HYDRAULICS ONLINE TEST SERIES FOR GATE,RRB JE, SSC JE
Q.1) Dynamic viscosity of gases?
a. decreases with decrease in fluid temperature.
b. increases with decrease in fluid temperature.
c. does not change with fluid temperature.
d. is dependent on pressure.
Solution.
Correct Ans. A (decreases with decrease in fluid temperature.)
Decreases with decrease in fluid temperature Because of Random Movement Of Gasses Particle
Q.2) The total pressure on a circular plate of diameter 2 m which is placed vertically in water in such a way that the center of the plate is 3 m below the free surface of water is
a. 52.00 kN
b. 69.23 kN
c. 86.85 kN
d. 92.41 kN
Correct Ans. D
SOLN-
Q.3 Center of buoyancy is?
a. the point through which the submerged weight of the body acts
b. the point through which the gravitational force acts.
c. the point through which the resultant hydrostatic force acts
d. the center of gravity of liquid displaced by the body.
Correct Ans. D (the center of gravity of liquid displaced by the body.)
Q.4) Irrotational flow is characterised as the one in which?
a. the fluid flows along a straight path.
b. the fluids does not rotate as it moves along.
c. the net rotation of fluid particles about their mass centers remains zero.
d. the streamlines of flow are curved and closely spaced.
Correct Ans. C (the net rotation of fluid particles about their mass centers remains zero.)
Q.5) The piezometric head is the summation of?
a. velocity head and elevation head.
b. velocity head and pressure head.
c. pressure head and elevation head.
d. none of the above.
Correct Ans. C ( pressure head and elevation head.)
Q.6) The boundary layer exists in?
a. flow of ideal fluids
b. flow of real fluids
c. only pipe flow
d. only flow over flat surfaces
Correct Ans. B ( flow of real fluids)
For Soil Mechanics Mcq
Q.7) Uniform flow in open channels is characterised by?
a. a changing depth of flow.
b. a constant discharge passing down the channel.
c. a constant depth of flow.
d. no variation of velocity at a flow section with respect to time.
Correct Ans. C (a constant depth of flow.)
Q.8) Hydraulically efficient channel cross-section is one which?
a. has the minimum hydraulic resistance.
b. carries maximum discharge under given conditions of slope, roughness and flow area.
c. has maximum possible slope consistent with the topography.
d. has the maximum wetted perimeter.
Correct Ans. B (carries maximum discharge under given conditions of slope, roughness and flow area.)
Q.9) Along a straight streamline passing through the origin the velocity is given by V = 4(X^2 + Y^2)^1/2
The acceleration at the point (4, 3) is _________ m/s2.
Correct Ans. 80
SOLN-
Q.10 ) Water is flowing through a horizontal conical pipe whose diameter changes from 20 cm to 10 cm over a length of 1 m. The velocity of flow is 4 m/s at the bigger diameter section. The velocity head at the middle of the pipe is _________ m.?
Correct Ans. 2.58 (2.5 - 2.7)
Q.11) An oil of viscosity 0.01 Ns/m2 is flowing between two stationary parallel plates 2 m wide maintained 10 mm apart. The velocity midway between the plates is 2 m/s. The pressure gradient along the flow is _______________ N/m2/m.
Correct Ans. -1600
prarocks
Q.12) Three pipes of lengths 1000 m, 2000 m and 3000 m and diameters 200 mm, 400 mm and 600 mm respectively are connected in series. These pipes are to be replaced by a single pipe of 6000 m. The diameter of this single pipe is _________ mm.
Correct Ans.282 (277 - 287)
Q.13) In the model of a highway bridge constructed to a scale of 1 : 15, the force of water on
the pier was measured to be 0.8 Newton. The force on the prototype pier is _________
Newton.
Correct Ans.2700
Q.14 The force exerted by a jet of water of diameter 70 mm on a stationary flat plate, when the jet strikes the plate normally with a velocity of 10 m/s is _________ Newton.
Correct Ans 385 (382 - 388)
Q.15) At a hydraulic jump, the depths on the two sides are 0.6 m and 1.8 m. The head loss in the jump is __________ m.
Correct Ans. 0.4
Q.16) A rigid boundary rectangular channel having a bed slope of has its width and depth of flow equal to 4 m and 2 m respectively. The value of Chezy’s constant is 60 and the flow is uniform. The discharge through the channel is _________ m3/s.?
Correct Ans.12
Q.17) A liquid with a volume of 0.2 m3 at 300 kPa is subjected to a pressure of 3000 kPa and its volume is found to decrease by 0.2%. Calculate the bulk modulus of elasticity of the liquid.
a. 7.7 × 105 kPa
b. 9.8 × 105 kPa
c. 12.0 × 105 kPa
d. 13.5 × 105 kPa
Correct Ans. D (13.5 × 105 kPa)
Q.18 A circular plate 5.0 m diameter is immersed in water in such a way that its greatest and least depth below the free surface are 5 m and 2.5 m respectively. The total pressure on one face of the plate and position of center of pressure respectively are:
a. 525 kN and 3.85 m
b. 722 kN and 4.9 m
c. 722 kN and 3.85 m
d. 705 kN and 3.78
Correct Ans. C
Q.20 The hydraulic grade line is one which indicates the variation of?
a. Total energy of flow in the direction of flow.
b. Piezometric head in the direction of flow.
c. Velocity head in flow direction.
d. Pressure head in the direction of flow.
Correct Ans. B (Piezometric head in the direction of flow.)
Q.21) In a supercritical flow, as the specific energy in a channel is decreased, the depth of flow?
a. also decreases
b. increases
c. does not vary
d. approaches to a minimum value which corresponds to maximum specific energy.
Correct Ans. B (increases)
Q.22 The most essential condition for a hydraulic jump to form is?
a. the existence of subcritical flow before the jump.
b. the existence of critical flow before the jump.
c. the existence of supercritical flow before the jump.
d. the constancy of specific energy.
Correct Ans. C (the existence of supercritical flow before the jump.)
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Q.1) Dynamic viscosity of gases?
a. decreases with decrease in fluid temperature.
b. increases with decrease in fluid temperature.
c. does not change with fluid temperature.
d. is dependent on pressure.
Solution.
Correct Ans. A (decreases with decrease in fluid temperature.)
Decreases with decrease in fluid temperature Because of Random Movement Of Gasses Particle
Q.2) The total pressure on a circular plate of diameter 2 m which is placed vertically in water in such a way that the center of the plate is 3 m below the free surface of water is
a. 52.00 kN
b. 69.23 kN
c. 86.85 kN
d. 92.41 kN
Correct Ans. D
SOLN-
Q.3 Center of buoyancy is?
a. the point through which the submerged weight of the body acts
b. the point through which the gravitational force acts.
c. the point through which the resultant hydrostatic force acts
d. the center of gravity of liquid displaced by the body.
Correct Ans. D (the center of gravity of liquid displaced by the body.)
Q.4) Irrotational flow is characterised as the one in which?
a. the fluid flows along a straight path.
b. the fluids does not rotate as it moves along.
c. the net rotation of fluid particles about their mass centers remains zero.
d. the streamlines of flow are curved and closely spaced.
Correct Ans. C (the net rotation of fluid particles about their mass centers remains zero.)
Q.5) The piezometric head is the summation of?
a. velocity head and elevation head.
b. velocity head and pressure head.
c. pressure head and elevation head.
d. none of the above.
Correct Ans. C ( pressure head and elevation head.)
Q.6) The boundary layer exists in?
a. flow of ideal fluids
b. flow of real fluids
c. only pipe flow
d. only flow over flat surfaces
Correct Ans. B ( flow of real fluids)
For Soil Mechanics Mcq
Q.7) Uniform flow in open channels is characterised by?
a. a changing depth of flow.
b. a constant discharge passing down the channel.
c. a constant depth of flow.
d. no variation of velocity at a flow section with respect to time.
Correct Ans. C (a constant depth of flow.)
Q.8) Hydraulically efficient channel cross-section is one which?
a. has the minimum hydraulic resistance.
b. carries maximum discharge under given conditions of slope, roughness and flow area.
c. has maximum possible slope consistent with the topography.
d. has the maximum wetted perimeter.
Correct Ans. B (carries maximum discharge under given conditions of slope, roughness and flow area.)
Q.9) Along a straight streamline passing through the origin the velocity is given by V = 4(X^2 + Y^2)^1/2
The acceleration at the point (4, 3) is _________ m/s2.
Correct Ans. 80
SOLN-
Q.10 ) Water is flowing through a horizontal conical pipe whose diameter changes from 20 cm to 10 cm over a length of 1 m. The velocity of flow is 4 m/s at the bigger diameter section. The velocity head at the middle of the pipe is _________ m.?
Correct Ans. 2.58 (2.5 - 2.7)
Q.11) An oil of viscosity 0.01 Ns/m2 is flowing between two stationary parallel plates 2 m wide maintained 10 mm apart. The velocity midway between the plates is 2 m/s. The pressure gradient along the flow is _______________ N/m2/m.
Correct Ans. -1600
prarocks
Q.12) Three pipes of lengths 1000 m, 2000 m and 3000 m and diameters 200 mm, 400 mm and 600 mm respectively are connected in series. These pipes are to be replaced by a single pipe of 6000 m. The diameter of this single pipe is _________ mm.
Correct Ans.282 (277 - 287)
Q.13) In the model of a highway bridge constructed to a scale of 1 : 15, the force of water on
the pier was measured to be 0.8 Newton. The force on the prototype pier is _________
Newton.
Correct Ans.2700
Q.14 The force exerted by a jet of water of diameter 70 mm on a stationary flat plate, when the jet strikes the plate normally with a velocity of 10 m/s is _________ Newton.
Correct Ans 385 (382 - 388)
Q.15) At a hydraulic jump, the depths on the two sides are 0.6 m and 1.8 m. The head loss in the jump is __________ m.
Correct Ans. 0.4
Q.16) A rigid boundary rectangular channel having a bed slope of has its width and depth of flow equal to 4 m and 2 m respectively. The value of Chezy’s constant is 60 and the flow is uniform. The discharge through the channel is _________ m3/s.?
Correct Ans.12
Q.17) A liquid with a volume of 0.2 m3 at 300 kPa is subjected to a pressure of 3000 kPa and its volume is found to decrease by 0.2%. Calculate the bulk modulus of elasticity of the liquid.
a. 7.7 × 105 kPa
b. 9.8 × 105 kPa
c. 12.0 × 105 kPa
d. 13.5 × 105 kPa
Correct Ans. D (13.5 × 105 kPa)
Q.18 A circular plate 5.0 m diameter is immersed in water in such a way that its greatest and least depth below the free surface are 5 m and 2.5 m respectively. The total pressure on one face of the plate and position of center of pressure respectively are:
a. 525 kN and 3.85 m
b. 722 kN and 4.9 m
c. 722 kN and 3.85 m
d. 705 kN and 3.78
Correct Ans. C
Q.20 The hydraulic grade line is one which indicates the variation of?
a. Total energy of flow in the direction of flow.
b. Piezometric head in the direction of flow.
c. Velocity head in flow direction.
d. Pressure head in the direction of flow.
Correct Ans. B (Piezometric head in the direction of flow.)
Q.21) In a supercritical flow, as the specific energy in a channel is decreased, the depth of flow?
a. also decreases
b. increases
c. does not vary
d. approaches to a minimum value which corresponds to maximum specific energy.
Correct Ans. B (increases)
Q.22 The most essential condition for a hydraulic jump to form is?
a. the existence of subcritical flow before the jump.
b. the existence of critical flow before the jump.
c. the existence of supercritical flow before the jump.
d. the constancy of specific energy.
Correct Ans. C (the existence of supercritical flow before the jump.)
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