacity – Agriculture term.
• (3) Plastic limit – Consistency.
• (4) Specific yield – Groundwater.

📘 Q240. A retaining wall fails mainly due to?

• (1) Overturning – Correct.
• (2) Torsion – No.
• (3) Shear only – Partial cause.
• (4) Expansion – No.

✔ Part 13 (Q241–Q260) is ready.