Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity.

Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity.
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Assertion : Zone refining method is very useful for producing semiconductors. Reason : Semiconductors are of high purity.
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Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure metal.

Description : Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure metal.

Last Answer : Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure ... Statement-1 is false but Statement -2 is true

The method of zone refining of metals is based on the principle of :

Description : The method of zone refining of metals is based on the principle of :

Last Answer : The method of zone refining of metals is based on the principle of : A. Greater mobility of the ... the impurity in the molten state than in the solid

Zone refining is a method to obtain

Description : Zone refining is a method to obtain

Last Answer : Zone refining is a method to obtain A. very high temperature B. ultra pure Al C. ultra pure metals D. ultra pure oxides

Zone refining method is used for refining

Description : Zone refining method is used for refining

Last Answer : Zone refining method is used for refining A. Al B. Ge C. Cu D. Fe

Explain the process of zone refining. Name one metal refined by this method.

Description : Explain the process of zone refining. Name one metal refined by this method.

Last Answer : The apparatus used for zone refining consists of a circular heater fitted around the rod of impure metal at one end. The circular heater is slowly moved to the other end. At the heated zone, ... in solid metal passes into the adjacent molten part. A metal refined by zone refining is germanium.

Assertion : The mammary glands of the female starts producing milk just after the process of parturition . Reason : High level of oxytocin induces mil

Description : Assertion : The mammary glands of the female starts producing milk just after the process of parturition . Reason : High level of oxytocin induces mil

Last Answer : Assertion : The mammary glands of the female starts producing milk just after the process of parturition ... D. If both Assertion & Reason are False.

Zone refining is based on the principle of

Description : Zone refining is based on the principle of

Last Answer : Zone refining is based on the principle of A. fractional distillation B. fractional ... C. partition coefficent D. chromatographic seperation

Zone refining is based on the principle that

Description : Zone refining is based on the principle that

Last Answer : Zone refining is based on the principle that A. impurities of low boiling metals can be ... volatile compound can be decomppose in pure metal.

Copper is refined by - (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Description : Copper is refined by - (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Last Answer : (1) roasting Explanation: Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ... ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.

The ultrapure metal is obtained by - (1) Calcination (2) Sublimation (3) zone refining (4) None of these

Description : The ultrapure metal is obtained by - (1) Calcination (2) Sublimation (3) zone refining (4) None of these

Last Answer : (3) zone refining Explanation: The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.

Zone refining is used for the purification of?

Description : Zone refining is used for the purification of?

Last Answer : Ge

What is meant by zone refining or fractional crystallization?

Description : What is meant by zone refining or fractional crystallization?

Last Answer : Zone refining is a technique of obtaining ultra pure metal. It is based on the principle of differences in solubility of impurities in liquid and solid states of the metal.

What is the Principle of Zone refining ?

Description : What is the Principle of Zone refining ?

Last Answer : Ans. : When the molten solution of an impure metal is allowed to cool, the pure metal crystallizes out while the impurities remains in the solution.

By which process copper is refined ------? A. Roasting (Answer) B. Oxidation C. Zone Refining D. Electrolysis

Description : By which process copper is refined ------? A. Roasting (Answer) B. Oxidation C. Zone Refining D. Electrolysis

Last Answer : A. Roasting (Answer)

Copper is refined by (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Description : Copper is refined by (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Last Answer : roasting

Flash distillation is (A) Same as differential distillation (B) Used for multi-component systems like crude refining (C) Same as simple distillation (D) Most useful for handling binary systems

Description : Flash distillation is (A) Same as differential distillation (B) Used for multi-component systems like crude refining (C) Same as simple distillation (D) Most useful for handling binary systems

Last Answer : (B) Used for multi-component systems like crude refining

What cross is useful in determining the genetic purity of gametes? Show with an example.

Description : What cross is useful in determining the genetic purity of gametes? Show with an example.  

Last Answer : Ans: Test cross. If it is done between an individual with Tt genotype and the recessive parent with tt genotype, 50% of the individuals obtained will be tall and the remaining are dwarf. 

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)

Description : 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 ... by the generation of heat (C) Electrolytically dissociate alumina (D) Both (B) & (C)

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

Assertion: Intermolecular dehydration is not useful for the perparation of unsymmetrical ethers from primary alcohols Reason: The reaction leads to a

Description : Assertion: Intermolecular dehydration is not useful for the perparation of unsymmetrical ethers from primary alcohols Reason: The reaction leads to a

Last Answer : Assertion: Intermolecular dehydration is not useful for the perparation of unsymmetrical ethers from primary ... . Assertion is false, Reason is true

Assertion(A): Per capita Income is not a useful criterion and should not be used as measure of development. Reason( R) :Kerala with lower per capita income has a better human development ranking than Haryana. a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true and R is the not correct explanation of A. c) A is correct but R is wrong. d) A is wrong but R is correct.

Description : Assertion(A): Per capita Income is not a useful criterion and should not be used as measure of development. Reason( R) :Kerala with lower per capita income has a better human development ranking than Haryana. a) Both A ... of A. c) A is correct but R is wrong. d) A is wrong but R is correct.

Last Answer : b) Both A and R are true and R is the not correct explanation of A.

Assertion (A): Learning is a life long process. Reason (R): Learning to be useful must be linked with life processes. Choose the correct Answer from the following code (A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true.

Description : Assertion (A): Learning is a life long process. Reason (R): Learning to be useful must be linked with life processes. Choose the correct Answer from the following code (A) Both (A) and (R) are true and (R) is the correct ... (C) (A) is true, but (R) is false (D) (A) is false, but (R) is true.

Last Answer : Answer: B

Give reason: a) 14th group electrons are semiconductors except carbon.

Description : Give reason: a) 14th group electrons are semiconductors except carbon.

Last Answer : a) 14th group electrons are semiconductors except carbon.The valence electrons have a low energy that they cannot become free by absorbingnormal energy from the surroundings. b) Silicon is ... same 4 valence electrons but silicon can be used at highertemperatures, cheaper and abundantly available.

What is the reason for the conductivity of semiconductors?

Description : What is the reason for the conductivity of semiconductors?

Last Answer : Semiconductors require a small amount of energy to break the covalent bond to set theelectron free. Thus as the temperature increases, the number of electrons dissociatedfrom their atoms increases. Thus semiconductors behave as conductors.

Czochralski method is widely used for the growth of crystal of -------------materials. a) Conductors b) semiconductors c) insulator d) conductors & insulators

Description : Czochralski method is widely used for the growth of crystal of -------------materials. a) Conductors b) semiconductors c) insulator d) conductors & insulators

Last Answer : b) semiconductors

Ultrapure elements are obtained in the following method of mental refining

Description : Ultrapure elements are obtained in the following method of mental refining

Last Answer : Ultrapure elements are obtained in the following method of mental refining A. Electrolysis B. Poling C. Liquation D. Distallation

Assertion : From day 10 to 17 of the mentrual cycle is called fertile period. Reason : As chances of fertilisation are very high during this period.

Description : Assertion : From day 10 to 17 of the mentrual cycle is called fertile period. Reason : As chances of fertilisation are very high during this period.

Last Answer : Assertion : From day 10 to 17 of the mentrual cycle is called fertile period. Reason : As chances of ... . D. If both Assertion & Reason are False.

Which approach is used for refining a very general rule through ILP? a) Top-down approach b) Bottom-up approach c) Both Top-down & Bottom-up approach d) None of the mentioned

Description : Which approach is used for refining a very general rule through ILP? a) Top-down approach b) Bottom-up approach c) Both Top-down & Bottom-up approach d) None of the mentioned

Last Answer : a) Top-down approach

In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process (A) Uses lower grade phosphate rock (B) Requires lower capital investment in the plant(C) Produces lower purity acid(D) Is very costly

Description : In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process (A) Uses lower grade phosphate rock (B) Requires lower capital investment in the plant (C) Produces lower purity acid (D) Is very costly

Last Answer : (C) Produces lower purity acid

Assertion `:-` Haemodialysis method is used in case of kidney failure. Reason `:-` Malfunctioning of kidney leads to uremia.

Description : Assertion `:-` Haemodialysis method is used in case of kidney failure. Reason `:-` Malfunctioning of kidney leads to uremia.

Last Answer : Assertion `:-` Haemodialysis method is used in case of kidney failure. Reason `:-` Malfunctioning of ... . D. If both Assertion & Reason are false.

Assertion : Vasectomy is considered in permanent sterilisation method in male . Reason : It show immediate sterilisation after procedure .

Description : Assertion : Vasectomy is considered in permanent sterilisation method in male . Reason : It show immediate sterilisation after procedure .

Last Answer : Assertion : Vasectomy is considered in permanent sterilisation method in male . Reason : It show immediate ... . If both Assertion & Reason are False.

Assertion: Ecological sanitation is a sustainable system for handling human excreta. Reason: It is a practical and hygienic method of using dry compos

Description : Assertion: Ecological sanitation is a sustainable system for handling human excreta. Reason: It is a practical and hygienic method of using dry compos

Last Answer : Assertion: Ecological sanitation is a sustainable system for handling human excreta. Reason: It is a ... and Reason are false, then mark (4).

Assertion :- In plant cells cell plate method is found for cytokinesis instead of cell furrow method. Reason :- Plant cells are enclosed by a relative

Description : Assertion :- In plant cells cell plate method is found for cytokinesis instead of cell furrow method. Reason :- Plant cells are enclosed by a relative

Last Answer : Assertion :- In plant cells cell plate method is found for cytokinesis instead of cell furrow method. ... D. If both Assertion & Reason are false.

Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method

Description : Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method

Last Answer : Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method

Assertion : Zirconium can be purificed by Van Arkel method. Reason : `ZrI_(4)` is volatile and decomposed at `1800 K`.

Description : Assertion : Zirconium can be purificed by Van Arkel method. Reason : `ZrI_(4)` is volatile and decomposed at `1800 K`.

Last Answer : Assertion : Zirconium can be purificed by Van Arkel method. Reason : `ZrI_(4)` is volatile and decomposed at `1800 K`.

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion: Fast decoupled load flow method gives approximate load flow solution because it uses several assumptions. Reason: Accuracy depends on the power mismatch vector tolerance. a) Both [a] and [r] are true and [r] is the correct reason for [a]. b) Both [a] and [r] are true and [r] is not the correct reason for [a]. c) [a] is false and [r] is true.

Description : Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion: Fast decoupled load flow method gives approximate load flow solution because it uses several assumptions. Reason: Accuracy ... the correct reason for [a]. c) [a] is false and [r] is true.

Last Answer : c) [a] is false and [r] is true

Assertion `:-` In cortical nephrone, the loop of Henle is too short and extends only very little into medulla. Reason `:-` Vasa recta is absent or hig

Description : Assertion `:-` In cortical nephrone, the loop of Henle is too short and extends only very little into medulla. Reason `:-` Vasa recta is absent or hig

Last Answer : Assertion `:-` In cortical nephrone, the loop of Henle is too short and extends only very little into ... . D. If both Assertion & Reason are false.

Assertion `:-` Small intestine is very long and has plica circularis & villi Reason `:` All these increase internal surface area of small intestine fo

Description : Assertion `:-` Small intestine is very long and has plica circularis & villi Reason `:` All these increase internal surface area of small intestine fo

Last Answer : Assertion `:-` Small intestine is very long and has plica circularis & villi Reason `:` All these ... False. D. If both Assertion & Reason are false.

Assertion :- The geologcial histroy of earth closely correlates with the biological history of earth. Reason :- Earth is very old.

Description : Assertion :- The geologcial histroy of earth closely correlates with the biological history of earth. Reason :- Earth is very old.

Last Answer : Assertion :- The geologcial histroy of earth closely correlates with the biological history of earth. ... . If both Assertion & Reason are false.

Assertion (A) : Inhabitants close to very busy airports are likely to experience health hazards. Reason (R) : Sound level of jet aeroplanes usually ex

Description : Assertion (A) : Inhabitants close to very busy airports are likely to experience health hazards. Reason (R) : Sound level of jet aeroplanes usually ex

Last Answer : Assertion (A) : Inhabitants close to very busy airports are likely to experience health hazards. Reason ... but reason is wrong D. Both are wrong

Assertion : New Born baby is resistant for cold Reason : The immune system of new born baby is very well developed .

Description : Assertion : New Born baby is resistant for cold Reason : The immune system of new born baby is very well developed .

Last Answer : Assertion : New Born baby is resistant for cold Reason : The immune system of new born baby is very ... . D. If both Assertion & Reason are false.

Assertion : Use of fertilizers greatly enhaces crop productivity. Reason : Irrigation is very important in increasing crop productivity.

Description : Assertion : Use of fertilizers greatly enhaces crop productivity. Reason : Irrigation is very important in increasing crop productivity.

Last Answer : Assertion : Use of fertilizers greatly enhaces crop productivity. Reason : Irrigation is very important ... D. If both assertion and reason are false

Assertion (A). Industrial policy 1991 initiated liberalisation of Indian economy. Reason (R). Industrial growth was very slow before 1991. A. Both (A) and (R) are true and (R) is the correct explanation of (A). B. Both (A) and (R) are true but (R) is not the correct explanation of (A). C. (A) is true but (R) is false. D. (A) is false but (R) is true.

Description : Assertion (A). Industrial policy 1991 initiated liberalisation of Indian economy. Reason (R). Industrial growth was very slow before 1991. A. Both (A) and (R) are true and (R) is the correct explanation of (A). B. Both (A) ... A). C. (A) is true but (R) is false. D. (A) is false but (R) is true.

Last Answer : A. Both (A) and (R) are true and (R) is the correct explanation of (A). B. Both

Dielectric constant will be high in a) Conductors b) Semiconductors c) Insulators d) Superconductors

Description : Dielectric constant will be high in a) Conductors b) Semiconductors c) Insulators d) Superconductors

Last Answer : c) Insulators

The process of producing useful information for the user is called ___________ a) Controlling b) Outputting c) Inputting d) Processing

Description : The process of producing useful information for the user is called ___________ a) Controlling b) Outputting c) Inputting d) Processing

Last Answer : Answer: b Explanation: The Output Unit is responsible for giving the results to the user in the form of a printed report or visual display. The process is referred to as ... . Inputting means giving instructions to the system whereas, processing means performing certain operations and calculations

Outbreeding is an important strategy of animal husbandry because it(a) is useful in overcoming inbreeding depression (b) exposes harmful recessive genes that are eliminated by selection (c) helps in accumulation of superior genes (d) is useful in producing purelines of animals.

Description : Outbreeding is an important strategy of animal husbandry because it (a) is useful in overcoming inbreeding depression (b) exposes harmful recessive genes that are eliminated by selection (c) helps in accumulation of superior genes (d) is useful in producing purelines of animals.

Last Answer : (a) is useful in overcoming inbreeding depression

what are high purity products?

Description : what are high purity products?

Last Answer : AMETEK FPP is one of the Trusted providers of High Purity Products which are prevalent in Semiconductor Fabs, pharmaceutical plants, high purity liquids.AMETEK fluoropolymer heat exchangers offer an ... or use dilute sulfuric acid, nitric acid, and hydrochloric acid or produce electronics chemicals.

High purity copper metal is obtained by

Description : High purity copper metal is obtained by

Last Answer : High purity copper metal is obtained by A. carbone reduction B. Hydrogen reduction C. ... from Bessomer converter is called as blister copper.