ISRO Draughtsman Civil Mock Test - 7 - Civil Engineering (CE) MCQ

Hence the correct answer is option B.

Error is half the difference between the face left and face right observation. This discussion on The difference between face left and face right observation of a theodolite is 3'

Local shear failure occurs in case of loose sand and soft clays where large settlement may occur below the foundation before soil reaches to plastic state.

Plane surveying: Mean surface of earth is considered as plane.
Geodetic surveying: Curvature of the earth is taken into account.

Gypsum acts as a retarder. It counteracts the fast rate of hydration (for which C₃A is primarily responsible) to prevent flash set.

In intersection method of plane table surveying, the objects or points to be located are obtain at the point of intersection of radial lines drawn from two different stations. The intersection method is suitable when distances of objects are large or cannot be measured properly. Thus, this method is preferred in small scale survey and for mountainous regions.

(EI(dy/dx)=slope)

(EI(d²y/dx²)=moment)

(EI(d³y/dx³)=shear)

Hence the option D is correct.

Pore pressure

Effective stress

If the water table rises above the ground level, the total stress and neutral stress will increase by the same magnitude, but effective stress remains unchanged.

Hence the correct answer is option C.

Hence the correct answer is option d.

Hence, the correct answer is (a).

Hence the correct answer is option A.

The spacing of longitudinal bars measured along the periphery of the column shall not exceed 300 mm. In a pedestal of a column, the area of the longitudinal reinforcement shall not be less than 0.15% of the gross area.

Hence the correct answer is option C.

Hence, the correct option is (B)

• The error in measured length due to bad ranging is always positive as the measured value due to bad ranging is always greater than the actual value.
• As the error in measured length due to the careless holding of the chain is an accidental error and accidental errors as obvious compensating in nature.
• Correction for Pull (C_p):
• 

Where,

P = Pull applied during measurement

P_o = Standard Pull

L = length of the tape

E = Young’s modulus of elasticity

So, when P > P_o, the corrective will be positive, and the error will therefore be negative.

• If the chain used in measuring a distance is too short, the error will be positive, and correction will be negative and vice versa.

Specific Energy,

Where y = depth of the flow

v = velocity of the flow

g = acceleration due to gravity

Submerged pipe outlet is a non-modular type of outlet so the discharge depends upon the water level in both the minor and well chamber.

Thus discharge through outlet can be increased by increasing H_L or by increasing the depth of water in the minor. If there is any drop in the water level in the minor, the H_L and discharge will decrease.

The other common examples of this type of outlet are

a) Open Sluice

b) Drowned pipe outlet

• The permissible limit of mercury is less than 0.001 mg/l i.e., at very small concentrations elemental form of mercury is toxic to the central and peripheral nervous systems of humans

• Mercury inhalation can damage respiratory systems and hamper lungs and kidneys

Floating: It is the process of removing the irregularities on the surface of the concrete which is left after screeding.

Trowelling: Trowelling is the final operation of finishing. It provides a smoother finish that is hard and abrasion-resistant.