DRDO STA Computer Science Civil Tier 2 Mock Test- 3 Free Online Test 2026

Therefore, number of links = 20/0.2 = 100

According to Newton’s law of viscosity, the shear stress is directly proportional to the rate of shear strain or rate of angular deformation of a fluid particle. Therefore, thea fluid particle tends to deform continuously when it is in motion.

where µ is the coefficient of viscosity

∴ The slope of the straight line obtained for Newtonian fluid on velocity gradient vs shear stress graph is viscosity.

Concrete in sea-water or exposed directly along the sea-coast shall be at least M 20 Grade in the case of plain concrete and M 30 in case of reinforced concrete. The use of slag or pozzolana cement is advantageous under such conditions.

So, given flow is laminar

For laminar flow,

Friction factor f = 64/R_e

= 64/640 = 0.1

10° on the broad gauge,

16° on the meter gauge, and

40° on the narrow gauge.

Drip irrigation is used in areas with severe water scarcity because it delivers water directly to the plant roots. This method:

• Minimises evaporation
• Reduces runoff
• Conserves water efficiently

Very short columns with effective length less than three times least lateral dimension are called pedestal columns.

Grade compensation on B.G. is equal to 0.04 percent per degree of curve,

Compensation allowed = 0/04 × 4 = 0.16 per cent.

Now, gradient of curve is 1:200 i.e. 0.5 per cent.

∴ Actual Gradient = 0.50 – 0.16 = 0.34 per cent or 1:294

Important Point:

Grade compensation for different tracks on curves

The table below shows a comparison between all different types of excavating equipment.

δl=P×L/A×E

Where

δl = deformation of a bar

L = Length of a bar

A = cross-sectional area of bar

E = Modulus of Elasticity of section

Calculation:

Given: L = 2000 mm, E = 2.1 × 10⁵ N/mm² and P = 10⁵ N

L = NS²/8H

Where the height of headlight = 0.75

L = NS²/6

The temperature at which the creep becomes an important consideration is called HOMOLOGOUS TEMPERATURE and this temperature is nearly half of the melting point temperature.

Concept:

Carbonate hardness = minimum of {Alkalinity, Total Hardness}

Total hardness = Carbonate Hardness + Non-carbonate Hardness.

Calculation:

Carbonate Hardness= minimum of {200 mg/L , 250 mg/L}

Carbonate Hardness = 200 mg/L as CaCO3

Non-Carbonate Hardness = Total Hardness – Carbonate Hardness

= 250 – 200

= 50 mg/L ​as CaCO₃

i) Name of the authorities inviting tender

ii) Name of Work and its location

iii) Estimated cost

iv) Time of completion

v) Cost of a complete set of tender forms and conditions

vi) Date, time, and place of tender

vii) Amount of earnest money and security money

viii) Validity of tender

Weighing type: Weights the rain which falls into a bucket placed on the platform of a spring or lever balance. The increasing weight of the bucket helps in recording the increasing quantity of collected rain, with time, by moving a pen on a revolving drum.

Symon’s Gauge: A non recording rain gauge.

Natural syphon type : A float type gauge, provided with a self-starting symphonic arrangement is most widely used in India; and is population known as natural syphon recording rain gauge.

It should include the following details:

i) The shape of the plot and the boundary of the plot with all exterior dimensions.

ii) Setback line at the front, back, and sides.

iii) Any permanent boundaries or marks if any existing on-site.

iv) Type of existing street on the road along with its name and width should be indicated.

v) Grade elevation along the centerline, corners of the plot, and corners of the house by mean of contour lines of the surface.

vi) North line and wind direction should be indicated clearly.

vii) Width and types of footing.

viii) Location of the fire hydrant should be shown.

ix) Size, detail, type, and location of all the underground connections.

x) Zoning and restrictions for the building should be mentioned.

1. Shooting: The art of dressing of edges of timber pieces so as to make them straight and square with the face.

2. Rebating: The process of preparing a rectangular portion on the edge of a timber piece so as to receive another timber piece which is also similarly cut.

3. Sawing: The art of cutting of wood by means of the saws is known as the sawing.

4. Studding: The fixing of small timber battens to the timber walls to which laths and boards are to be nailed.

Minimum wetted perimeter design for a given cross-sectional area gives the maximum discharge for the section and hence it is termed as the most efficient section.

∴ To design an efficient channel, the wetted perimeter for the given discharge, should be minimum.

Erosion of soil material can work its way back into the embankment, creating voids in the form of channels or ‘pipes,’ thus impairing the dam’s stability.

This form of soil erosion from the structure’s foundation is referred to as piping and occurs when water flows upwards, resulting in zero effective stress.

The phenomenon is seen in cohesionless soil, which loses its shear strength due to a high upward hydraulic gradient.

The piping failure in a hydraulic structure can be prevented by-

1. Increasing the stress due to the weight of the structure

2. Increasing the creep length of the flow of water

3. By introducing an inverted filter on the downstream side

∴ For a curved beam loaded with point load, at any section x-x

There will be an action of Shear Force, Bending Moment, and Torsional Moment as shown in the figure.

Location surveys → To depicts data of any specific location or property

Engineering surveys → To obtain data for carrying out any type of project such as road, railways, water supply, etc.

Cadastral surveys → To show boundaries of the field, buildings, etc.

Topographical surveys → To show natural features of the country such as rivers, hills, streams, lakes, roads bridges, town, etc.

 When Portland cement is blended with water, heat will be generated. This heat is named the heat of hydration, and it is the product of the exothermic chemical reaction between cement and water.