Description : Di-calcium silicate (C2S) (A) Hydrates rapidly (B) Generates less heat of hydration (C) Hardens rapidly (D) Provides less ultimate strength to cement
Last Answer : Answer: Option B
Description : Dicalcium silicate (C2S) [ A ] rates rapidly [ B ] Hardens rapidly [ C ] Generates less heat of hydration [ D ] Has less resistance to sulphate attack
Last Answer : [ C ] Generates less heat of hydration
Description : The presence of dicalcium silicate in cement. (a) Hydrates the cement slowly. (b) Generates less heat of hydration. (c) Has more resistance to sulphate attack. (d) All of these
Last Answer : (d) All of these
Description : The presence of tricalcium silicate in cement (a) Hydrates the cement rapidly (b) Generates less heat of hydration. (c) Offer high resistance to sulphate attack (d) All of these
Last Answer : (a) Hydrates the cement rapidly
Description : Pick up the incorrect statement from the following: (A) Tricalcium silicate (C3S) hydrates rapidly (B) Tricalcium silicate (C3S) generates more heat of hydration (C) Tricalcium silicate (C3S) develops early strength (D) Tricalcium silicate (C3S) has more resistance to sulphate attack
Last Answer : Answer: Option D
Description : A slow setting cement will have higher percentage of a) tricalcium aluminate b) tricalcium silicate c) Gypsum d) Dicalcium silicate*
Last Answer : C2s
Description : The constituent of cement which act as Binders are a) Sand and silica b) Silica and carbon c) tricalcium silicate dicalcium silicate and carbon d) tricalcium aluminate,dicalcium silicate and tricalcium silicate *
Last Answer : d) tricalcium aluminate,dicalcium silicate and tricalcium silicate *
Description : Hydration of cement is due to chemical action of water with (A) Tricalcium silicate and dicalcium silicate (B) Dicalcium silicate and tricalcium aluminate (C) Tricalcium aluminate and tricalcium alumino ferrite (D) All the above
Description : Hydration of cement is due to the chemical action of water with. (a) Tricalcium silicate (b) Dicalcium silicate (c) Tricalcium aluminate (d) All of these
Description : The development of first 28 days strength is on account of the hydration of (a) Tricalcium silicate (b) Dicalcium silicate (c) Tricalcium aluminate (d) Tetra calcium alumina ferrite
Last Answer : (a) Tricalcium silicate
Description : Which of the following cements contains maximum percentage of dicalcium silicate? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement
Description : High percentage of tricalcium silicate and low percentage of dicalcium silicate in cement results in. (a) Rapid hardening (b) High early strength (c) High heat of generation (d) All the above
Last Answer : (d) All the above
Description : Setting of plaster of paris involves – (1) dehydration process (2) hydration to form other hydrates (3) oxidation process (4) reduction process
Last Answer : (2) hydration to form other hydrates Explanation: The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate and hardening of Plaster of Paris is ... . A slight expansion takes place in the process and heat is evolved. This process is exothermic.
Description : Setting of plaster of paris involves (1) dehydration process (2) hydration to form other hydrates (3) oxidation process (4) reduction process
Last Answer : hydration to form other hydrates
Description : Pick up the correct statement from the following: (A) Water cement paste hardens due to hydration (B) During hardening cement binds the aggregates together (C) Cement provides strength, durability and water tightness to the concrete (D) All the above
Description : The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from. (a) 50 to 60% (b) 60 to 70% (c) 70 to 80% (d) 80 to 90%
Last Answer : (c) 70 to 80%
Description : About 70% to 80% of cement is contributed by [ A ] Tricalcium silicate and Tricalcium aluminate [ B ] Tricalcium silicate and Dicalcium silicate [ C ] Tricalcium Aluminate and Dicalcium silicate [ D ] Tricalcium Aluminate and Tetra calcium Aluminoferrite
Last Answer : [ B ] Tricalcium silicate and Dicalcium silicate
Description : Tricalcium aluminate (C3A) (A) Reacts fast with water (B) Generates less heat of hydration (C) Causes initial setting and early strength of cement (D) Does not contribute to develop ultimate strength
Description : Quicksand is a) Moist sand containing a small percentage of clay b) Is a condition which generally occurs in coarse sands c) Is a condition in which cohesive properties of soil increase rapidly d) Is a condition in which a cohesion less soil loses its strength because of upward flow of water
Last Answer : d) Is a condition in which a cohesion less soil loses its strength because of upward flow of water
Description : The setting and hardening of cement after addition of water is due to a) Binding action of water b) Evaporation of water c) Hydration and hydrolysis of some constituent compounds of cement* d) Additional hardening compounds added to cement
Last Answer : c) Hydration and hydrolysis of some constituent compounds of cement*
Description : Crucible is repaired by? (i) Magnasite Powder (ii) Magnasite Powder & Sodium Silicate.* (iii) Sodium Silicate (iv) Aluminium powder
Last Answer : (ii) Magnasite Powder & Sodium Silicate.*
Description : The property of soil which allows it to be deformed rapidly, without rupture, without elastic rebound and without volume change is known as a) Porosity b) Plasticity* c) Stiffness d) Plastic limit
Last Answer : b) Plasticity*
Description : The compound of Portland cement which reacts immediately with water and also sets first is (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra calcium alumino ferrite
Last Answer : Answer: Option C
Description : The first compound which reacts with water when mixed with cement is (a) Tricalcium Aluminate (b) Tricalcium silicate (c) Di-calcium silicate (d) Teracalcium aluminate
Last Answer : (a) Tricalcium Aluminate
Description : Metronidazole is selectively active against anaerobic organisms because: A. Aerobes have an active transport mechanism to pump it out of their cell B. Only anaerobes reduce it to generate the reactive ... inactivated in the presence of oxygen D. It binds to DNA of anaerobes with high affinity
Last Answer : B. Only anaerobes reduce it to generate the reactive nitro radical
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 : A FDA – approved ingredient for protection against painful sensitivity of the teeth due to cold, heat, acids, sweets or contact is (a) Dicalcium phosphate (b) Sodium lauryl sulfate (c) 5% potassium nitrate (d) Zinc chloride (e) Calcium carbonate
Last Answer : Ans: C
Description : Which of the following amines reacts most rapidly with
Last Answer : Which of the following amines reacts most rapidly with A. B. C. D.
Description : Which of the following compounds reacts least rapidly in electrophilic substitution reactions? (a) Nitrobenzene (b) Phenol (c) Bromobenzene (d) Toluene
Last Answer : Nitrobenzene
Description : Which of the following compounds reacts most rapidly with HNO3/H2SO4? (a) toluene (b) anisole (c) nitrobenzene (d) benzonitrile
Last Answer : anisole
Description : Which compound reacts most rapidly by an SN1 mechanism? (a) Methyl chloride (b) Isopropyl chloride (c) Ethyl chloride (d) tert-Butyl chloride
Last Answer : tert-Butyl chloride
Description : Whether you choose or whether you don't, I leap from the peak to the hope of a bond. Attempts to extinguish my work's divine, Only hardens the grip-holds in time. What am I? -Riddles
Last Answer : Love.
Description : What is the meaning of HAZ ? (i) Heat around Zone. (ii) Heat alongwith Zone (iii) Heat affected Zone* (iv) Heat added zero.
Last Answer : (iii) Heat affected Zone*
Description : Late tapping will cause defect of? (i) Lack of fusion (Heat losses)* (ii) Piping defect (iii) kidney defect (iv) All above are correct
Last Answer : (i) Lack of fusion (Heat losses)*
Description : Late tapping will cause defect of? (i) Lack of fusion (Heat losses)* (ii) Piping defect (iii) Half moon defect (iv) None of above
Description : Which type of following cement is used for mass concrete work a) High Alumina cement b) Quick setting cement c) Rapid hardening cement d) Low heat cement*
Last Answer : d) Low heat cement*
Description : The water in an open pond remains cool even in hot summer because (a) Of continuous evaporation of water (b) Water radiates heat more rapidly than the atmosphere (c) Water absorbs heat less rapidly than the atmosphere (d) Water absorbs heat more rapidly than the atmosphere
Last Answer : Ans:(c)
Description : Piping in a soil mass is a) Erosion of subsoil by the high velocities of flow of water through it when such velocities exceed a certain limit* b) Caused due to very low exit gradient c) ... connected pores d) Due to loss of the strength of cohesion less soil because of upward flow of of water
Last Answer : a) Erosion of subsoil by the high velocities of flow of water through it when such velocities exceed a certain limit*
Description : Definition of minor bridge e) Single span less than 12m f) Total linear water way less than 18m g) Both a) & b)* h) None of the above
Last Answer : g) Both a) & b)*
Description : The pumping system should be capable of supplying the normal quantity of water required in 24 hours in a)12 hours or less b) 16 hours or less c) 20 hours or less* d) 8 hours or less
Last Answer : c) 20 hours or less*
Description : After "Metta World Peace" smashed his elbow into the side of James Harden's head, what should "Peace's" new name be?
Last Answer : meathead world piss
Description : Do Volcanic necks and dikes form when magma cools and hardens into rock after reaching the surface?
Last Answer : No, these features form when magma cools into rocks BEFOREreaching the surface.
Description : What is magma that is blasted into the air hardens and forms?
Last Answer : Feel Free to Answer
Description : Pick out the correct statement. (A) Hot worked materials are subjected to annealing to remove internal stresses (B) Annealing of steel hardens it slightly (C) Normalising of a material induces stresses (D) Tempering of a material improves ductility & toughness but reduces hardness & brittleness
Last Answer : (D) Tempering of a material improves ductility & toughness but reduces hardness & brittleness Share
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 : Pick up the correct statement from the following: (A) The heating of a material to redness in contact with air, is known as calcination (B) The property of lime by which it sets or hardens in ... (C) The product that remains after calcination of limestone, is called lime (D) All the above
Description : When clay hardens into rock, it forms: w) coal x) limestone y) shale z) quartzite
Last Answer : ANSWER: Y -- SHALE
Description : Category “B” station are those, where annual passenger earnings are (a) Rs. 6 to 10 crores (b) Rs. 3 to 6 crores* (c) Rs. 1 to 3 crores (d) Less than Rs. 1 crore
Last Answer : (b) Rs. 3 to 6 crores*
Description : For Category “A” stations, the annual passenger earning should be (a) Rs. 10 crores of more (b) Rs. 6 crores or more* (c) Rs. 3 crores or more (d) Less than Rs. 3 crores
Last Answer : b) Rs. 6 crores or more*