Heating of ore in the absence of air below its melting point is called

Heating of ore in the absence of air below its melting point is
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Calcinations
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Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting

Description : Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting

Last Answer : (2) Calcination Explanation: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of ... as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.

Heating the ore below its melting point in the absence of air I to remove volatile impuri- ties is known as?

Description : Heating the ore below its melting point in the absence of air I to remove volatile impuri- ties is known as?

Last Answer : Calcination

Heating of a ore below its melting point in the absence of air is known as (1) Refining (2) Calcination (3) Roasting (4) Smelting

Description : Heating of a ore below its melting point in the absence of air is known as (1) Refining (2) Calcination (3) Roasting (4) Smelting

Last Answer : Calcination

When ore is heated generally in absence of air then what is process called? -Do You Know?

Description : When ore is heated generally in absence of air then what is process called? -Do You Know?

Last Answer : answer:

When ore is heated generally in absence of air then what is process called?

Description : When ore is heated generally in absence of air then what is process called?

Last Answer : Calcination

When ore is heated generally in absence of air then what is process called?

Description : When ore is heated generally in absence of air then what is process called?

Last Answer : Calcination

Method of separating metals which have low melting point I from an ore is?

Description : Method of separating metals which have low melting point I from an ore is?

Last Answer : Liquation

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

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: Most of the ozone in the atmosphere is concentrated in the _____ A. Mesosphere B. Troposphere C. Stratosphere D. Ionosphere

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)

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

Description : 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

Last Answer : (B) 250-400

The strong heating of coal in absence of air is known as _______. a) destructive distillation b)refining c)combustion d)burning

Description : The strong heating of coal in absence of air is known as _______. a) destructive distillation b)refining c)combustion d)burning

Last Answer : a) destructive distillation

Charcoal is 'activated' by: w) heating it in the absence of air x) heating it in steam y) destructive distillation z) absorption

Description : Charcoal is 'activated' by: w) heating it in the absence of air x) heating it in steam y) destructive distillation z) absorption

Last Answer : ANSWER: X -- HEATING IT IN STEAM

Which of the following is NOT a means of preparing carbon dioxide? w) burning coke in the absence of air x) combustion of methane y) heating certain normal carbonates z) action of acids on carbonates

Description : Which of the following is NOT a means of preparing carbon dioxide? w) burning coke in the absence of air x) combustion of methane y) heating certain normal carbonates z) action of acids on carbonates

Last Answer : ANSWER: W -- BURNING COKE IN THE ABSENCE OF AIR 

Sulphur removal by heating of pyrite ore in presence of air is called its (A) Reduction (B) Roasting (C) Calcination (D) Smelting

Description : Sulphur removal by heating of pyrite ore in presence of air is called its (A) Reduction (B) Roasting (C) Calcination (D) Smelting

Last Answer : (B) Roasting

Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting

Description : Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting

Last Answer : (A) Roasting/reduction of ores

Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air in a reverberatory furnace to obtain th

Description : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air in a reverberatory furnace to obtain th

Last Answer : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air ... III and IV D. I , II , III and IV

Super cooling is cooling of liquid _____. (1) below melting point (2) below freezing point (3) at melting point (4) above melting point

Description : Super cooling is cooling of liquid _____. (1) below melting point (2) below freezing point (3) at melting point (4) above melting point

Last Answer : (2) below freezing point Explanation: Supercooling is the process of chilling a liquid below its freezing point, without it becoming solid.

Super cooling stands for cooling of a liquid – (1) at freezing point (2) below freezing point (3) at melting point (4) above melting point

Description : Super cooling stands for cooling of a liquid – (1) at freezing point (2) below freezing point (3) at melting point (4) above melting point

Last Answer : (2) below freezing point Explanation: Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it ... droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.

Super cooling stands for cooling of a liquid : (1) at freezing point (2) below freezing point (3) at melting point (4) above melting point

Description : Super cooling stands for cooling of a liquid : (1) at freezing point (2) below freezing point (3) at melting point (4) above melting point

Last Answer :  below freezing point

In extractive metallurgy of lead, the reduction of the roasted ore to the molten metal by heating with coke is called

Description : In extractive metallurgy of lead, the reduction of the roasted ore to the molten metal by heating with coke is called

Last Answer : In extractive metallurgy of lead, the reduction of the roasted ore to the molten metal by heating with ... B. roasting C. calcination D. None of these

Red phosphorous is changed into white phosphorous by (A) Heating in presence of light (B) Melting under pressure (C) Vaporisation followed by condensation (D) None of these

Description : Red phosphorous is changed into white phosphorous by (A) Heating in presence of light (B) Melting under pressure (C) Vaporisation followed by condensation (D) None of these

Last Answer : (C) Vaporisation followed by condensation

Which method, vapor phase oxidation or direct-melt process, transforms deposited material into a solid glass preform by heating the porous material without melting?

Description : Which method, vapor phase oxidation or direct-melt process, transforms deposited material into a solid glass preform by heating the porous material without melting?

Last Answer : Vapor phase oxidation.

Which of the following is false? a) electricity is high-grade energy b) high grade forms of energy are highly ordered and compact c) low grade energy is better used for applications like melting of metals rather than heating water for bath

Description : Which of the following is false? a) electricity is high-grade energy b) high grade forms of energy are highly ordered and compact c) low grade energy is better used for applications like melting of metals rather than heating water for bath

Last Answer : c) low grade energy is better used for applications like melting of metals rather than heating water for bath

Select the two correct statements out of the four (i – iv) statements given below about lac operon. (i) Glucose or galactose may bind with the repressor and inactivate it. (ii) In the absence of lactose, the repressor binds with the operator region. (iii)The z-gene codes for permease. (iv) This was elucidated by Francois Jacob and Jacques Monod. The correct statements are (a) (ii) and (iii) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (ii)

Description : Select the two correct statements out of the four (i - iv) statements given below about lac operon. (i) Glucose or galactose may bind with the repressor and inactivate it. (ii) In the absence of lactose, the repressor binds with the ... (iii) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (ii)

Last Answer : (c) (ii) and (iv)

Match List-I (Type of Unemployment) with List-II (Characteristics) and select the correct answer using the codes given below: L ist-I L ist -I I (Type of (Char acter ist ics) Unem ployment ) A. Seasonal I. Occurs during boom or recession in the economy B. Frictional II. An absence of demand for a certain type of workers C. Disguised III. Occurs when moving from one job to another D. Structural IV. Actual contribution by the additional labour is nil E. Cyclical V. Job opportunities during certain months in the year

Description : Match List-I (Type of Unemployment) with List-II (Characteristics) and select the correct answer using the codes given below: L ist-I L ist -I I (Type of (Char acter ist ics) Unem ... contribution by the additional labour is nil E. Cyclical V. Job opportunities during certain months in the year

Last Answer : (1) A-V, B-III, C-IV, D-II, E-I

Diamond has each of the following properties except: w) extreme hardness x) ability to conduct electricity y) high melting point z) tendency to burn in air

Description : Diamond has each of the following properties except: w) extreme hardness x) ability to conduct electricity y) high melting point z) tendency to burn in air

Last Answer : ANSWER: X -- ABILITY TO CONDUCT ELECTRICITY 

Brazing filler metal used for joining steel plates (A) Melts below the melting points of base metals (B) Melts below 300°C (C) Is copper phosphorous alloy

Description : Brazing filler metal used for joining steel plates (A) Melts below the melting points of base metals (B) Melts below 300°C (C) Is copper phosphorous alloy

Last Answer : (A) Melts below the melting points of base metals

Which of the following minerals are found in a natural way in the State of Chhattisgarh ? 1. Bauxite 2. Dolomite 3. Iron ore 4. Tin Select the correct answer using the code given below : [IAS 2008] (a) 1, 2 and 3 only (b) 1 and 3 only (c) 2 and 4 only (d) 1, 2, 3 and 4

Description : Which of the following minerals are found in a natural way in the State of Chhattisgarh ? 1. Bauxite 2. Dolomite 3. Iron ore 4. Tin Select the correct answer using the code given below : [IAS 2008] (a) 1, 2 and 3 only (b) 1 and 3 only (c) 2 and 4 only (d) 1, 2, 3 and 4

Last Answer : Ans: (d)

When the coal is heated in absence of air, it is called its (A) Deoxidation (B) Gasification (C) Coalification (D) Carbonisation

Description : When the coal is heated in absence of air, it is called its (A) Deoxidation (B) Gasification (C) Coalification (D) Carbonisation

Last Answer : (D) Carbonisation

Dew point can be best defined as the: a. Absolute temperature at which air, upon heating, will evaporate moisture b. . Percentage of moisture that air can hold at a given temperature and pressure c. . Temperature that air will begin to evaporate moisture d. . Temperature at which air, upon cooling, becomes saturated, causing moisture to condense should the temperature drop further e. . Atmospheric pressure at which air will condense moisture

Description : Dew point can be best defined as the: a. Absolute temperature at which air, upon heating, will evaporate moisture b. . Percentage of moisture that air can hold at a given temperature ... to condense should the temperature drop further e. . Atmospheric pressure at which air will condense moisture

Last Answer : Answer: D

Air at a particular humidity is heated in a furnace. The new dew point (A) Decreases (B) Increases (C) Depends on the extent of heating (D) Remain unchanged

Description : Air at a particular humidity is heated in a furnace. The new dew point (A) Decreases (B) Increases (C) Depends on the extent of heating (D) Remain unchanged

Last Answer : (B) Increases

Pick out the wrong statement. (A) Economy of a multiple effect evaporator is not influenced by the boiling point elevation (B) Two identical cubes of iron and copper will have the same heat content under the same conditions of temperature (C) Double pipe heat exchangers are mostly used in the field of refrigeration (D) Finned tube heat exchangers are suitable for heating air by steam

Description : Pick out the wrong statement. (A) Economy of a multiple effect evaporator is not influenced by the boiling point elevation (B) Two identical cubes of iron and copper will have the same heat ... in the field of refrigeration (D) Finned tube heat exchangers are suitable for heating air by steam

Last Answer : (B) Two identical cubes of iron and copper will have the same heat content under the same conditions of temperature

During sensible heating of humid air (A) Relative humidity increases (B) Dew point remains constant (C) Dry bulb & wet bulb temperature increases (D) Both 'b' & 'c'

Description : During sensible heating of humid air (A) Relative humidity increases (B) Dew point remains constant (C) Dry bulb & wet bulb temperature increases (D) Both 'b' & 'c'

Last Answer : (D) Both 'b' & 'c'

Respiration in the absence of air is called - (1) Aerobic respiration (2) Anaerobic respiration (3) Muscular respiration (4) Molecular respiration

Description : Respiration in the absence of air is called - (1) Aerobic respiration (2) Anaerobic respiration (3) Muscular respiration (4) Molecular respiration

Last Answer : (2) Anaerobic respiration Explanation: Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.

The process of chemical decomposition at high temperature (upto 5000 C) in total or partial absence of air is called

Description : The process of chemical decomposition at high temperature (upto 5000 C) in total or partial absence of air is called

Last Answer : combustion pyrolysis.

The thermal decomposition of alkanes in the absence of air is called : (a) Combustion (b) Oxidation (c) Cracking (d) Hydrogenation

Description : The thermal decomposition of alkanes in the absence of air is called : (a) Combustion (b) Oxidation (c) Cracking (d) Hydrogenation

Last Answer : Cracking

In the heating process of the ________type a simple method of temperature control is possible by means of a special alloy which loses its magnetic properties at a particular high temperature and regains them when cooled to a temperature below this value. (A) Indirect induction over (B) core type induction furnace (C) coreless induction furnace (D) high frequency eddy current

Description : In the heating process of the ________type a simple method of temperature control is possible by means of a special alloy which loses its magnetic properties at a particular high temperature and regains ... ) core type induction furnace (C) coreless induction furnace (D) high frequency eddy current

Last Answer : Ans: D Magnetic property of alloy changes with change of the temperature and Heat is produced due to eddy current = i2R and i α f2

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

Description : 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

Last Answer : (C) 950

In a PIN diode, leakage current in the absence of light is called: a. baseline current b. zero-point current c. dark current d. E-H current

Description : In a PIN diode, leakage current in the absence of light is called: a. baseline current b. zero-point current c. dark current d. E-H current

Last Answer : c. dark current

The atmosphere near the earth’s surface is “heated from below.” Which of the following does not significantly contribute to this heating -----------? A. Conduction of heat upward from a hot surface B. Convection from a hot surface C. Absorption of infrared energy that has been radiated from the surface D. Heat energy from the earth’s interior (Answer)

Description : The atmosphere near the earth's surface is heated from below. Which of the following does not significantly contribute to this heating -----------? A. Conduction of heat upward from a ... infrared energy that has been radiated from the surface D. Heat energy from the earth's interior (Answer)

Last Answer : D. Heat energy from the earth’s interior (Answer)

f the temperature falls below 18 degrees, the heating is switched on. When the temperature reaches 21 degrees, the heating is switched off. What is the minimum set of test input values to cover all valid equivalence partitions? A. 15, 19 and 25 degrees B. 17, 18, 20 and 21 degrees C. 18, 20 and 22 degrees D. 16 and 26 degrees

Description : f the temperature falls below 18 degrees, the heating is switched on. When the temperature reaches 21 degrees, the heating is switched off. What is the minimum set of test input values to cover all valid equivalence ... 17, 18, 20 and 21 degrees C. 18, 20 and 22 degrees D. 16 and 26 degrees

Last Answer : A. 15, 19 and 25 degrees

A thermometer measures temperature in whole degrees only. If the temperature falls below 18 degrees, the heating is switched off. It is switched on again when the temperature reaches 21 degrees. What are the best values in degrees to cover all equivalence partitions? A. 15,19 and 25. B. 17,18 and19. C. 18, 20 and22. D. 16, 26 and 32.

Description : A thermometer measures temperature in whole degrees only. If the temperature falls below 18 degrees, the heating is switched off. It is switched on again when the temperature reaches 21 degrees. What are the best values in degrees to ... and 25. B. 17,18 and19. C. 18, 20 and22. D. 16, 26 and 32.

Last Answer : A. 15,19 and 25.

What is formed when white phosphorus is heated at 540 K in the absence of air? -Do You Know?

Description : What is formed when white phosphorus is heated at 540 K in the absence of air? -Do You Know?

Last Answer : answer:

What happens when sulphur is heated in absence of air?

Description : What happens when sulphur is heated in absence of air?

Last Answer : Sulfur is melted.

What is formed when white phosphorus is heated at 540 K in the absence of air?

Description : What is formed when white phosphorus is heated at 540 K in the absence of air?

Last Answer : Red phosphorus

Which substance is obtained when coal is heated in the absence of air?

Description : Which substance is obtained when coal is heated in the absence of air?

Last Answer : Coke

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

Fermentation is adversely affected by the (A) Presence of air (B) Absence of air (C) High concentration (D) Presence of ammonium salts

Description : Fermentation is adversely affected by the (A) Presence of air (B) Absence of air (C) High concentration (D) Presence of ammonium salts

Last Answer : (C) High concentration