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Wastes may be sealed in concrete - fille...

Wastes may be sealed in concrete - filled drums and discharged to a depth of about 500m. This specific statement is true for :

A

Pesticide pollutants

B

U.V. radiation pollutants

C

Heavy metal pollutants

D

All radioactive pollutants

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The correct Answer is:
D
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Wastes may be sealed in concrete-filled drums and discharged to a depth of about 500 m. This specific statement is true for

Wastes may be sealed in concrete-filled drums and discharged to a depth of about 500 m. This specific statement is true for

The word fluid means a substance having particles which readily of its magnitude (a small shear stress, which may appear to be of negligible will cause deformation in the fluid). Fluids are charactrised by such properties as density. Specific weight, specific gravity, viscosity etc. Density of a substance is defined as mass per unit volume and it is denoted by. The specific gravity represents a numerical ratio of two densities, and water is commonly taken as a reference substance. Specific gravity of a substance in written as the ratio of density of substance to the density of water. Specific weight represents the force exerted by gravity on a unit volume of fluid. It is related to the density as the product of density of a fluid and acceleration due to gravity. Viscosity is the most important and is recognized as the only single property which influences the fluid motion to a great extent. The viscosity is the property by virtue of which a fluid offers resistance to deformation under the influenece if shear force. The force between the layers opposing relative motion between them are known as forces of viscosity. When a boat moves slowly on the river remains at rest. Velocities of different layers are different. Let v be the velocity of the level at a distance y from the bed and V+dv be the velocity at a distance y+dy . The velocity differs by dv in going through a distance by perpendicular to it. The quantity (dv)/(dy) is called velocity gradient. The force of viscosity between two layers of a fluid is proportional to velocity gradient and Area of the layer. F prop A & F prop (dv)/(dy) F= -etaA(dv)/(dy) ( -ve sign shown the force is frictional in nature and opposes relative motion. eta coefficient of dynamic viscosity Shear stress (F)/(A)= -eta(dv)/(dy) and simultaneously kinematic viscosity is defined as the dynamic viscosity divided by the density. If is denoted as v . The viscosity of a fluid depends upon its intermolecular structure. In gases, the molecules are widely spaced resulting in a negligible intermolecular cohesion, while in liquids the molecules being very close to each other, the cohesion is much larger with the increases of temperature, the cohesive force decreases rapidly resulting in the decreases of viscosity. In case of gases, the viscosity is mainly due to transfer of molecular momentum in the transerve direction brought about by the molecular agitation. Molecular agitation increases with rise in temperature. Thus we conclude that viscosity of a fluid may thus be considered to be composed of two parts, first due to intermolecuar cohesion and second due to transfer of molecular momentum. If the velocity profile is given by v=(2)/(3)y-y^(2)v is velocity in m//sec y is in meter above the bad. Determine shear stress at y=0.15m , & eta=0.863 Ns//m^(2)

A metal rod of length 'L' and mass 'm' is pivoted at one end. A thin disc of mass 'M' and radius 'R' (ltL) is attached at its center to the free end of the rod. Consider two ways the disc is attached : (case A). The dise is not free to rotate about its centre and (case B) the disc is free to rotate about its centre. The rod disc system perfoms (SHM) in vertical plane after being released from the same displacement position. Which of the following statement (s) is (are) true ? .

Water is filled in a rectangular tank of size 3mxx2mxx1m . a) Find the total force exerted by the water on the bottom surface of the tank. b) Consider a vertical side of area 2mxx1m . Take a horizontal strip of wide deltax metre in this side, situated at a depth of x metre from the surface of water.Find the force by the water on this strip. c) Find the torque of the force calculate in part b) about the bottom edge of this side. d) Find the total force by the water on this side. e) Find the total torque by the water on the side about the bottom edge. neglect the atmospheric pressure and take =10ms^-2 .

AAKASH SERIES-ENVIRONMENTAL ISSUES-Exercise-I (Radioactive pollution)
  1. Wastes may be sealed in concrete - filled drums and discharged to a de...

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  2. Three Mile Island and Chernobyl incidents are commonly associated with

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  3. Large scale global threat is in the from of

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  4. During the past century, the temperature of earth has increased by

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  5. Which of the following pair does not represent greenhouse gases ?

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  6. Greenhouse gases are

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  7. Arrange CFC, CH(4), N(2) O and CO(2) in decreasing order according to...

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  8. CO(2), CH(4), N(2) Oand CFC are green house gases, because they can

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  9. Global warming will causes

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  10. Greenhouse effect is due to

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  11. Checking of reradiating heat by atmospheric dust O(3).CO(2) and water ...

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  12. Red the following pertaining to components the cause global warming ...

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  13. Kyoto protocal is

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  14. Surface of earth is kept warm by (a) Solar radiations (b) Geotherma...

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  15. Which of the Following conference obtained commitments from different ...

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  16. A chemical weed in troposphere and protectant in stratosphere is

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  17. Ultraviolet radiations from sunlight cause a reaction which produces

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  18. The UV- rays in atmosphere are checked by

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  19. Ozonosphere is mainly depleted by

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  20. Chlorofluorocarbons are not being used in refrigerators because they

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