The rocks having alumina or clay as their significant components are known as
ISRO Scientist or Engineer Civil 2018
For the following questions answer them individually
Age of a tree may be ascertained by
A pug mill is used for
The foundation in which a cantilever beam is provided to join two footings is called
A covering of concrete placed on the exposed top of an external wall is known as
The vertical members fixed between steps and handrail in a staircase is known as
The under surface of an arch is called
The vertical sides of a door and window openings provided in a wall are known as
The least count of a vernier scale is
The bearing of line XY is $$195^\circ$$and that of line ZY is $$255^\circ 45’$$. The included angle XYZ is
An imaginary line joining the points of equal elevation on the surface of the earth represents
If the whole circle bearing of a line is $$145^\circ,$$ its reduced bearing is
The representative fraction 1/1800 means that the scale is
The true meridian of a place is the line in which earth’s surface is intersected by a plane through
Removal of parallax in a Theodolite can be achieved by focusing
The proportion of second moment of area about the centroidal axis to second moment of area about the base of a rectangle will be
Centre of gravity of a thin hollow cone lies on the axis of symmetry at a height of
The angle of friction is
The path traced by a projectile in the sky is
Periodic time of a particle moving with simple harmonic motion is the time taken by the particle for
When a body moves around a fixed axis it has
If $$g_1$$ and $$g_2$$ are the gravitational acceleration on two mountains A and B respectively, then the weight of body when transported from A to B will be multiplied by
The two forces of 9 Newtons and 12 Newtons which are acting at right angles to each other will have a resultant of
The distance between the centres of adjacent rivets in the same row is called
Along the principal plane subjected to maximum principal stresses
The bending moment is maximum on a section of a beam where shearing force
The shear force on a simply supported beam is proportional to
Struts are the load carrying members of a frame which are subjected to
When a body is elastically stretched, the value of Poisson’s ratio always remains
Fluids undergo volume change under external pressure due to
A trapezoidal channel has a bottom width of 6m and side slope of 1:1. The depth of flow is 1.5 m at a discharge of 15 cum/sec. The hydraulic radius and hydraulic average depth of flow respectively are
The unit of kinematic viscosity is
A floating body attains stable equilibrium if its metacentre is
The equation of continuity of flow is based on the principle of conservation of
Weber number is the ratio of inertia force to
Water contains
If 2% solution of a sewage sample is incubated for 5 days at 20 degrees and depletion of oxygen was found to be 5 ppm, BOD of the sewage is
In a sludge digestion tank, the gas that mainly evolves is
The per capita demand of water is calculated in litres
Zero hardness of water can be achieved by
Surge tanks are provided
The ratio of volume of water present in a given soil mass to the total volume of its voids is known as
The consistency index of soil is defined as the ratio of
The angle of internal friction is least for
Failure of slopes occurs only when total shear force is
The compression resulting from a long term static load and consequent escape of pore water is known as
A partially saturated soil is classified as
Uniformity coefficient of a well graded soil is
The water content of a soil at which the soil volume becomes constant is called
As per BIS 456-2000 (reaffirmed 2005), the minimum grade of concrete, with normal weight aggregate of 20 mm nominal maximum size, specified for a severe exposure condition is
Which one of the following is employed to determine the strength of hardened concrete of an existing concrete structure?
Tricalcium aluminates (C3A)
The Vicat’s apparatus is used for testing cement for its
If 1000 gms of sand is sieved through 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 gms, 100 gms, 150 gms, 200 gms, 350 gms and 200 gms respectively, then the fineness modulus of the sand is
Workability of a concrete mix with low water cement ratio is determined by
In a singly reinforced beam, the effective depth is measured from its compression edge to
The maximum shear stress in a rectangular beam is
A soil sample is partially saturated. Its natural moisture content was found to be 22% and bulk density 2 gms/c.c. If the specific gravity of the solid particles is 2.65 and the density of water is 1 gms/c.c, the void ratio of the sample is
The horizontal distance between parallel main reinforcement bars shall not be more than ------------ the effective depth of solid slab.
If the span to effective depth ratio of a simply supported beam, for span upto 10 m, does not exceed ------------, the vertical deflection limits may generally be satisfied.
Tension failure occurs in a singly reinforced beam in
Net sectional area of a tension member is equal to its gross sectional area
A cantilever beam ‘A’ with rectangular cross section is subjected to a concentrated load at its free end. If the width and depth of another cantilever beam ‘B’ are twice those of beam ‘A’ and subjected to the same load, then the deflection at the free end of beam ‘B’ as compared to that of ‘A’ will be
The difference in level between the top of a bank and supply level in a canal, is called
The river training work is generally required when the river is
In water bound macadam roads, the binding material is
A gradient along which the vehicle does not require any tractive effort to maintain a specified speed is known as
To prevent creep in rails, the steel sleepers are fixed with rails by
What is the volume of a 6m deep tank having rectangular shaped top $$6 m \times 4 m$$ and bottom $$4 m \times 2 m$$ computed through the use of Prismoidal formula?
The area to be measured for painting distemper for an internal surface of a plastered 230 mm thick brick wall having dimension of 3000 mm length and 3200 mm height and having a glazed louvered ventilator of size 600 mm $$\times$$ 400 mm in the wall is
The value of
is
A rectangular sheet of metal of length 6m and width 2 m is given. Four equal squares are removed from the corners. The sides of this sheet are now turned up to form an open rectangular box. The height of box such that the volume of the box is maximum will be
The complete solution of the linear differential equation
$$\frac{\text{d}^2z}{\text{d}t^2} + (p + q) \frac{\text{d}z}{\text{d}t} + pqz = 0$$
The sequence $$\lim_{a \rightarrow \infty} \left[ 3 + (-1)^n\right]$$ is
Then the product of determinant P and Q ( PQ ) has the value
The differential equation $$y = x \frac{\text{d}y}{\text{d}x} + \frac{x}{\frac{dy}{dx}}$$ is
In a square matrix $$A = [ a_ij ],$$ if $$a_ij = − a_ji$$ for all i and j so that all the leading diagonal elements are zero, then the matrix is called
The difference of two complex numbers $$(x_1 + iy_1)$$ and $$(x_2 + iy_2)$$ is
The value of $$\lim_{x \rightarrow 0} \frac {\log x}{\cot x}$$ is
A box contains 5 red and 10 green balls. Eight (8) of them are placed in another box. The chances that the latter box contains 2 red and 6 green balls are
