576. For the network shown in the above figure (the number on each arrow denotes the time duration of activity in days), the earliest star time, in days for activity 5-6 is
577. A clay layer 5 m thick in field takes 300 days to attain 50% consolidation with condition of double drainage. If the same clay layer is underlain by hard rock then the time taken to attain 50% consolidation will be
578. Two forces P = 6 N and Q = 10 N act on a particle and their lines of action are inclined to each other at an angle of 60°. What is the magnitude of the third force R which will keep the particle in equilibrium ?
579. The three-hinged arch shown in the given figure will have value of H as
580. What is 5 days 20°C BOD equal to ?
581. Consider the following statements :
In solid waste management
1. density separation of solid wastes can be accomplished by air classifiers.
2. iron recovery from solid wastes can be done by magnetic separators.
3. aluminium separation from solid wastes can be accomplished by eddy current separators. Which of the statements given above are correct ?
582. Consider the following statements :
1. Book value is the unamortized cost of the asset as it still appears on the accounting books of the business.
2. Termination of economic life implies disposal of the equipment.
Which of the statements given above is/are correct ?
583. A person of height 1.65 m standing on a cliff of height 20 m above the water level on sea-shore can sight a ship at a distance of about
584. Which of the following characteristic features may be used while plotting a contour plan ?
1. Two contour lines having the same elevation cannot unite the continue as one line.
2. Contour lines closed together indicate a gentle slope.
3. Contour lines cross a valley line at right angles.
Select the correct answer using the codes given below:
585. The radial moment at the boundary of a simply supported circular slab of radius R, subjected to a uniformly distributed load of w will be
586. Soundness test of cement is done to determine its
587. For a non-concurrent force system to be in equilibrium
588. The displacement method is also referred to as which one of the following ?
589. If the CBR value obtained at 5 mm penetration is higher than that at 2.5 mm, then the test is repeated for checking ; and if the check test reveals a similar trend, then the CBR value is to be reported as the
590. If a descending gradient of 1 in 25 meets an ascending gradient of 1 in 40, then the length of valley curve required for a headlight sight distance of 100 m will be
591. In rock masses reduction in strength occurs due to the presence of relatively large quantities of
592. What is the zone where fish life might tend to progressively dwindle when waste water, is discharged into a river, called ?
593. Which one of the following states of field compaction of sand deposit truly represents the corrected standard penetration test value : N (corrected) = 27 ?
594. A river is the source of water for water supply to a town. Its water is very turbid and polluted. The correct sequence of steps for treating the river water would be :
595. What is the probable maximum precipitation (PMP) ?
596. Westergaard's analysis for stress distribution beneath loaded area is applicable to
597. Which of the following variations of magnetic declination are correctly matched ?
1. Diurnal variation..........Variation whose time period varies from 100-350 years
2. Annual variation.........Annual rate of change of secular variation
3. Secular variaiion..........Variation of declination periodic in character
4. Irregular variation.........Caused due to magnetic storms in earth's magnetic field
Select the correct answer using the codes given below :
598. In order to find the resultant of a system of coplanar parallel system of forces, the correct sequence of the graphical procedure to be followed is
599. Given that,
t = thickness of the plates,
b = width of the plates,
d = diameter of the rivets,
n = number of rivets in a line,
σt = permissible tensile stress.
The tearing strength of the joint is given by
600. Consider the following statements pertaining to a pile group and a single pile at failure :
1. In loose and medium dense sands, the failure load per pile in a group will generally be greater than the failure load for a single pile.
2. In cohesive soils, the failure load per pile in a group will be greater than failure load for a single pile.
3. For piles driven in dense sands, the failure load per pile in a group is greater than the failure load for a single pile.
4. When the pile spacing is greater than 10 times the pile diameter, the failure loads per pile in a group and forly same in both sands and clays.
Of these statements :