Group symbols assigned to silty sand and clayey sand are respectively

In a BOD test
using 5% dilution of the sample (15 ML of sample and 285 mL of dilution
water), dissolved oxygen values for the sample and dilution water blank
bottles after five days incubation at `20^circ`C were 3.80 and 8.80 mg/L.
respectively. Dissolved oxygen originally present in the undiluted
sample was 0.80 mg/L. The 5-day `20^circ`C BOD of the sample is

A footing 2 m x 1 m exerts a uniform pressure of 150 kN/m² on the soil. Assuming a load dispersion of 2 vertical to 1 horizontal the average vertical stress (kN/m²) at 1.0 m below the footing is

Two completely penetrating wells are located L (in metres) apart,
in homogeneous confined aquifer. The drawdown measured at the mid point
between the two wells (at a distance of 0.5 L from both the wells) is 2.0 m when only the first well is being pumped at the steady rate of Q₁ m³/sec. When both the wells are being pumped at identical steady rate of Q₂ m³/sec,
the drawdown measured at the same location is 8, 0 m. It may be assumed
that the drawdown at the wells always remains at 10.0 m when being
pumped and the radius of influence is larger than 0.5 L Q₁/Q₂ is equal to

Flow at critical depth takes place in an open channel When

Cavitation is caused by

A road is
provided with a horizontal circular curve having deflection angle of `55^circ`and centre line radius of 250 m. A transition curve is to be provided
at each end of the circular curve of such a length that the rate of gain
of radial acceleration is 0.3 m/s³ at a speed of 50 km per hour. Length of the transition curve required at each of the ends is

A test plate 30
cm x 30 cm resting on a sand deposit settles by 10 mm under a certain
loading intensity. A footing 150 cm x 200 cm resting on the same sand
deposit and loaded to the same load intensity settles by

Bituminous materials are commonly use in highway construction because of their good

Temporary hardness in water is caused by the presence of