UPSC Civil Engineering PYQs 2023 | Vaidra

1Medium10 marks

Explain the significance of the following from the point of view of water quality criteria :

(i) Nitrites

(ii) Nitrates

(iii) E-coli

(iv) B.O.D.

(v) Dissolved oxygen

2Mediummains

Civil Engineering

A strip footing of width 2.8 m as shown in the figure is founded at a depth of 2.5 m below the ground surface in a C – φ soil. Water table is at a depth of 6 m below the ground surface. The average moist weight of soil above the water table is 18 kN/m³. Determine the ultimate bearing capacity, net ultimate bearing capacity, net allowable bearing pressure and the load per metre for a factor of safety of 2.5. Use the general shear failure theory of Terzaghi.

Given : For φ = 30°, N_c = 37.2, N_q = 22.5, N_γ = 19.7

What will be the percent decrease in ultimate bearing capacity if, during flooding, the water level rises 2 m above ground surface?

3Medium20 marks

A machine was purchased for ₹ 4,50,000 on 1st January 2001 and erection and installation work costed ₹ 80,000. The same machine is replaced by a new one on 31st December 2020. If the scrap value was estimated at ₹ 1,50,000

(i) What should be the rate of depreciation fund on 15th June 2010 ?

(ii) If after 12 years of running, some assemblies are replaced and the replacement cost is ₹ 1,50,000, what will be the new rate of depreciation ?

Civil Engineering UPSC PYQ 2023

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