_________ is the hardest oxide and is hence used where high wear resistance at high temperature is required. (A) Beryllium (B) Zirconia (C) Alumina (D) Magnesia

_________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
(A) Beryllium
(B) Zirconia
(C) Alumina
(D) Magnesia
by

1 Answer

Answer :

(C) Alumina
by

Related questions

Which of the following if present in iron ore, enhances its value? (A) Alumina (B) Alkali oxide (C) Lime & Magnesia (D) None of these

Description : Which of the following if present in iron ore, enhances its value? (A) Alumina (B) Alkali oxide (C) Lime & Magnesia (D) None of these

Last Answer : C) Lime & Magnesia

Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following: (A) Alumina (B) Lime (C) Iron-oxide (D) Magnesia

Description : Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following: (A) Alumina (B) Lime (C) Iron-oxide (D) Magnesia

Last Answer : Answer: Option A

Chief constituent of ordinary Portland cement is [ A ] Lime [ B ] Alumina [ C ] Magnesia [ D ] Iron oxide

Description : Chief constituent of ordinary Portland cement is [ A ] Lime [ B ] Alumina [ C ] Magnesia [ D ] Iron oxide

Last Answer : [ A ] Lime

In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet? (A) Zirconia (B) Alumina (C) Bakelite (D) Tungsten carbi

Description : In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet? (A) Zirconia (B) Alumina (C) Bakelite (D) Tungsten carbi

Last Answer : Option D

Rotary kilns in cement industry are lined with _________bricks. (A) Fireclay (B) Silica (C) Lead (D) High alumina & high magnesia

Description : Rotary kilns in cement industry are lined with _________bricks. (A) Fireclay (B) Silica (C) Lead (D) High alumina & high magnesia

Last Answer : (D) High alumina & high magnesia

Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher (A) Melting point, hence can be subjected to higher temperature (B) Density; hence core volume for a given power output would be smaller (C) Resistance to effects of irradiation (D) All (A), (B) and (C)

Description : Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher (A) Melting point, hence can be subjected to higher temperature (B) Density; hence core volume for a given ... be smaller (C) Resistance to effects of irradiation (D) All (A), (B) and (C)

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

. Which of the following is used as a catalyst in fluidised bed catalytic cracking? (A) Silica-magnesia (B) Silica-alumina (C) Bentonite clays (D) All (A), (B) and (C

Description : . Which of the following is used as a catalyst in fluidised bed catalytic cracking? (A) Silica-magnesia (B) Silica-alumina (C) Bentonite clays (D) All (A), (B) and (C

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

The refractory lining of the bottom in a basic electric arc furnace is made of (A) Silica (B) Alumina (C) Magnesia (D) Fireclay

Description : The refractory lining of the bottom in a basic electric arc furnace is made of (A) Silica (B) Alumina (C) Magnesia (D) Fireclay

Last Answer : Option C

Identify the type of soil on the basis of the given characteristics - 1. They are rich in lime, iron, magnesia and alumina. 2. They are generally clayey, deep and impermeable. 3. They are mainly found in Maharashtra, Madhya Pradesh and Gujarat. Select the correct answer from the given alternatives - a. Laterite soil b. Red and yellow soil c. Saline soil d. Black soil

Description : Identify the type of soil on the basis of the given characteristics - 1. They are rich in lime, iron, magnesia and alumina. 2. They are generally clayey, deep and impermeable. 3. They are mainly found ... the given alternatives - a. Laterite soil b. Red and yellow soil c. Saline soil d. Black soil

Last Answer : d. Black soil

The main ingredient of a good quality brick earth, is (A) Magnesia (B) Lime (C) Silica (D) Alumina

Description : The main ingredient of a good quality brick earth, is (A) Magnesia (B) Lime (C) Silica (D) Alumina

Last Answer : Answer: Option D

Which of the following ingredients of the brick earth enables the brick to retain its shape? (A) Alumina (B) Silica (C) Iron (D) Magnesia

Description : Which of the following ingredients of the brick earth enables the brick to retain its shape? (A) Alumina (B) Silica (C) Iron (D) Magnesia

Last Answer : Answer: Option B

Which of the following constituents impart plasticity to brick earth a) Alumina* b) Silica c) Lime d) Magnesia

Description : Which of the following constituents impart plasticity to brick earth a) Alumina* b) Silica c) Lime d) Magnesia

Last Answer : a) Alumina*

The main ingredients of Portland cement are a) Lime and silica* b) Lime and Alumina c) Alumina magnesia d) Silica and Alumina

Description : The main ingredients of Portland cement are a) Lime and silica* b) Lime and Alumina c) Alumina magnesia d) Silica and Alumina

Last Answer : a) Lime and silica*

Which of the following ingredients of Brick earth enables the brick to retain its shape a) Alumina b) Silica* c) Iron d) Magnesia

Description : Which of the following ingredients of Brick earth enables the brick to retain its shape a) Alumina b) Silica* c) Iron d) Magnesia

Last Answer : b) Silica*

CO2 can be absorbed by (A) Hot cupric oxide (B) Heated charcoal (C) Cold Ca(OH)2 (D) Alumina

Description : CO2 can be absorbed by (A) Hot cupric oxide (B) Heated charcoal (C) Cold Ca(OH)2 (D) Alumina

Last Answer : (B) Heated charcoal

Catalyst used in Fischer-Tropsch process is (A) Nickel (B) Zinc oxide (C) Alumina (D) Thorium oxide

Description : Catalyst used in Fischer-Tropsch process is (A) Nickel (B) Zinc oxide (C) Alumina (D) Thorium oxide

Last Answer : (A) Nickel

Catalyst used in steam reforming of naphtha is (A) Bauxite (B) Cobalt (C) Nickel oxide on alumina support (D) Chromium

Description : Catalyst used in steam reforming of naphtha is (A) Bauxite (B) Cobalt (C) Nickel oxide on alumina support (D) Chromium

Last Answer : (C) Nickel oxide on alumina support

Major component of flint glass is (A) Lead oxide (B) Silica (C) Alumina (D) Soda

Description : Major component of flint glass is (A) Lead oxide (B) Silica (C) Alumina (D) Soda

Last Answer : (A) Lead oxide

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is (A) 5CaO. 3 Al2O3 (B) 3CaO. Al2O3 (C) 3CaO. SiO2 (D) 2CaO. SiO2

Description : Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is (A) 5CaO. 3 Al2O3 (B) 3CaO. Al2O3 (C) 3CaO. SiO2 (D) 2CaO. SiO2

Last Answer : Option A

Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is (A) Alumina (B) Platinum (C) Vanadium pentoxide (D) Iron oxide

Description : Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is (A) Alumina (B) Platinum (C) Vanadium pentoxide (D) Iron oxide

Last Answer : Option B

Beryllium oxide is treated separately with aqueous HCl and aqueous NaOH solutions.

Description : Beryllium oxide is treated separately with aqueous HCl and aqueous NaOH solutions.

Last Answer : Write balanced chemical equations : Beryllium oxide is treated separately with aqueous HCl and aqueous NaOH solutions.

Pick out the wrong statement. (A) Cellulose acetate membranes are used in dialysis process (B) Elutriation process refers to when the soluble material is largely concentrated on the surface of an insoluble solid and is simply washed off by the solvent (C) 'Cascade' means a group of stages interconnected so that various streamflow from one to another(D) Zirconia probe is used for the humidity measurement

Description : Pick out the wrong statement. (A) Cellulose acetate membranes are used in dialysis process (B) Elutriation process refers to when the soluble material is largely concentrated on the surface of an ... that various streamflow from one to another (D) Zirconia probe is used for the humidity measurement

Last Answer : (D) Zirconia probe is used for the humidity measurement

Wrought iron is (A) High carbon iron (B) Highly resistance to acid corrosion (C) Malleable & ductile; and hence is used for chain links, hooks & couplings (D) An alloy of iron, chromium & carbon

Description : Wrought iron is (A) High carbon iron (B) Highly resistance to acid corrosion (C) Malleable & ductile; and hence is used for chain links, hooks & couplings (D) An alloy of iron, chromium & carbon

Last Answer : (C) Malleable & ductile; and hence is used for chain links, hooks & couplings

The ‘IC’ chips used in computers are made of (a) chromium (b) iron oxide (c) alumina (d) silicon

Description : The ‘IC’ chips used in computers are made of (a) chromium (b) iron oxide (c) alumina (d) silicon

Last Answer : Ans:(d)

The minimum percentage of chemical ingredient of cement is that of (A) Magnesium oxide (B) Iron oxide (C) Alumina (D) Lime

Description : The minimum percentage of chemical ingredient of cement is that of (A) Magnesium oxide (B) Iron oxide (C) Alumina (D) Lime

Last Answer : Answer: Option A

Efflorescence in cement is caused due to an excess of (A) Alumina (B) Iron oxide (C) Silica (D) Alkalis

Description : Efflorescence in cement is caused due to an excess of (A) Alumina (B) Iron oxide (C) Silica (D) Alkalis

Last Answer : Answer: Option D

Pick up the correct proportions of chemical ingredients of cement (A) Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3 (B) Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 (C) Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3 (D) Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

Description : Pick up the correct proportions of chemical ingredients of cement (A) Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3 (B) Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 (C) Alumina : Silica : ... oxide : 63 : 22 : 6 : 3 (D) Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

Last Answer : Answer: Option A

The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is (A) 20 (B) 15 (C) 5 (D) 0

Description : The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is (A) 20 (B) 15 (C) 5 (D) 0

Last Answer : Answer: Option D

Asbestos (A) Is a natural fibrous mineral substance (B) Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3) (C) Contains iron oxide and alumina (D) All the above

Description : Asbestos (A) Is a natural fibrous mineral substance (B) Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3) (C) Contains iron oxide and alumina (D) All the above

Last Answer : Answer: Option D

In order to provide colour, hardness and strength to the cement, the ingredient used is (a) Lime (b) Solica (c) Alumina (d) Iron oxide

Description : In order to provide colour, hardness and strength to the cement, the ingredient used is (a) Lime (b) Solica (c) Alumina (d) Iron oxide

Last Answer : (d) Iron oxide

Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly. (a) Lime (b) Silica (c) Alumina (d) Iron oxide

Description : Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly. (a) Lime (b) Silica (c) Alumina (d) Iron oxide

Last Answer : Lime is a common ingredient in cement. It is typically added in small amounts to help the cement set more quickly. Adding too much lime can cause the cement to set slowly. Alumina, silica, and iron oxide are also common ingredients in cement, but they do not have an effect on the setting time.

The proportion of lime, silica, alumina and iron oxide in a Portland cement is (a) 63:22:6:3 (b) 63:22:3:6 (c) 22:63:6:3 (d) All the above

Description : The proportion of lime, silica, alumina and iron oxide in a Portland cement is (a) 63:22:6:3 (b) 63:22:3:6 (c) 22:63:6:3 (d) All the above

Last Answer : (a) 63:22:6:3

The maximum percentage of chemical ingredient of cement is (a) Alumina (b) Iron oxide (c) Lime (d) Silica

Description : The maximum percentage of chemical ingredient of cement is (a) Alumina (b) Iron oxide (c) Lime (d) Silica

Last Answer : (c) Lime

Efflorescence in cement is caused due to an excess of [ A ] Alkalies [ B ] Silica [ C ] Iron oxide [ D ] Alumina

Description : Efflorescence in cement is caused due to an excess of [ A ] Alkalies [ B ] Silica [ C ] Iron oxide [ D ] Alumina

Last Answer : [ A ] Alkalies

White cement contains less amount of ___________ [ A ] Lime [ B ] Silica [ C ] Alumina [ D ] Iron oxide

Description : White cement contains less amount of ___________ [ A ] Lime [ B ] Silica [ C ] Alumina [ D ] Iron oxide

Last Answer : [ D ] Iron oxide

Soundness test of cement is done to determine its a) Durability in seawater b) Free lime content* c) Iron oxide content d) Alumina content

Description : Soundness test of cement is done to determine its a) Durability in seawater b) Free lime content* c) Iron oxide content d) Alumina content

Last Answer : b) Free lime content*

_________ is the hardest material out of the following. (A) Boron carbide (B) Tungsten carbide (C) Hardened steel (D) Silicon carbide

Description : _________ is the hardest material out of the following. (A) Boron carbide (B) Tungsten carbide (C) Hardened steel (D) Silicon carbide

Last Answer : (A) Boron carbide

Can jewelers easily tell the difference between zirconia and real diamonds?

Description : Can jewelers easily tell the difference between zirconia and real diamonds?

Last Answer : Most jewelers can tell the difference between zirconia and real diamonds right away.

Is it difficult to tell if a ring is cubic zirconia?

Description : Is it difficult to tell if a ring is cubic zirconia?

Last Answer : You just use a scratch test.Zirconia won't scratch glass at least not usually.It pretty mush is glass.A diamond will scratch pretty much anything.

Cubic Zirconia Shines Brighter When Embraced by Gold ?

Description : Cubic Zirconia Shines Brighter When Embraced by Gold ?

Last Answer : When looking around for gold cubic zirconia jewelry, many people are thinking not only about the amount of money they are willing to spend, but also keeping an eye on quality. The great thing ... zirconia jewelry, which not only sets a standard for great quality, but is also delightful to witness.

Which of the following is a crystalline solid? a) Copper b) NaCl c) Zirconia d) All of abovee solid? a) Copper b) NaCl c) Zirconia d) All of above

Description : Which of the following is a crystalline solid? a) Copper b) NaCl c) Zirconia d) All of above

Last Answer : d) All of above

Suicide Hackers are those _________ a) who break a system for some specific purpose with or without keeping in mind that they may suffer long term imprisonment due to their malicious activity b) individuals with no knowledge of codes but an expert in using hacking tools c) who know the consequences of their hacking activities and hence try to prevent them by erasing their digital footprints d) who are employed in an organization to do malicious activities on other firms

Description : Suicide Hackers are those _________ a) who break a system for some specific purpose with or without keeping in mind that they may suffer long term imprisonment due to their malicious activity ... digital footprints d) who are employed in an organization to do malicious activities on other firms

Last Answer : a) who break a system for some specific purpose with or without keeping in mind that they may suffer long term imprisonment due to their malicious activity

High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to (A) Flocculate the impurities(B) Facilitate fast filtration(C) Both (A) and (B)(D) Neither (A) nor (B)

Description : High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to (A) Flocculate the impurities (B) Facilitate fast filtration (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Ferric stainless steels compared to austenitic stainless steels (A) Have lower corrosion resistance (B) Are harder to fabricate (C) Are less ductile and hence less suitable for cold pressing (D) All (A), (B) and (C)

Description : Ferric stainless steels compared to austenitic stainless steels (A) Have lower corrosion resistance (B) Are harder to fabricate (C) Are less ductile and hence less suitable for cold pressing (D) All (A), (B) and (C)

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

In ammonia synthesis (N2 + 3H2 = 2NH3 ), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should becarried out at(A) Low pressure(B) High pressure(C) Very high temperature(D) Atmospheric pressure; as the pressure has no effect on conversion

Description : In ammonia synthesis (N2 + 3H2 = 2NH3 ), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should becarried out at (A) Low pressure (B) High pressure (C) Very high temperature (D) Atmospheric pressure; as the pressure has no effect on conversion

Last Answer : (B) High pressure

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude (a) people eat more nutritive food, therefore more RBCs are formed (b) people get pollution-free air to breath and more oxygen is available (c) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive (d) there is more UV radiation which enhances RBC production.

Description : People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude ... required amount of O2 to survive (d) there is more UV radiation which enhances RBC production.

Last Answer : (c) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive

The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet. (A) P, Q and R (B) P and R (C) R and S (D) P, Rand S

Description : The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet. (A) P, Q and R (B) P and R (C) R and S (D) P, Rand S

Last Answer : (A) P, Q and R

What is the element required for solar energy conversion? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon

Description : What is the element required for solar energy conversion? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon

Last Answer : (3) Silicon Explanation: The most prevalent bulk material for solar cells is crystalline silicon (abbreviated as a group as c-Si), also known as "solar grade silicon". Bulk silicon is ... into multiple categories according to crystallinity and crystal size in the resulting ingot, ribbon, or wafer.

The element required for Solar energy conversion - (1) Beryllium (2) Silicon (3) Tantalum (4) Ultra pure carbon

Description : The element required for Solar energy conversion - (1) Beryllium (2) Silicon (3) Tantalum (4) Ultra pure carbon

Last Answer : (2) Silicon Explanation: Energy conversion. n. (General Physics) is the process of changing one form of energy into another, such as nuclear energy into heat or solar energy into electrical energy.

What is the element required for solar energy conversion ---? A. Ultra pure carbon B. Silicon (Answer) C. Beryllium D. Tantalum

Description : What is the element required for solar energy conversion ---? A. Ultra pure carbon B. Silicon (Answer) C. Beryllium D. Tantalum

Last Answer : B. Silicon (Answer)