Description : Which of the following methods is most accurate for the determination of the water content of soil? (A) Oven drying method (B) Sand bath method (C) Calcium carbide method (D) Pycnometer method
Last Answer : Option A
Description : For proper field control, which of the following methods is best suited for quick determination of water content of a soil mass? (A) Oven drying method (B) Sand bath method (C) Alcohol method (D) Calcium carbide method
Last Answer : Answer: Option D
Description : You are given a sample of soil containing coarse grains to determine its water content, you will use (A) Pycnometer (B) Oven-drying method (C) Calcium carbide method (D) Alcohol method
Last Answer : Answer: Option A
Description : State the procedure for the determination of water content by oven-drying method.
Last Answer : i) This is commonly adopted and simplest method for determination of water content of a soil sample in the laboratory. ii) The method basically consists of drying a weighed moist sample of soil in an oven ... The above table gives the minimum quantity of soil sample to be taken for test.
Description : Determination of water content of a soil sample suspected to contain gypsum is made by drying the sample for longer period at a temperature not more than (A) 60°C (B) 80°C (C) 100°C (D) 110°C
Last Answer : (B) 80°C
Description : Commercial production of calcium carbide requires limestone and __________ as raw materials. (A) Coke (B) Sand (C) Soda ash (D) Fuel oil
Last Answer : (B) Sand
Description : Coke used for the production of calcium carbide should have (A) Low ash content (B) Low ignition temperature (C) High electrical resistivity (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Pick up the correct statement from the following: (A) Melamine is obtained from calcium carbide (B) Formaldehyde is prepared synthetically from methane (C) The melamine when reacted with formaldehyde forms the melamine-formaldehyde resin (D) All the above
Description : The most common drying method is ____ drying. a. freeze- c. spray b. sun or tray drying d. oven
Last Answer : c. spray
Description : Ceramic recuperators are generally made of (A) Silicon carbide (B) Calcium carbide (C) Fireclay bricks (D) High alumina bricks
Last Answer : (A) Silicon carbide
Description : The field density and field moisture content of a soil can be determined by 1. Core cutter method 2. Sand replacement method 3. Proctor compaction test 4. Modified proctor compaction test (a) 1, 2, 3 & 4 (b) 1 & 2 only (c) 2 & 3 only (d) 2 & 4 only
Last Answer : (b) 1 & 2 only
Description : Do you have trouble drying your back after a bath?
Last Answer : You’re a big guy, like me. I use two towels. One for my lower body, one for my upper body. If I use just one, it won’t completely dry me… I also shake off, like a dog, before I get out of the shower.
Description : After drying, a bath sponge contains
Last Answer : After drying, a bath sponge contains A. Hold fast B. Tentacles C. Spicules D. Spongin fiber
Description : Reaction of calcium carbide with water produces a gas, which is used (A) As an illuminant (B) For metal cutting/welding (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : What is the gaseous product formed from the reaction of calcium carbide and water?
Last Answer : ANSWER: ACETYLENE (or ETHYNE OR C2H2)
Description : Pick up the correct statement from the following: (A) A highly absorptive aggregate reduces the workability of concrete considerably (B) The specific gravity of aggregate is important for the determination ... and porosity of an aggregate influence the property of the concrete (D) All the above
Description : Water content of a soil sample is the difference of the weight of the given sample at the given temperature and the weight determined after drying it for 24 hours at temperature ranging from (A) 80° to 90°C (B) 90° to 95°C (C) 103° to 105°C (D) 105° to 110°C
Last Answer : (D) 105° to 110°C
Description : `underset("Calcium carbide")(CaC_(2))overset(H_(2)O)(to)(A)overset("Red hot Cu tube")(to)(B)`, Product (B) of the reaction is:
Last Answer : `underset("Calcium carbide")(CaC_(2))overset(H_(2)O)(to)(A)overset("Red hot Cu tube")(to)(B)`, Product (B) of the reaction is: A. B. C. D.
Description : Which chemical is used to ripen mangoes artificially? (1) Sulphur Dioxide (2) Nitrous Oxide (3) Calcium Carbide (4) Phosphorous
Last Answer : (3) Calcium Carbide Explanation: The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.
Description : Carborundum is another name of – (1) Silicon carbide (2) Silicon oxide (3) Calcium carbide (4) Calcium oxide
Last Answer : (1) Silicon carbide Explanation: Silicon carbide, also known as carborundum, is a compound of silicon and carbon with chemical formula SiC. It occurs in nature as the extremely rare mineral moissanite. Silicon carbide powder has been massproduced since 1893 for use as an abrasive.
Description : The chemical that is used to ripen mangoes is - (1) Calcium sulphide (2) Calcium carbide (3) Calcium carbonate (4) Calcium chloride
Last Answer : (2) Calcium carbide Explanation: Calcium carbide is used for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite ... the natural ripening agent ethylene. Acetylene acts like ethylene and accelerates the ripening process.
Description : Calcium salts used as fertilizer is – (1) Calcium Carbide (2) Calcium Carbonate (3) Calcium Cyanide (4) Calcium Sulphate
Last Answer : (4) Calcium Sulphate Explanation: Sulphur (as sulphate) is a major plant nutrient, and is essential for crop growth. Calcium Sulphate (gypsum) is used to improve soil quality. Calcium sulphate ... It is mainly used for the reclamation of sodic soils through ion exchange (calcium replacing sodium).
Description : Carbon supply in pack carburising process is in the form of (A) Charcoal (B) Calcium carbide (C) Hydrocarbon oil (D) Graphite
Last Answer : (A) Charcoal
Description : The main constituent of carborundum is __________ carbide. (A) Calcium (B) Silicon (C) Boron (D) Aluminium
Last Answer : (B) Silicon
Description : Why are Calcium Carbide (CaC 2 ), Carbon monoxide (CO), Carbon dioxide (CO 2 ), Hydrogen cyanide (HCN) and calcium carbonate (CaCO 3 ) classified as inorganic compounds through they contain carbon?
Last Answer : These compounds contain only one or two carbon atoms per formula unit and contain no carbon-carbon (C-C) bonds or carbon-hydrogen bonds. Hence they are classified as inorganic compounds.
Description : Which gas is produced after the application of Calcium Carbide to the fruits, for rapid ripening? a. Methane b. Carbon-di-oxide c. Acetylene d. Ethylene
Last Answer : c. Acetylene
Description : In primitive days, __________ was being manufactured by Leblanc Process. (A) Alum (B) Washing soda (C) Soda ash (D) Calcium carbide
Last Answer : (C) Soda ash
Description : The temperature in the calcium carbide furnace is __________ °C. (A) 200-300 (B) 700-850 (C) 2000-2200 (D) 4000-4500
Last Answer : (C) 2000-2200
Description : Mannheim furnace is used in the manufacture of (A) Hydrochloric acid (B) H2SO4 by Chamber process (C) Calcium carbide (D) Corundum
Last Answer : (A) Hydrochloric acid
Description : Carborundum consists mainly of (A) Bauxite (B) Silicon carbide (C) Boron carbide (D) Calcium carbide
Last Answer : (B) Silicon carbide
Description : For the irreversible reaction, Ca+ 2C = Ca C2, Δ H°298 = - 60000 J . mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved ... will be (A) 30,000 J (B) 60,000 J (C) 90,000 J (D) 2,40,000 J
Last Answer : (C) 90,000 J
Description : Explain manufacturing of Acetylene using Calcium carbide as a raw material.
Last Answer : Acetylene from CaC2 Raw materials: lime stone, coke, water Chemical reactions: CaO + 3C CaC2 + CO CaC2 + H2O Ca(OH)2 + CH≡CH Process Description: Calcium carbide is produced ... decomposes violently at 650˚C . Hence temperature is maintained below 150˚C and 30 cm of water pressure.
Description : The chemical that is used to ripen mangoes is (1) Calcium sulphide (2) Calcium carbide (3) Calcium carbonate (4) Calcium chloride
Last Answer : Calcium carbide
Description : Calcium salts used as fertilizer is : (1) Calcium Carbide (2) Calcium Carbonate (3) Calcium Cyanide (4) Calcium Sulphate
Last Answer : Calcium Sulphate
Description : Carborundum is another name of (1) Silicon carbide (2) Silicon oxide (3) Calcium carbide (4) Calcium oxide
Last Answer : Silicon carbide
Description : The practical limit of moisture content achieved in air drying of timber is (A) 5 % (B) 15 % (C) 25 % (D) 35 %
Last Answer : Answer: Option B
Description : Which of the following methods are employed for determination of free and combined chlorine residuals in water ? 1. Starch-iodide method 2. Orthotolidine method 3. Amperometric titration method 4. SNORT method 5. DPD method a) 1, 2, ... b) 1, 2 and 3 only c) 3, 4 and 5 only d) 2, 3, and 4 only.
Last Answer : a) 1, 2, 4 and 5
Description : Shrinkage volume in cement setting does not depend upon the (A) Sand to cement ratio (B) Water to cement ratio (C) Ambient temperature fluctuation (D) Drying period
Last Answer : (A) Sand to cement ratio
Description : PROBLEM FA sample of soft saturated clay weighs 350 grams and has a volume of 205cc. After oven drying, the soil weighs 225 grams. Calculate the values of saturated unit weight, void ratio, porosity and specific gravity?
Last Answer : {
Description : What is a drying oven and how does it work?
Last Answer : There are several different types of drying ovens, such as ones for the food (kitchen drying oven), and ones for scientific purposes (laboratory drying oven). They all basically do the same thing, which is dry things (food or lab equipment) at a low temperature for an extended time period.
Description : Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the (A) Hot scarfing of steel slabs (B) Mixing with blast furnace gas (C) Coke oven battery heating (D) Steel ladle drying
Last Answer : (C) Coke oven battery heating
Description : Give reason: Sand is used during roasting and as sand bath in chemical reactions.
Last Answer : As silicon has high thermal and non combustible property.
Description : Which of the following methods is best suited for determination of permeability of coarse-grained soils? (A) Constant head method (B) Falling head method (C) Both the above (D) None of the above
Description : Which of the following methods is more suitable for the determination of permeability of clayey soil? (A) Constant head method (B) Falling head method (C) Horizontal permeability test (D) None of the above
Description : For determination of average annual precipitation in a catchment basin, the best method is (A) Arithmetical method (B) Thiessen's mean method (C) Isohyetal method (D) None of these
Last Answer : Answer: Option C
Description : In the method of voids for determination of the quantity of cement paste, it is assumed that (A) Voids in coarse aggregates are filled by fine aggregates (B) Voids in fine aggregates are filled by ... of fine aggregates is equal to total voids in coarse aggregates plus 10% extra (D) All the above
Description : Which of the following correspond to the recommendations of IRC for pavement thickness determination by CBR Method ? 1. CBR tests are to be conducted in-situ 2. Static compression is best adopted 3. The top 50 cm of sub grade ... 1, 2 and 3 (b) 1 and 2 only (c) 2 and 3 only (d) 1 and 3 only
Last Answer : (c) 2 and 3 only
Description : The weight of a pycnometer containing 400 g sand and water full to the top is 2150 g. The weight of pycnometer full of clean water is 1950 g. If specific gravity of the soil is 2.5, the water content is (A) 5 % (B) 10 % (C) 15 % (D) 20 %
Last Answer : (D) 20 %