Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air. (A) 50-80 (B) 250-400 (C) 1000-1200 (D) 800-900

Conversion of yellow phosphorous to red phosphorous is done by
heating it in covered retorts at __________ °C in absence of air.
(A) 50-80
(B) 250-400
(C) 1000-1200
(D) 800-900
by

1 Answer

Answer :

(B) 250-400
by

Related questions

Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the (A) Presence of an inert atmosphere (B) Presence of a reducing atmosphere (C) Absence of air (D) Presence of an oxidising atmosphere

Description : Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the (A) Presence of an inert atmosphere (B) Presence of a reducing atmosphere (C) Absence of air (D) Presence of an oxidising atmosphere

Last Answer : (C) Absence of air

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C. (A) 400-500 (B) 900-1000 (C) 1400-1500 (D) 1700-1800

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Last Answer : (B) 900-1000

Coke is made by heating coal in the absence of air at: A. 700 °C B. 1300 °C C. 900 °C D. 1700 °C ANSWER: Why are soft drinks made with chilled water rather than water at room temperature? A. Ingredients dissolve better in chilled water B. Chilled water enhances the taste C. Chilled water attracts more carbon dioxide D. Chilled water is more hygienic

Description : Coke is made by heating coal in the absence of air at: A. 700 °C B. 1300 °C C. 900 °C D. 1700 °C ANSWER: Why are soft drinks made with chilled water rather than water at room ... B. Chilled water enhances the taste C. Chilled water attracts more carbon dioxide D. Chilled water is more hygienic

Last Answer : ANSWER: C

Coke is made by heating coal in the absence of air at: A. 700 °C B. 1300 °C C. 900 °C D. 1700 °C ANSWER: Most of the ozone in the atmosphere is concentrated in the _____ A. Mesosphere B. Troposphere C. Stratosphere D. Ionosphere

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Last Answer : ANSWER: C

Coke is made by heating coal in the absence of air at-----? A. 700 °C B. 900 °C C. 1300 °C (Answer) D. 1700 °C

Description : Coke is made by heating coal in the absence of air at-----? A. 700 °C B. 900 °C C. 1300 °C (Answer) D. 1700 °C

Last Answer : C. 1300 °C (Answer)

Electrolytic reduction cell used for conversion of calcined Al2O3to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to (A) Achieve very high purity of aluminium (99.9%) (B) Keep the electrolyte in liquid condition by the generation of heat (C) Electrolytically dissociate alumina (D) Both (B) & (C)

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Last Answer : (D) Both (B) & (C)

Temperature attained in soldering of metals is about __________ °C. (A) 150-300 (B) 400-500 (C) 650-800 (D) 1000-1100

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Last Answer : (A) 150-300

Daily requirement of phosphorous for an infant is (A) 240–400 mg (B) 1.2 gms (C) 800 mg (D) 800–1200 mg

Description : Daily requirement of phosphorous for an infant is (A) 240–400 mg (B) 1.2 gms (C) 800 mg (D) 800–1200 mg

Last Answer : Answer : A

Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C. (A) 80-120 (B) 200-300 (C) 600-800 (D) 1000-1100

Description : Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C. (A) 80-120 (B) 200-300 (C) 600-800 (D) 1000-1100

Last Answer : (D) 1000-1100

Hot extrusion of aluminium is done in the temperature range of __________ °C. (A) 550-600 (B) 450-500 (C) 350-400 (D) 250-300

Description : Hot extrusion of aluminium is done in the temperature range of __________ °C. (A) 550-600 (B) 450-500 (C) 350-400 (D) 250-300

Last Answer : (C) 350-400

Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C. (A) 250-300 (B) 500-750 (C) 950-1050 (D) 1400-1450

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Last Answer : (D) 1400-1450

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Last Answer : a) 400 – 550 rpm

For protection of level crossing gate in an emergency on BG double line the Gateman should place one detonator at one place and 3 detonators at a subsequent place at a distance of ------- a) and------- meters respectively b) 400 meters in 800 meters c) 500 meters and 1000 meters d) 600 meters and 1200 meters* e) 800 meters in 1500 meters

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Last Answer : c) 600 meters and 1200 meter *

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Description : Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C. (A) 250 (B) 650 (C) 850 (D) 1000

Last Answer : (B) 650

The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2 /m3 ) (A) 500 (B) 1200 (C) 900 (D) 800

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Last Answer : (A) 500

Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C. (A) 80 (B) 130 (C) 180 (D) 250

Description : Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C. (A) 80 (B) 130 (C) 180 (D) 250

Last Answer : (B) 130

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Last Answer : (A) 80-170

Molecular sieves are regenerated by heating to __________ °C. (A) < 150 (B) 200-330 (C) > 500 (D) > 1000

Description : Molecular sieves are regenerated by heating to __________ °C. (A) < 150 (B) 200-330 (C) > 500 (D) > 1000

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Last Answer : 7.9 °C

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Last Answer : (D) 800

The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2 . The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10 -8 W/m2 .K4 )(A) 1000(B) 727(C) 800(D) 1200

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Last Answer : (A) 1000

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Last Answer : (D) 250-280

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Description : Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C. (A) 25 (B) 60-70 (C) 150-200 (D) 250-300

Last Answer : (B) 60-70

Fermentation of molasses to produce ethyl alcohol is done at __________ °C. (A) 20 - 30 (B) < - 5 (C) 100 - 150 (D) 250 - 300

Description : Fermentation of molasses to produce ethyl alcohol is done at __________ °C. (A) 20 - 30 (B) < - 5 (C) 100 - 150 (D) 250 - 300

Last Answer : (A) 20 - 30

17. The brain capacity of Neanderthal man is--- (a) 1400 cc (b) 900 cc (c) 650-800 cc (d) 400-500 cc

Description : 17. The brain capacity of Neanderthal man is--- (a) 1400 cc (b) 900 cc (c) 650-800 cc (d) 400-500 cc

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The cutter bar of a tractor operated on owner makes strokes/min (a) 400 – 500 (b) 500 – 750 (c) 800 – 1200 (d) 1250 – 1500

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Last Answer : (c) 800 – 1200

Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximateanalysis.(A) 550(B) 750(C) 950(D) 1150

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Last Answer : (C) 950

Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute). (A) 5-10 (B) 30-80 (C) 150-250 (D) 350-400

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Last Answer : (B) 30-80

P and Q undertake to do a piece of job for Rs.1200. P alone can do it in 12 days while Q alone can do it in 16 days. With the help of R , they finish it in 6 days. Find the share of P,Q & R. a) 400,600,200 b) 200,400,600 c) 450,400,250 d) 600,450,150

Description :  P and Q undertake to do a piece of job for Rs.1200. P alone can do it in 12 days while Q alone can do it in 16 days. With the help of R , they finish it in 6 days. Find the share of P,Q & R. a) 400,600,200 b) 200,400,600 c) 450,400,250 d) 600,450,150

Last Answer : D R;s 1 day work = 1/6 – (1/12 + 1/16) =1/6 – 1/12 – 1/16 = (8-4-3)/48 = 1/48 P:Q:R = ratio of 1 day work = 1/12:1/16 : 1/48 =4:3:1 P’s share = Rs(1200*4/8) =Rs.600 Q’s share = Rs(1200 * 3/8) =Rs.450 R’s share = Rs(1200 * 1/8) =Rs.150

Payments bank of the postal department will have how much corpus at the beginning? A) Rs 900 crore B) Rs 600 crore C) Rs 1000 crore D) Rs 800 crore E) Rs 700 crore

Description : Payments bank of the postal department will have how much corpus at the beginning? A) Rs 900 crore B) Rs 600 crore C) Rs 1000 crore D) Rs 800 crore E) Rs 700 crore

Last Answer : D) Rs 800 crore Explanation: The payments bank of eth department will be functional by March 2017. It is one of the 11 applicants which got in principle approval to set up payments bank in the country.

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Description : Seven men, five women and eight children were given as assignment of distributing 2000 books to students in a school over a period of three days. All of them distributed books on the first day. One of the second ... distributed on the second day? a) 1000 b) 800 c) 650 d) 900 e) Cannot be determined

Last Answer : Answer: C Sol. Let the books distributed by man, a woman and a child be 5x, 4x and 2x respectively. ∴ No. of books distributed in 1st day = 7 5x+5 4x+8 2x=71x No. of books distributed in 2nd day =7 ... 2x=46x 71x + 57x + 46x = 2000, x = 2000/174 57x=2000/174 57= 655 650 (Approx)

Check supervisor in RMS the standard for test sorting will be a) 500 article per hour b) 800 article per hour c) 1000 article per hour d) 1200 article per hour

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Last Answer : a) 500 article per hour

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Description : Production at 60% activity is Rs 600 units, if flexible budget needs to be calculated at 80% activity what will be units produced? a) Rs 800 b) Rs 600 c) Rs 1200 d) Rs 1000

Last Answer : a) Rs 800

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Description : rank speed on the mower with conventional pit man drive is a)850-1000 rpm b)1000-1200rpm c)800-1150rpm d)1200-1600 rpm

Last Answer : a)850-1000 rpm

High speed steel tools retain their hardness upto a temperature of __________ °C.(A) 500 (B) 750 (C) 900 (D) 1100

Description : High speed steel tools retain their hardness upto a temperature of __________ °C. (A) 500 (B) 750 (C) 900 (D) 1100

Last Answer : (C) 900

Low temperature carbonisation of coal takes place at __________ °C. (A) 300 (B) 1100 (C) 700 (D) 900

Description : Low temperature carbonisation of coal takes place at __________ °C. (A) 300 (B) 1100 (C) 700 (D) 900

Last Answer : (C) 700

High speed steel tools retain their hardness upto a temperature of __________ °C. (A) 500 (B) 750 (C) 900 (D) 1100

Description : High speed steel tools retain their hardness upto a temperature of __________ °C. (A) 500 (B) 750 (C) 900 (D) 1100

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Hydrogen content in petroleum products varies from 12 to 15% (by weight). As a result the difference between gross and net heating value of petroleum fuels varies in the range of __________ kcal/kg. (A) 600-750 (B) 250-350 (C) 1000-1500 (D) 2000-2500

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Last Answer : (A) 600-750

Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C. (A) -5 to 0 (B) 5 to 10 (C) 30 to 50 (D) 75 to 80

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Last Answer : (A) 32

A father runs after his son, who is 1000 meters ahead. The father runs at a speed of 1 kilometre every 8 minutes, and the son runs at a speed of 1 kilometer every 12 minutes. How much distance has the son covered at the point when the father overtakes him? a) 2500 meters b) 2000 meters c) 1500 meters d) 1000 meters e) 1200 meters

Description : A father runs after his son, who is 1000 meters ahead. The father runs at a speed of 1 kilometre every 8 minutes, and the son runs at a speed of 1 kilometer every 12 minutes. How much distance has ... father overtakes him? a) 2500 meters b) 2000 meters c) 1500 meters d) 1000 meters e) 1200 meters

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If the bit rate for a16-QAM signal is 4000 bps, what is the baudrate? A) 300 B) 400 C) 1000 D) 1200

Description : If the bit rate for a16-QAM signal is 4000 bps, what is the baudrate? A) 300 B) 400 C) 1000 D) 1200

Last Answer : 1000

Number of meiotic divisions required to produce 200/400 seeds of pea would be (a) 200/400 (b) 400/800 (c) 300/600 (d) 250/500

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Last Answer : (B) 1 and 200

Which rate is the greatest 800 miles per 16 hours 1500 miles per 50 hours 600 miles per 15 hours or 900 miles per 20 hours?

Description : Which rate is the greatest 800 miles per 16 hours 1500 miles per 50 hours 600 miles per 15 hours or 900 miles per 20 hours?

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Last Answer : (B) Black

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Description : Feed water usually at…… °C temperature. a) 70 b) 120 c) 1000 d) 80

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Last Answer : (C) 250-280