How was Alexander able to turn porous elephants into kind of a weapon?

How was Alexander able to turn porous elephants into kind of a weapon?
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A tank internally measuring 150 cm × 120 cm × 100 cm has 1281600 cm^3 of water in it. Porous bricks are placed in the water until the tank -Maths 9th

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Gravity settling tanks/porous filters are used to remove particles larger than

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Last Answer : (b) they make the soil porous, leave their castings and take organic debris in the soil

Out of diffuse porous and ring porous woods, which is correct? (a) Ring porous wood carries more water for short period. (b) Diffuse porous wood carries more water. (c) Ring porous wood carries more water when need is higher. (d) Diffuse porous wood is less specialised but conducts water rapidly throughout.

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Low temperature oxidation of coal is accelerated by the (A) Storage in large heaps (B) Storage in compressed piles (C) Absence of porous or friable particles (D) All (A), (B) and (C)

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Which of the following factors control the deactivation of a porous catalyst pellet? (A) Decay reactions (B) Pore diffusion (C) Form of surface attack by poison (D) All (A), (B) and (C)

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For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to (A) 0 (B) 1 (C) 0.1 (D) 0.5

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A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by (A) Diffusion within the pellet (B) Reaction (C) External mass transfer (D) None of the above

Description : A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the ... A) Diffusion within the pellet (B) Reaction (C) External mass transfer (D) None of the above

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BET apparatus is used to determine the (A) Specific surface of a porous catalyst (B) Pore size distribution (C) Pore diameter (D) Porosity of the catalyst bed

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A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (ke ff) is given by (A) ke ff = k + kg (B) ke ff = (k+ kg )/2 (C) ke ff = (kkg ) 1/2 (D) 1/ke ff = 1/k + 1/kg

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For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the (A) Catalyst size is reduced or the catalyst diffusivity is reduced (B) Catalyst size is reduced or the catalyst diffusivity is increased (C) Catalyst size is increased or the catalyst diffusivity is reduced(D) Catalyst size is increased or the catalyst diffusivity is increased

Description : For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the (A) Catalyst size is reduced or the ... the catalyst diffusivity is reduced (D) Catalyst size is increased or the catalyst diffusivity is increased

Last Answer : (B) Catalyst size is reduced or the catalyst diffusivity is increased

. B.E.T. method can be used to determine the __________ of a porous catalyst. (A) Solid density (B) Pore volume (C) Surface area (D) All (A), (B) and (C)

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Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation? (A) Langmuir's assumption applies to every adsorbed layer (B) There is no dynamic equilibrium between successive layer (C) The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process (D) None of these

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Highly porous refractory bricks are (A) Less susceptible to chemical attack by molten fluxes and gases etc (B) Very strong (C) Having very high thermal conductivity (D) None of these

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Last Answer : (D) None of these

Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively (A) V2O5 & Cr2O3 . (B) Oxides of nitrogen & Cr2O3 (C) V2O5 on a porous carrier & oxides of nitrogen (D) Oxides of nitrogen & V2O5 on a porous carrier

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Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in (A) Pyrolysis of oil(B) Sintering of porous catalyst(C) Hydrogen embrittlement(D) All (A), (B) and (C)

Description : Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in (A) Pyrolysis of oil (B) Sintering of porous catalyst (C) Hydrogen embrittlement (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Shales are (A) Porous (B) Permeable (C) Porous and permeable (D) Porous but not permeable

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An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as (A) Aquifer (B) Aquiclude (C) Aquifuge (D) None of these

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Last Answer : (B) Aquiclude 

What does porous mean?

Description : What does porous mean?

Last Answer : Ans: Porous means something having sponge-like holes through which liquid or gas can seep. 

Which one of the following statements is true? (A) Clays are more porous than sands (B) Pressure of organic matter in a soil decreases the bearing capacity of the soil (C) Aluminous cement is used for foundations in soils with chemical deposits (D) All the above

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Last Answer : (D) All the above

In Joule-Thomson porous plug experiment, the (A) Enthalpy does not remain constant (B) Entire apparatus is exposed to surroundings (C) Temperature remains constant (D) None of these

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Last Answer : (D) None of these

For preparation of porous bearings by powder metallurgy, preferred particle shape is (A) Spherical (B) Nodular (C) Irregular (D) No preferred shape

Description : For preparation of porous bearings by powder metallurgy, preferred particle shape is (A) Spherical (B) Nodular (C) Irregular (D) No preferred shape

Last Answer : (A) Spherical

Segregation is responsible for (A) Honey-combed concrete (B) Porous layers in concrete (C) Surface scaling in concrete (D) All the above

Description : Segregation is responsible for (A) Honey-combed concrete (B) Porous layers in concrete (C) Surface scaling in concrete (D) All the above

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The most useless aggregate is one whose surface texture is (A) Smooth (B) Granular (C) Glassy (D) Honey combed and porous

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Non-uniform compaction may cause the concrete (A) Porous (B) Non-homogeneous (C) Reduced strength (D) All the above

Description : Non-uniform compaction may cause the concrete (A) Porous (B) Non-homogeneous (C) Reduced strength (D) All the above

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight (B) According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky (C) According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous (D) All the above

Description : Pick up the correct statement from the following: (A) According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight (B) According to ... glassy, smooth, granular, rough, crystalline, honey combed and porous (D) All the above

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) Sand obtained from pits, is washed to remove clay and silt (B) Sand obtained from flooded pits, need not be washed before use (C) The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous (D) All the above

Description : Pick up the correct statement from the following: (A) Sand obtained from pits, is washed to remove clay and silt (B) Sand obtained from flooded pits, need not be washed before use (C) The ... shore sand and shingle may cause corrosion of reinforcement if the concrete is porous (D) All the above

Last Answer : Answer: Option D

Glazing is used to make earthenware (A) Hard (B) Soft (C) Porous (D) Impervious

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Last Answer : Answer: Option D