451. Which one of the following is the correct statement ? A streamlined body is one for which the
452. The correct sequence of plasticity of min-erals in soil in an increasing order is
453. Why is a proportional flow weir provided in a grit chamber ?
454. The "Back sight" reading on a vertically held staff at a point A on the floor along the centre line of a railway tunnel is 3.465 m, and the "Fore sight" on the inverted staff held at the roof of the tunnel just vertically above A is 1.115 m. The height of the tunnel along the centre line at floor point A is
455. The tipping load of a crane refers to
456. According to the theory of filtration in water treatment, which of the following mechanisms come into play when water is filtered through a filter bed ?
1. Mechanical straining
2. Capillary action
3. Centrifugal force
4. Electro kinetic phenomenon
5. Osmotic force
6. Bacteriological action
Select the correct answer using the code given below :
457. A ball of mass 1 kg moving with a velocity of 2 m/s collides directly with a stationary ball of mass 2 kg and comes to rest after the impact. The velocity of the second ball after impact will be
458. Consider the following statements :
In the critical path method of construction planning free float can be
1. greater than total float
2. greater than independent float
3. equal to total float
4. less than independent float.
Of these statements :
459. In a cantilever beam, the bending moment at any section of the beam is equal to the
460. Which one of the following is the correct sound intensity expression with usual notations ?
461. A three-hinged parabolic arch rib with hinges at abutments and at crown is under the action of uniformly distributed load 'W' per unit length over its entire span 'l' through its crown. The bending moment at quarter span is
462. A bulldozer operates on a 30 m stretch and moves at 2.4 kmph when pushing the earth, and returns empty at 6 kmph. The time lost in loading and shifting gears per trip is 18 seconds. Its operating factor is nearly 50 min/hour. What is the number of trips made per hour ?
463. In the case of panel wall subjected to horizontal loads at right angles to the plane of the wall, with the mortar not leaner than M1 type, tensile stress in bending in the vertical direction may be allowed to the extent of
464. The 'Euler' load for a column is 1000 kN and crushing load is 1500 kN. The 'Rankine' load is equal to
465. In "full face" method of constructing tunnel, the first operation relates to
466. Which one of the following statements best defines a 'level surface'?
467. In a shape test of aggregate, which one of the following gives the correct slot for flakiness index of a material passing 50 mm sieve and retained on 40 mm sieve ?
468. Ruling gradient on highways as per IRC in plane terrain is
469. For a symmetrical continuous beam as shown in the figure given above, which one of the following is correct in respect of distribution factors at B ?
470. For the retaining wall shown in the given figure, if the stress at the heel is zero, then the maximum storage 'H' will be specific gravity of the material of the wall = 2.25
471. A short column of external diameter D1 and internal diameter D2 carries an external load W. For no-tension condition, the eccentricity will be :
472. The following four hydrological features have to be estimated or taken as inputs before one can compute the flood hydrograph at any catchment outlet:
1. Unit hydrograph
2. Rainfall hydrograph
3. Infiltration index
4. Base flow
The correct order in which they have to be employed in the computations is
473. Which one of the following statements is correct ?
A forebay in a hydel system is provided at the junction of :
474. Consider the following statements :
Higher water-cement ratio in concrete results in
1. stronger mix.
2. better workable mix.
3. a weak mix.
4. less bleeding.
475. Which one of the following is not the reason for coning of wheels ?