🧱 KPSC JE Civil – Solved Questions (Part 5: Q81–Q100)

Below are questions 81 to 100 with the correct answer and explanation for every option.

📘 Q81. The specific gravity of cement is approximately?

• (1) 1.5 – Too low.
• (2) 2.2 – Not correct.
• (3) 3.15 – Correct (Standard value).
• (4) 4.0 – Too high.

📘 Q82. If flow velocity is less than critical velocity, the flow is?

• (1) Supercritical – Velocity > Critical.
• (2) Subcritical – Correct.
• (3) Critical – Equal to critical.
• (4) Turbulent – Not related.

📘 Q83. Which is a waterborne disease?

• (1) Malaria – Vector borne.
• (2) Typhoid – Correct.
• (3) Dengue – Mosquito-borne.
• (4) Plague – Rodent-borne.

📘 Q84. Standard Proctor test uses a hammer of?

• (1) 2.5 kg – Correct.
• (2) 4.5 kg – Heavy Proctor.
• (3) 1.5 kg – Incorrect.
• (4) 3.0 kg – Not used.

📘 Q85. The coefficient of discharge (Cd) of an orifice is?

• (1) 0 – No flow.
• (2) 1 – Theoretical only.
• (3) Between 0.6 to 0.7 – Correct.
• (4) 0.9 – Too high for an orifice.

📘 Q86. Damp-proof course (DPC) is provided to prevent?

• (1) Heat – No.
• (2) Sound – No.
• (3) Moisture rising by capillarity – Correct.
• (4) Termites – No.

📘 Q87. Most economical section of a channel is one where?

• (1) Hydraulic radius is maximum – Correct.
• (2) Area is maximum – Not alone.
• (3) Velocity is zero – Impossible.
• (4) Wetted perimeter is maximum – Opposite.

📘 Q88. Which soil property determines swelling & shrinkage?

• (1) Liquid limit – Related but not main.
• (2) Plasticity index – Correct.
• (3) Shrinkage limit – Lower limit only.
• (4) Specific gravity – Not related.

📘 Q89. A simply supported beam with UDL has maximum shear at?

• (1) Centre – Zero.
• (2) Supports – Correct.
• (3) Quarter span – No.
• (4) Varies randomly – No.

📘 Q90. Filter media in rapid sand filter mainly consists of?

• (1) Coarse gravel – Used as base layer.
• (2) Pebbles – Base layer.
• (3) Sand – Correct.
• (4) Clay – Not used.

📘 Q91. Most accurate levelling instrument?

• (1) Tilting level – Medium accuracy.
• (2) Dumpy level – Accurate.
• (3) Auto level – Correct. Highest accuracy.
• (4) Theodolite – Not used for leveling.

📘 Q92. Water hammer occurs due to?

• (1) Sudden opening/closing of valve – Correct.
• (2) Sudden pressure loss – No.
• (3) Leakage – No.
• (4) Cavitation – Different phenomenon.

📘 Q93. The instrument used for measuring horizontal angles?

• (1) Prismatic compass – Correct.
• (2) Dumpy level – No.
• (3) Clinometer – Measures slopes.
• (4) Autocollimator – Precision alignment.

📘 Q94. The maximum water–cement ratio for durability in RCC?

• (1) 0.55 – Correct (IS 456).
• (2) 0.65 – Too high.
• (3) 0.75 – Poor durability.
• (4) 0.90 – Very weak concrete.

📘 Q95. BOD is measured over?

• (1) 5 days at 20°C – Correct.
• (2) 1 day – Not standard.
• (3) 10 days – No.
• (4) 15 days – Not used.

📘 Q96. Grading of aggregates ensures?

• (1) Maximum voids – Opposite.
• (2) Minimum voids – Correct.
• (3) More cement consumption – Not desired.
• (4) Higher permeability – No.

📘 Q97. The best cement for marine environments?

• (1) PPC – Moderate.
• (2) OPC – Not suitable.
• (3) Sulphate resistant cement – Correct.
• (4) White cement – Not for marine.

📘 Q98. The speed at which traffic flow is maximum?

• (1) Free-flow speed – Low density.
• (2) Jam speed – No movement.
• (3) Optimum speed – Correct.
• (4) Mean speed – Not related.

📘 Q99. Maximum permissible turbidity in drinking water?

• (1) 1 NTU – Desirable.
• (2) 5 NTU – Correct (acceptable limit).
• (3) 10 NTU – Too high.
• (4) 20 NTU – Unsafe.

📘 Q100. Cement becomes unsound due to excess?

• (1) Lime – Correct. Excess lime causes expansion.
• (2) Silica – No effect.
• (3) Iron oxide – No.
• (4) Gypsum – Controls setting time.

✔ Part 6 (Q101–Q120) available on request.