431. Depletion of ozone layer in the outer atmosphere may cause___________________ ?
A. Lung cancer
B. Skin cancer
C. Bronchitis
D. Heart disorder
✅ The correct answer is option B.
Civil Engineering
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432. The most efficient cross section of sewers in a separate sewerage system is__________________?
A. Parabolic
B. Circular
C. Rectangular
D. New egged
✅ The correct answer is option B.
433. The ratio of minimum hourly flow to the average flow of sewage is_________________?
A. 1/4
B. 1/3
C. 1/2
D. 3/4
✅ The correct answer is option B.
434. Surface energy per unit area of a surface is numerically equal to ___________________?
A. atmospheric pressure
B. surface tension
C. force of adhesion
D. force of cohesion
✅ The correct answer is option B.
435. For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?
A. Potassium permanganate
B. Sulphuric acid and napthamine
C. Phenol-di -sulphuric acid potassium hydroxide
D. None of these
✅ The correct answer is option B.
436. The flow back of profit plus depreciation form a given project is called ___________________?
A. Capital recovery
B. Cash flow
C. Economic return
D. Earning value
✅ The correct answer is option B.
437. In sewers the velocity of flow should not be_________________?
A. More than the self-cleansing velocity
B. Less than the self-cleansing velocity
C. Less than 10 m/sec
D. More than 20 m/sec
✅ The correct answer is option B.
438. In case of bankruptcy of a partnership________________?
A. The partners are not liable for the liabilities of the partnership
B. The partnership assets (excluding the partners personal assets) only will be used to pay the liabilities
C. The partners personal assets are attached to the debt of the partnership
D. The partners nay sell stock to generate additional capital
✅ The correct answer is option B.
439. The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?
A. 25,000 to 35,000 litres/sqm/day
B. 40,000 to 50,000 litres/sqm/day
C. 50,000 to 60,000 litres/sqm/day
D. 80,000 to 100,000 litres/sqm/day
✅ The correct answer is option B.
440. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?
A. Imhoff tanks
B. Trickling filters
C. Sludge sedimentation tanks
D. None of these
✅ The correct answer is option B.