🧱 KPSC JE Civil – Solved Questions (Part 7: Q121–Q140)

This part contains questions 121 to 140 with correct answers and explanations for every option.

📘 Q121. Which IS code deals with plain and reinforced concrete?

• (1) IS 383 – Aggregates.
• (2) IS 456 – Correct. Design + construction of RCC.
• (3) IS 10262 – Mix design.
• (4) IS 516 – Strength tests.

📘 Q122. In levelling, back sight (BS) is taken on?

• (1) Benchmark – Correct.
• (2) Fore sight point – No.
• (3) Turning point – FS is taken.
• (4) Any point – No.

📘 Q123. Most suitable soil for embankment construction?

• (1) Sand – OK but not best.
• (2) Gravel – Correct. Best stability.
• (3) Peat – Very poor.
• (4) Black cotton soil – Highly expansive.

📘 Q124. The minimum cover for RCC slab?

• (1) 5 mm – Too low.
• (2) 15 mm – Correct.
• (3) 25 mm – Used for beams.
• (4) 40 mm – Used for footings.

📘 Q125. The Map scale 1:1000 means?

• (1) 1 cm = 1 km – Wrong.
• (2) 1 cm = 1000 m – Wrong.
• (3) 1 cm = 10 m – Correct.
• (4) 1 cm = 1 m – Incorrect.

📘 Q126. The most stable cross–section for channels is?

• (1) Rectangular – Not most stable.
• (2) Trapezoidal – Correct.
• (3) Circular – Used in pipes.
• (4) Square – No.

📘 Q127. The pH of drinking water should be?

• (1) 3–5 – Highly acidic.
• (2) 5–6 – Not acceptable.
• (3) 6.5–8.5 – Correct.
• (4) 10–12 – Highly alkaline.

📘 Q128. The principle of surveying is?

• (1) Working from whole to part – Correct.
• (2) Part to whole – Leads to errors.
• (3) Random order – No.
• (4) Based on experience – Not principle.

📘 Q129. The type of joint used to allow expansion in concrete?

• (1) Construction joint – Between pours.
• (2) Expansion joint – Correct.
• (3) Control joint – For cracks.
• (4) Contraction joint – Opposite effect.

📘 Q130. BOD indicates?

• (1) Amount of dissolved oxygen – No.
• (2) Organic matter in water – Correct.
• (3) Suspended solids – No.
• (4) Coliform bacteria – Measured separately.

📘 Q131. A structure that drains surface water from roads?

• (1) Catch basin – Correct.
• (2) Culvert – Cross drainage.
• (3) Manhole – Sewer access.
• (4) Headwall – Drain outlet support.

📘 Q132. Standard gauge for Indian Railways?

• (1) 1.676 m – Correct (Broad gauge).
• (2) 1.435 m – Standard international.
• (3) 1.000 m – Metre gauge.
• (4) 0.762 m – Narrow gauge.

📘 Q133. Permeability depends on?

• (1) Grain size – Yes.
• (2) Void ratio – Yes.
• (3) Degree of saturation – Yes.
• (4) All of the above – Correct.

📘 Q134. The maximum density in traffic flow occurs at?

• (1) Jam condition – Correct.
• (2) Free flow – Density low.
• (3) Optimum flow – Mid range density.
• (4) Parking – Not flow.

📘 Q135. A water meter measures?

• (1) Velocity – No.
• (2) Pressure – No.
• (3) Discharge/flow rate – Correct.
• (4) Turbidity – No.

📘 Q136. Slump value for pumpable concrete?

• (1) 0–25 mm – Low workability.
• (2) 50–75 mm – Moderate.
• (3) 75–125 mm – Correct.
• (4) 150–200 mm – Too high unless SCC.

📘 Q137. The primary treatment in wastewater removes?

• (1) Dissolved impurities – Secondary/tertiary.
• (2) Suspended solids – Correct.
• (3) Pathogens – Chlorination.
• (4) Nutrients – No.

📘 Q138. In a cantilever retaining wall, tension occurs at?

• (1) Base heel – Correct.
• (2) Base toe – Compression.
• (3) Stem top – Not max.
• (4) Middle of stem – No.

📘 Q139. The hardness in water is mainly due to?

• (1) Calcium & magnesium salts – Correct.
• (2) Sodium – No.
• (3) Iron – Causes staining.
• (4) Chloride – No.

📘 Q140. The rise and fall method of leveling requires?

• (1) Only BS readings – No.
• (2) Only FS readings – No.
• (3) BS, IS & FS – Correct.
• (4) No readings – Not possible.

✔ Part 8 (Q141–Q160) available on request.