Description : __________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant. (A) Pyrex (B) Soda lime (C) Lead (D) High silica
Last Answer : (A) Pyrex
Description : Type of glass used in optical work is the __________ glass. (A) Soda-lime (B) Fibre (C) Lead (D) Borosilicate
Last Answer : (C) Lead
Description : Laboratory glass wares which reacts with hydrofluoric acid, are made of the __________ glass. (A) Lead (B) Borosilicate (C) Soda lime (D) Alkali silicate
Last Answer : (B) Borosilicate
Description : Which glass is usually used in optical work? (A) Lead glass (B) High silica (borosilicate) glass (C) Photo-sensitive glass (D) Fibre glass
Last Answer : (C) Photo-sensitive glass
Description : __________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C. (A) Borosilicate (B) High silica (C) Supermax (D) Lead
Last Answer : (C) Supermax
Description : The major constituents of glass are (A) Lime, clay and soda ash (B) Sand, lime and soda ash (C) Silica, alumina and clay (D) Silica, alumina and soda ash
Last Answer : (B) Sand, lime and soda ash
Description : Pick out the wrong statement. (A) High early strength cement are made from materials having high silica to lime ratio (B) The function of gypsum in cement is to enhance its initial ... cements are known as silicate cement (D) Major component of greyish Portland cement is tricalcium silicate
Last Answer : (A) High early strength cement are made from materials having high silica to lime ratio
Description : Which of the following is not a raw material used for the manufacture of ordinary glass? (A) Iron oxide (B) Soda ash (C) Limestone (D) Silica
Last Answer : (A) Iron oxide
Description : Major component of flint glass is (A) Lead oxide (B) Silica (C) Alumina (D) Soda
Last Answer : (A) Lead oxide
Description : Pick out the wrong statement. (A) Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate (B) Glass is decolorized during its manufacture by ... Na2O . CaO . 6SiO2 (D) Red color is imparted to glass by addition of arsenic oxide
Last Answer : (D) Red color is imparted to glass by addition of arsenic oxide
Description : At what temperature is glass fused to steel in the making of glass-lined equipment? The borosilicate glass is typically fused to carbon steel at a temperature of about 800 0C. 87. What are some typical applications for glass-lined reactors?
Last Answer : Glass-lined equipment gives superior protection to all mineral acids at all concentration and temperatures. One exception is hydrofluoric acid. They are also used is high-purity processes where cleanliness ... to the walls of the vessels while glass-lined vessels have good anti-stick properties.
Description : Common house hold glass (i.e., soda-lime glass) is a/an __________ material. (A) Fully crystalline (B) Partly crystalline (C) Amorphous
Last Answer : (B) Partly crystalline
Description : Sodium calcium silicate is called _______. (1) Hard glass (2) Borosilicate glass (3) Soft glass (4) Jena glass
Last Answer : (3) Soft glass Explanation: Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
Description : Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on (A) Slaked lime (B) Soda lime (C) Calcium perchlorate (D) None of these
Last Answer : (A) Slaked lime
Description : What happens when: a) When a mixture of sodium acetate and soda lime is heated in a hard glass test tube.
Last Answer : Methane gas is evolved. CH 3 COONA + NaOH CaO Na 2 CO 3 + CH 4 b) Methane is burnt in air or oxygen or methane undergoes complete combustion. It forms carbon dioxide and water. CO 2 + H ... ultraviolet light (sunlight). Organic product chloromethane is formed CH 4 + Cl 2 UV CH 3 Cl + HCl
Description : Soda lime glass is
Last Answer : colourless.
Description : Why injectables should not be stored in soda lime glass containers?
Last Answer : Soda lime glass container is not used for the storage of parenterals because: i. It yields an appreciable quantity of alkali to water. ii. Flakes separate comparatively easily. iii. On ... 's relatively high coefficient of expansion makes it liable to fracture with sudden changes of temperature.
Description : State the uses (two each) of the following construction materials: i) Soda lime glass ii) Ferrous metal
Last Answer : i) Soda lime glass: a) Used in window and plate glass b) Glass blocks c) Bottles d) Inexpensive table wares e) Fluorescent and incandescent light bulbs ii) Ferrous metal: a) CI (Cast Iron) ... GI sheets f) Carbon steel is used for making tools g) Weld meshes are used for partition and fencing
Description : Iron & manganese present as pollutant in water cannot be removed by (A) Ion exchange process (B) Oxidation followed by settling & filtration (C) Lime soda process or manganese zeolite process (D) Chlorination
Last Answer : (D) Chlorination
Description : Lime and soda ash are added to water to remove (A) Bicarbonates & sulphates of calcium and magnesium (B) Undesirable taste and odour (C) Bacteria (D) Its corrosiveness
Last Answer : (A) Bicarbonates & sulphates of calcium and magnesium
Description : Consider the following statements: 1. Carbonate hardness is due to bicarbonates. 2. Non-carbonate hardness is due to sulphates and chlorides of Ca and Mg. 3. Both the hardnesses can be removed by lime-soda method. 4. Both the hardnesses can be ... (b) 1, 2 & 4 only (c) 2, 3 & 4 only (d) 1, 2, 3 & 4
Last Answer : (a) 1, 2 & 3 only
Description : Pick out the wrong statement. (A) Caustic embrittlement of boiler's metallic parts is caused by highconcentration of caustic soda in boiler feed water (B) Cooling and freezing of water kills the ... goes on decreasing (D) Dissolved oxygen content in high pressure boiler feed water should be nil
Last Answer : (B) Cooling and freezing of water kills the bacteria present in it
Description : __________ is used as a flux in the smelting of copper ore like chalcopyrite. (A) Coke breeze (B) Lime powder (C) Silica/quartz (D) Dolomite
Last Answer : (C) Silica/quartz
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
Description : The mortar in which both cement and lime are used as binding materials, is called (A) Cement mortar (B) Lime mortar (C) Fire resistant mortar (D) Gauged mortar
Last Answer : Answer: Option D
Description : The maximum percentage of chemical ingredient of cement is that of (A) Magnesium oxide (B) Iron oxide (C) Silica (D) Lime
Description : Pick up the correct statement from the following: (A) Lime in excess, causes the cement to expand and disintegrate (B) Silica in excess, causes the cement to set slowly (C) Alumina in excess, reduces the strength of the cement (D) All the above
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
Description : 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 main ingredient of a good quality brick earth, is (A) Magnesia (B) Lime (C) Silica (D) Alumina
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All the above
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All these
Description : A good brick earth should contain: (A) About 20% to 30% of alumina (B) About 50% to 60% of silica (C) Not more than 5% of lime (D) All the above
Description : Pick up the correct statement from the following: (A) The percentage of absorption for firebricks varies from 5 to 10 (B) The percentage of silica in silica bricks is to the extent of about 95 to 97 ... to 2 percent of lime in silica bricks is added to act as binding material (D) All the above
Description : Pick up the correct statement from the following: (A) The lime in excess makes the cement unsound and causes the cement to expand and disintegrate (B) The silica in excess makes the cement stronger ... time also increases (C) The excess amount of alumina weakens the cement (D) All the above
Description : The main constituent which imparts hydraulicity to hydraulic lime is (A) Calcium oxide (B) Silica (C) Clay (D) Water
Last Answer : Answer: Option C
Description : For the manufacture of Portland cement, the proportions of raw materials used, are (A) Lime 63% ; silica 22% ; other ingredients 15% (B) Lime 22% ; silica 63% ; other ingredients 15% (C) Silica 40% ; lime 40% ; other ingredients 20% (D) Silica 70% ; lime 20% ; other ingredients 10%
Description : The main ingredients of Portland cement are (A) Lime and silica (B) Lime and alumina (C) Silica and alumina (D) Lime and iron
Description : Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth? (A) Lime stone and alumina (B) Silica and alkalies (C) Alumina and iron (D) Alkalies and magnesium
Last Answer : Answer: Option B
Description : Efflorescence is cement is caused due to the excess of (a) Lime (b) Silica (c) Alkalies (d) Iron oxide
Last Answer : (c) Alkalies
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.
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
Description : The maximum percentage of chemical ingredient of cement is (a) Alumina (b) Iron oxide (c) Lime (d) Silica
Last Answer : (c) Lime
Description : The minimum percentage of chemical ingredient of cement is [ A ] Iron oxide [ B ] Silica [ C ] Lime [ D ] Magnesium oxide
Last Answer : [ D ] Magnesium oxide
Description : The maximum percentage of chemical ingredient of cement is [ A ] Iron oxide [ B ] Silica [ C ] Lime [ D ] Magnesium oxide
Last Answer : [ C ] Lime
Description : White cement contains less amount of ___________ [ A ] Lime [ B ] Silica [ C ] Alumina [ D ] Iron oxide
Last Answer : [ D ] Iron oxide
Description : Which of the following constituents impart plasticity to brick earth a) Alumina* b) Silica c) Lime d) Magnesia
Last Answer : a) 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*
Description : Which variety of glass is heat resistant? -Do You Know?
Last Answer : answer:
Description : Which variety of glass is heat resistant? (1) Hard glass (2) Flint glass (3) Pyrex glass (4) Bottle glas
Last Answer : (3) Pyrex glass Explanation: Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass.