# Civil Engineering - UPSC Civil Service Exam Questions

6.

A clay layer 3 m deep is sandwiched by a pervious material. The soil reaches 90% consolidation in 3 years. At another site, the same clay layer is bounded by impervious boundary at the bottom and sand at the top. What is the time taken by this layer to reach 90% settlement ?

 A. 9 years B. 12 years C. 15 years D. 21 years

Explanation:

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7.

What is the distance through which the tongue rail moves laterally at the toe of the switch for movement of trains called ?

 A. Flangeway clearance B. Heel divergence C. Throw of the switch D. None of the above

Explanation:

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8.

Presence of which one of the following in water is the major cause of depression paralysis, blindness and/or birth defects ?

 A. cadmium B. Chromium C. Manganese D. Mercury

Explanation:

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9.

Consider a close-coiled helical spring of radius R, subjected to a load P. The spring consists of n turns of wire with wire radius r. The stiffness of the spring is

 A. B. C. D.

Explanation:

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10.

Force of buoyancy on a floating body equals

 A. total pressure on the vertical projection of the body B. total pressure on the horizontal projection of the body C. weight of the liquid equal to the volume of the body D. weight of the liquid equal to the immersed volume of the body