# If f(x, y, z) = (x2 +y2 +z2) -1/2 then  is equal to

1.  Zero

2.  1

3.  2

4.  - 3 (x2 + y2 + z2) -5/2

4

- 3 (x2 + y2 + z2) -5/2

Explanation :
No Explanation available for this question

# Let F(s) =F [f(t)] denote the Laplace transform of the function f(t). Which of the following statements is correct

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A soil mass contains 40% gravel, 50% sand and 10% silt. This soil can be classified as

1.   silty sandy gravel having coefficient of uniformity less than 60.

2.   silty gravelly sand having coefficient of uniformity equal to 10.

3.   gravelly silty sand having coefficient of uniformity greater than 60.

4.   gravelly silty sand and its coefficient of uniformity cannot be determined.

4

silty gravelly sand having coefficient of uniformity equal to 10.

Explanation :
No Explanation available for this question

# A saturated soil mass has a total density 22kN/m3 and a water content of 10%. The bulk density and dry density of this soil are

1.  12 kN/m3 and 20 kN/m3 respectively.

2.  22 kN/m3 and 20 kN/m3 respectively.

3.  19.8 kN/m3 and 19.8 kN/m3 respectively.

4.  23.2 kN/m3 and 19.8 kN/m3 respectively.

4

22 kN/m3 and 20 kN/m3 respectively.

Explanation :
No Explanation available for this question

# In a constant head permeameter with cross section area of 10 cm2, when the flow was taking place under a  hydraulic gradient of 0.5, the amount of water collected in 60 seconds is 600 cc. The permeability of the soil is

1.  0.002 cm/s

2.  0.02 cm/s

3.  0.2 cm/s

4.  2.0 cm/s

4

2.0 cm/s

Explanation :
No Explanation available for this question

# Critical depth at a section of a rectangular channel is 1.5 m. The specific energy at that section is

1.  0.75 m

2.  1.0 m

3.  1.5 m

4.  2.25 m

4

2.25 m

Explanation :
No Explanation available for this question

# A partially open sluice gate discharges water into a rectangular channel. The tail water depth in the gate after the vena contracta of the jet coming out from the sluice gate, the sluice gate opening should be (coefficient of contraction channel is 3m and Froude number is 1/2√2.If a free hydraulic jump is to be formed at a downstream of the sluice Cc=0.9)

1.  0.3 m

2.  0.4 m

3.  0.69 m

4.  0.9 m

4

0.69 m

Explanation :
No Explanation available for this question

# A tank and a deflector are placed on a frictionless trolley. The tank issues water jet (mass density of water =1000 kg/m3), which strikes the deflector and truns by 450. If the velocity of jet leaving the deflector is 4 m/s and discharge is 0.1 m3/s, the force recorded by the spring will be

1.  100N

2.  100√2N

3.  200N

4.  200√2N

4

200√2N

Explanation :
No Explanation available for this question

# Two observation wells penetrated into a confined acquifer and located 1.5 km apart in the direction of flow, indicate head of 45 m and 20 m. If the coefficient of permeability of the acquifer is 30m/day and porosity is 0.25, the time of travel of an inert tracer from one well to another is

1.  416.7 days

2.  500 days

3.  750 days

4.  3000 days

4

750 days

Explanation :
No Explanation available for this question

1.   1.98 m

2.   2.98m

3.   3.62m

4.   5.62m

4