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तुमची मुले सुरक्षित आहेत याची खात्री करण्यासाठी आम्ही अतिरिक्त उपाय करत आहोत. अधिक जाणून घ्या
Question Bank : Environment
1. For production of Biogas we can feed _________ along with Cowdung
a) Metal
b) Plastic
c) Organic waste
d) Paper
2. Biogas is mixture of ____, ____, ____ and ____.
a) CO2, H2O2, CH4, H2O
b) CO2, H2S, CH4, H2O
c) CO2, SO2, CH4, H2O.
d) None of the above.
3. Calorific value of wood _____ kJ/kg.
a) 8 (eight)
b) 4.5 (Four point five)
c) 22 (Twenty two)
d) 55 (Fifty five).
4. Calorific value of Biogas _____ kJ/kg.
a) 8 (eight)
b) 4.5 (Four point five)
c) 22 (Twenty two)
d) 55 (Fifty five).
5. Newton's law of viscosity relates the
a) shear stress and velocity.
b) velocity gradient and pressure intensity.
c) shear stress and rate of angular deformation in a fluid.
d)pressure gradient and rate of angular deformation.
6. Dimension of absolute viscosity is
a) ML-1T-1
b) MLT-1
c) ML-1T
d) MLT
7. Poise is converted into stoke by
a) multiplying with density(gm/c.c.).
b) dividing by density(gm/c.c.).
c) multiplying with specific gravity
d) dividing with specific gravity
8. Dimension of kinematic viscosity is
a) MLT-1
b) L2.T-1
c) L2.T
d) L2.T-2
9. With increase in the temperature, viscosity of liquid
a) increase.
b) decrease.
c) remains constant.
d) may increase or decrease; depends on the liquid.
10. For water, when the pressure increases, the viscosity
a) also increases.
b) decreases.
c) remains constant.
d) first decreases, and then increases.
11. The pressure intensity is the same in all direction at a point in fluid
a) only when the fluid is frictionless.
b) only when the fluid is at rest having zero velocity.
c) when there is no motion of one fluid layer relative to an adjacent layer.
d) regardless of the motion of one fluid layer relative to an adjacent layer.
12. Choose the set of pressure intensities that are equivalent.
a) 4.33 psi, 10 ft. of water, 8.83 inches of Hg.
b) 4.33 psi,10ft. of water, 20.7 inches of Hg
c) 10 psi, 19.7ft.of water,23.3 inches of Hg.
d) 10 psi, 19.7ft.of water,5.3 inches of Hg.
13. For a fluid rotating at constant angular velocity about vertical axis as a rigid body,
the pressure intensity varies as the
a) square of the radial distance.
b) radial distance linearly.
c) inverse of the radial distance.
d) elevation along vertical direction.
14) The Centre of pressure is
a) always below the centroid of the area
b) always above the centroid of the area.
c) a point on the line of action of the resultant force.
d) at the centroid of the submerged area.
15. A rectangular surface 3' x 4', has the lower 3' edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is
a) 39.6y
b) 48y
c) 49.2y
d) 58y
16. A stream tube is that, which has _____cross-section entirely bounded by stream lines.
a) a circular
b) any convenient
c) a small
d) a large
17. Mass velocity is independent of temperature and pressure, when the flow is
a) unsteady through unchanged cross-section.
b) steady through changing cross-section.
c) steady and the cross-section is unchanged.
d) unsteady and the cross-section is changed.
18. In turbulent flow, the
a) fluid particles move in an orderly manner.
b) momentum transfer is on molecular scale only.
c) shear stress is caused more effectively by cohesion than momentum transfer.
d) shear stresses are generally larger than in a similar laminar flow.
19. Turbulent flow generally occurs for cases involving
a) highly viscous fluid
b) very narrow passages
c) very slow motion
d) none of these
20. An ideal fluid is
a) frictionless and in compressible.
b) one, which obeys Newton's law of viscosity.
c) highly viscous.
d) none of these
21. A fluid is one, which
a) cannot remain at rest under the action of shear force.
b) continuously expands till it fills any container
c) is incompressible
d) permanently resists distortion.
22. In an incompressible fluid, the density is
a) greatly affected by moderate changes in pressure.
b) greatly affected only by moderate changes in temperature.
c) not affected with moderate change in temperature and pressure.
d) sensible to change in both temperature and pressure.
23. Potential flow is the flow of
a) compressible fluids with shear.
b) compressible fluids with no shear.
c) incompressible fluids with shear.
d) incompressible fluids with no shear.
24. Potential flow is characterized by the
a) irrotational and frictionless flow.
b) irrotational and frictional flow.
c) one in which dissipation of mechanical energy into heat occurs.
d) formation of eddies within the stream.
25. Newton's law of viscosity relates the
a) shear stress and velocity.
b) velocity gradient and pressure intensity.
c) shear stress and rate of angular deformation in a fluid.
d)pressure gradient and rate of angular deformation.
26. Dimension of absolute viscosity is
a) ML-1T-1
b) MLT-1
c) ML-1T
d) MLT
7. Poise is converted into stoke by
a) multiplying with density(gm/c.c.).
b) dividing by density(gm/c.c.).
c) multiplying with specific gravity
d) dividing with specific gravity
8. Dimension of kinematic viscosity is
a) MLT-1
b) L2.T-1
c) L2.T
d) L2.T-2
9. With increase in the temperature, viscosity of liquid
a) increase.
b) decrease.
c) remains constant.
d) may increase or decrease; depends on the liquid.
10. For water, when the pressure increases, the viscosity
a) also increases.
b) decreases.
c) remains constant.
d) first decreases, and then increases.
11. The pressure intensity is the same in all direction at a point in fluid
a) only when the fluid is frictionless.
b) only when the fluid is at rest having zero velocity.
c) when there is no motion of one fluid layer relative to an adjacent layer.
d) regardless of the motion of one fluid layer relative to an adjacent layer.
12. Choose the set of pressure intensities that are equivalent.
a) 4.33 psi, 10 ft. of water, 8.83 inches of Hg.
b) 4.33 psi,10ft. of water, 20.7 inches of Hg
c) 10 psi, 19.7ft.of water,23.3 inches of Hg.
d) 10 psi, 19.7ft.of water,5.3 inches of Hg.
13. For a fluid rotating at constant angular velocity about vertical axis as a rigid body,
the pressure intensity varies as the
a) square of the radial distance.
b) radial distance linearly.
c) inverse of the radial distance.
d) elevation along vertical direction.
14) The Centre of pressure is
a) always below the centroid of the area
b) always above the centroid of the area.
c) a point on the line of action of the resultant force.
d) at the centroid of the submerged area.
15. A rectangular surface 3' x 4', has the lower 3' edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is
a) 39.6y
b) 48y
c) 49.2y
d) 58y
16. A stream tube is that, which has _____cross-section entirely bounded by stream lines.
a) a circular
b) any convenient
c) a small
d) a large
17. Mass velocity is independent of temperature and pressure, when the flow is
a) unsteady through unchanged cross-section.
b) steady through changing cross-section.
c) steady and the cross-section is unchanged.
d) unsteady and the cross-section is changed.
18. In turbulent flow, the
a) fluid particles move in an orderly manner.
b) momentum transfer is on molecular scale only.
c) shear stress is caused more effectively by cohesion than momentum transfer.
d) shear stresses are generally larger than in a similar laminar flow.
19. Turbulent flow generally occurs for cases involving
a) highly viscous fluid
b) very narrow passages
c) very slow motion
d) none of these
20. An ideal fluid is
a) frictionless and in compressible.
b) one, which obeys Newton's law of viscosity.
c) highly viscous.
d) none of these