Description : The unit of specific cake resistance is (A) gm/cm2 (B) cm/gm (C) cm/gm2 (D) gm/gm
Last Answer : (A) gm/cm2 (
Description : Rapid gravity filter can only remove turbidity of water upto (A) 15 to 25 gm/litre (B) 25 to 30 gm/litre (C) 30 to 35 cm/litre (D) 35 to 40 gm/litre
Last Answer : (D) 35 to 40 gm/litre
Description : The unit of filter medium resistance is________
Last Answer : L^-1
Description : . One stoke (unit of kinematic viscosity) is equivalent to (A) 1 cm2 /second (B) 1 m2 /second (C) 1 gm/cm. second (D) 1 kg. m/second
Last Answer : (A) 1 cm2 /second
Description : One poise (unit of absolute/dynamic viscosity) is equivalent to one (A) gm/cm2 . sec (B) gm/cm. sec (C) cm2 /sec (D) m2 /sec
Last Answer : (B) gm/cm. sec
Description : Unit of viscosity in CGS system is (A) gm .cm-1 sec-1 (B) gm . cm2 . sec-2 (C) gm .cm-2, sec-1 (D) gm . cm . sec-1
Last Answer : Option A
Description : Filter medium resistance is important during the __________ of filtration. (A) Early stages (B) Final stages (C) Entire process (D) None of these
Last Answer : (A) Early stages
Description : Filter medium resistance is that offered by the (A) Filter cloth (B) Embedded particles in the septum (C) Filter cloth and the embedded particle collectively (D) None of these
Last Answer : (C) Filter cloth and the embedded particle collectively
Description : The basic filtration equation is given as dt/dV = (µ/A ∆P). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of ... produced? Neglect filter medium resistance, Rm; assume incompressible cake. (A) 10 (B) 20 (C) 25 (D) 30
Last Answer : (B) 20
Description : Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is (A) Added to the feed slurry (B) Pre ... the cake by dissolving solids or by burning it off (D) All 'a', 'b' & 'c'
Last Answer : (D) All 'a', 'b' & 'c'
Description : During the washing of cake (A) All the resistances are constant (B) Filter medium resistance increases (C) Filter medium resistance decreases (D) Cake resistance decreases
Last Answer : (A) All the resistances are constant
Description : The controlling resistance in a rotary drum vacuum filter is the __________ resistance. (A) Piping (B) Cake (C) Filter medium (D) None of these
Last Answer : (B) Cake
Description : During filtration operation, the filtrate encounters the resistance of the (A) Filter medium (B) Cake (C) Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc ) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance). (A) √μ (B) 1/√μ (C) 1/μ (D) 1/μ
Last Answer : (B) 1/√μ
Description : Slow sand filter is used if maximum turbidity of raw water is less than (A) 10 gm/litre (B) 20 gm/litre (C) 30 gm/litre (D) 50 gm/litre
Last Answer : (D) 50 gm/litre
Description : A ball weighing 250 gm is thrown vertically upwards with a velocity of 980 cm/sec. The time that the ball will take to return back to earth would be a.1 sec b.4 sec c.2 sec d.5 sec e.3 sec
Last Answer : c. 2 sec
Description : A cube of wood supporting 200 gm mass just floats in water. When the mass is removed, the cube rises by 2 cm the side of the cube will be a.5 cm b.10 cm c.12.5 cm d.20 cm e.15 cm
Last Answer : a. 5 cm
Description : One joule is the energy required to (A) Raise the temperature of 1 gm of water by 1°C (B) Raise the temperature of 1 kg of water by 1°C (C) Move a mass of 1 gm by 1 cm distance by a force of 1 Newton (D) Move a mass of 1 kg by 1 m distance by a force of 1 Newton
Last Answer : Answer : D
Description : Ordinary Portland cement requires a specific surface of [ A ] 1250 cm2/gm [ B ] 2250 cm 2/gm [ C ] 3250 cm 2/gm [ D ] 3500 cm 2/gm
Last Answer : [ B ] 2250 cm 2/gm
Description : Which of the following is not used as a filter medium in case of corrosive liquids? (A) Nylon (B) Glass cloth (C) Metal cloth of monel or stainless steel (D) Cotton fabric
Last Answer : (D) Cotton fabric
Description : Diatomaceous earth is a/an (A) Explosive (B) Filter aid (C) Filter medium (D) Catalyst
Last Answer : (B) Filter aid
Description : A compressible cake has the (A) Maximum porosity at the upstream side (B) Maximum porosity at the filter medium (C) Same porosity throughout the cake thickness (D) None of these
Last Answer : (A) Maximum porosity at the upstream side
Description : The porosity of a compressible cake is (A) Minimum at the filter medium (B) Minimum at the upstream face (C) Maximum at the filter medium (D) Same throughout the thickness of cake
Last Answer : (A) Minimum at the filter medium
Description : Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an (A) Air filter (B) Bag filter (C) Venturi scrubber (D) Hydrocyclones
Last Answer : (A) Air filter
Description : . In filtration, the use of 'filter aid' helps in (A) Reducing the filtration pressure (B) Accelerating the rate of filtration (C) Deplugging the filter medium (D) Enhancing the cake porosity in case of a dense impermeable cake
Last Answer : (C) Deplugging the filter medium
Description : Antibiotic resistance genes in gm foods -Biology
Last Answer : answer:
Description : Assertion : GM foods are facing widerspread resistance by the people Reason : GM foods hve mutated genes which cause infections and alleriges
Last Answer : Assertion : GM foods are facing widerspread resistance by the people Reason : GM foods hve mutated ... . If both the assertion and reason are false
Description : The genetically-modified (GM) brinjal in India has been developed for (a) insect-resistance (b) enhancing shelf life (c) enhancing mineral content (d) drought-resistance.
Last Answer : (a) insect-resistance
Description : Which of the following could be the unit of rotational inertia of a body in CGS system? a.cm4 b.gm-cm2 c.107 dynes d.kg-cm2 e.gm-cm4
Last Answer : b. gm-cm2
Description : Enlist the different filter medium used for filtration.
Last Answer : i) Filter paper. ii) Cotton wool. iii) Glass wool. iv) Asbestos. v) Fine muslin. vii)FilterMembranefilter. viii)Sintered glass filter.
Description : Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate) (A) S (B) 1/R (C) 1/μ (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration. (A) Rate (B) Pressure (C) Both (A) & (B) (D) Neither (A) nor (B
Last Answer : (C) Both (A) & (B)
Description : The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size). (A) c/s (B) s/c (C) s . c (D) 1/s . c
Last Answer : (A) c/s
Description : A slow sand filter is cleaned if its filter head is higher than (A) 10 cm to 20 cm (B) 20 cm to 40 cm (C) 40 cm to 70 cm (D) 70 cm to 120 cm
Last Answer : (D) 70 cm to 120 cm
Description : The specific cake resistance for compressible sludges is a function of the pressure drop (A) Over cake (B) Over medium (C) Overall (D) None of these
Last Answer : (A) Over cake
Description : Density of low density polythene is about __________ gm/c.c. (A) 0.38 (B) 0.56 (C) 0.81 (D) 0.91
Last Answer : (D) 0.91
Description : Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2 . Which of the following polymers has the maximum film elongation (of the order of 100%)? (A) Water impermeable cellophane (B) Polythene (C) Cellulose acetate (D) Teflon
Last Answer : (B) Polythene
Description : Pick out the wrong statement. (A) Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre (B) ... fibres are all prepared by wet spinning (D) Nylon fibres have greater water absorption capacity than polyester fibres
Last Answer : (C) Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning
Description : Density of high density polythene is about __________ gm/c.c. (A) 1.18 (B) 1.05 (C) 0.95 (D) 0.99
Last Answer : (C) 0.95
Description : Liquefied Petroleum Gas (LPG) in domestic use cylinders is in the liquid form. The density of LPG in liquid form is about __________ of that of water (i.e. 1 gm/c.c). (A) One fourth (B) One third (C) Half (D) One eighth
Last Answer : (C) Half
Description : The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm. (A) 1/4 (B) 1/8 (C) 1/2 (D) 1/16
Last Answer : (D) 1/16
Description : How many atoms are present in one gm-atom of an element? (A) 2 × 10 23 (B) 6 × 10 23 (C) 6 × 10 32 (D) 5 × 10 5
Last Answer : (B) 6 × 10 23
Description : If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be __________ days. (A) 5 (B) 10 (C) 20 (D) 30
Last Answer : (B) 10
Description : Molarity is defined as the number of gm moles of solute per __________ of solvent. (A) Litre (B) kg (C) gm (D) c.c
Last Answer : (A) Litre
Description : Molality is defined as the number of gm moles of solute per __________ of solvent. (A) Litre (B) gm (C) Kg (D) m
Last Answer : (C) Kg
Description : Ammonia content in raw coke oven gas is about __________ gm/Nm3 . (A) 1 (B) 5 (C) 50 (D) 100
Last Answer : (B) 5
Description : Dust content in raw blast furnace gas is about __________ gm/Nm3 ; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use. (A) 15-30 (B) 1-2 (C) 70-100 (D) 150-200
Last Answer : (A) 15-30
Description : 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 by specific gravity
Last Answer : (B) Dividing by density (gm/c.c)
Description : Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is afunction of reaction temperature. In a chemical reaction, the time required to ... Then the order of this reaction is: (A) 0 (B) 1 (C) 2 (D) 3
Last Answer : (B) 1