GATE Civil Engineering (CE) Previous Year Question Paper 2015

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## GATE Civil Engineering (CE) Question Papers 2015

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1. Workability of concrete can be measured using slump, compaction factor and Vebe time. Consider the following statements for workability of concrete:

(i) As the slump increases, the Vebe time increases
(ii) As the slump increases, the compaction factor increases

Which of the following is TRUE?

• (A) Both (i) and (ii) are True
• (B) Both (i) and (ii) are False
• (C) (i) is True and (ii) is False
• (D) (i) is False and (ii) is True

2. Consider the following statements for air-entrained concrete:

(i) Air-entrainment reduces the water demand for a given level of workability
(ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expected

Which of the following is TRUE?

• (A) Both (i) and (ii) are True
• (B) Both (i) and (ii) are False
• (C) (i) is True and (ii) is False
• (D) (i) is False and (ii) is True

3. Which of the following statements is NOT correct?

• (A) Loose sand exhibits contractive behavior upon shearing
• (B) Dense sand when sheared under undrained condition, may lead to generation of negative pore pressure
• (C) Black cotton soil exhibits expansive behavior
• (D) Liquefaction is the phenomenon where cohesionless soil near the downstream side of dams or sheet-piles loses its shear strength due to high upward hydraulic gradient

4. For steady incompressible flow through a closed-conduit of uniform cross-section, the direction of flow will always be:

• (A) from higher to lower elevation
• (B) from higher to lower pressure
• (C) from higher to lower velocity
• (D) from higher to lower piezometric head

5. Total Kjeldahl Nitrogen (TKN) concentration (mg/L as N) in domestic sewage is the sum of the concentrations of:

• (A) organic and inorganic nitrogen in sewage
• (B) organic nitrogen and nitrate in sewage
• (C) organic nitrogen and ammonia in sewage
• (D) ammonia and nitrate in sewage