Description : Manganese is added in low carbon steel to A. Make the steel tougher and harder B. Raise the yield point C. Make the steel ductile and of good bending qualities D. All of the above
Last Answer : C. Make the steel ductile and of good bending qualities
Description : The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. (A) Silicon (B) Carbon (C) Phosphorous (D) Chromium
Last Answer : Option B
Description : Which of the following exercises most powerful influence on the mechanical properties of steel? (A) Manganese (B) Carbon (C) Phosphorous (D) Silicon
Last Answer : (B) Carbon
Description : Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous
Last Answer : (B) Silicon
Description : __________ is the most important element, which controls the physical properties of steel. (A) Manganese (B) Silicon (C) Carbon (D) Vanadium
Last Answer : (C) Carbon
Description : The yield strength and tensile strength of low carbon steel may be improved by the addition of (A) Manganese (B) Chromium (C) Nickel (D) Vanadium
Last Answer : Answer: Option D
Description : Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and (A) Manganese (B) Silicon (C) Nickel (D) Chromium
Last Answer : (A) Manganese
Description : Which of the following gradients exerts maximum influence on properties of steel? (A) Iron (B) Carbon (C) Manganese (D) Sulphur
Last Answer : Answer: Option B
Description : The element used in the manufacture of safety matches is – (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur
Last Answer : (1) Phosphorous Explanation: One end of a match is coated with a material that can be ignited by frictional heat generated by striking the match against a suitable surface. The coated end ... ," contains either phosphorus or phosphorus sesquisulfide as the active ingredient and gelatin as a binder.
Description : The element used in the manufacture of safety matches is (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur
Last Answer : Phosphorous
Description : A good metallurgical coke should have very low (A) Sulphur & phosphorous content (B) Porosity (C) Fusion point of its ash (D) Hardness & strength
Last Answer : (A) Sulphur & phosphorous content
Description : Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron. (A) Manganese (B) Phosphorous (C) Magnesium (D) Chromium
Last Answer : Option C
Description : Nickel and __________ are the alloying element added in steel to increase its toughness. (A) Molybdenum (B) Chromium (C) Vanadium (D) Silicon
Last Answer : Option D
Description : High amount of sulphur and phosphorous in coke causes (A) Decrease in its calorific value (B) Increase in its strength (C) Brittleness of steel made by using it (D) None of these
Last Answer : (C) Brittleness of steel made by using it
Description : Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron
Description : The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel. (A) Carbon (B) Manganese (C) Both 'a' nor 'b' (D) Neither 'a' nor 'b'
Last Answer : (A) Carbon
Description : Brittleness induced due to the presence of sulphur in steel can be reduced by adding (A) Manganese (B) Magnesium (C) Vanadium (D) Copper
Last Answer : r: Option A
Description : Yield of elemental phosphorous from rock phosphate is about __________ percent. (A) 1-2 (B) 15-25 (C) 40-45 (D) 60-65
Last Answer : (B) 15-25
Description : Iron ore may contain (A) Carbon (B) Silicon (C) Phosphorus and manganese (D) All the above
Description : Weld decay occurs in which of the following steel types? a) Carbon/Manganese b) Low alloy c) Any stainless steel d) Austenitic stainless steels
Last Answer : d) Austenitic stainless steels
Description : Which of the following finds the least commercial use? (A) Pure iron (B) High silicon iron (C) Low carbon steel (D) High carbon steel
Last Answer : (A) Pure iron
Description : In a good rimming steel (A) Carbon and silicon should be low (B) Silicon should be low but carbon should be high (C) Both silicon & carbon should be high (D) Silicon should be high but carbon should be low
Last Answer : (A) Carbon and silicon should be low
Description : Ball bearings are normally made of __________ steel. (A) High speed (B) High carbon (C) Chrome (D) Silicon
Last Answer : (C) Chrome
Description : Which one of the following nonmetals shows allotropy in the liguid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine
Last Answer : (2) Sulphur Explanation: Sulphur is a non-metal that shows allotropy in the liquid state. If sulphur is heated slowly the changes between the different forms can be observed. These changes are in the ... of cold water, plastic sulphur is formed. This is an elastic, rubber-like form of sulphur.
Description : The non-metal used in batteries is a) phosphorous b)nitrogen c) carbon d)sulphur
Last Answer : c) carbon
Description : Which one of the following nonmetals shows allotropy in the liquid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine
Last Answer : Sulphur
Description : Acid rain is caused due to pollution of atmosphere by (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these
Last Answer : oxides of nitrogen and sulphur
Description : Weld decay is caused by the formation of a compound with carbon. The other element in this compound is: a) Manganese b) Sulphur c) Chromium d) Nickel
Last Answer : c) Chromium
Description : Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its (A) Corrosion resistance (B) Tensile strength (C) Machinability (D) Compressive strength
Last Answer : (C) Machinability
Description : Solute atoms which cause yield point phenomenon in mild steel are/is (A) Aluminium (B) Boron (C) Carbon (D) Nitrogen
Description : Psychotic symptoms and parkinsonism like symptoms develop due to inhalation poisoning of (A) Manganese (B) Phosphorous (C) Magnesium (D) Zinc
Last Answer : Answer : A
Description : When the steel is subjected to normalising, its __________ decreases. (A) Yield point (B) Ductility (C) Ultimate tensile strength (UTS)
Last Answer : (B) Ductility
Description : Transformer cores are laminated with (A) Low carbon steel. (B) Silicon sheet steel. (C) Nickel alloy steel. (D) Chromium sheet steel.
Last Answer : (B) Silicon sheet steel.
Description : Bearings subjected to light load are made of (A) White metal (B) Phosphorous bronze (C) Monel (D) Silicon bronze
Last Answer : (B) Phosphorous bronze
Description : In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less. (A) Difference in gross & net calorific value of the coke oven gas (B) Free carbon content in tar (C) Yield percentage of coke (D) Yield of ammonia present in coke oven gas
Last Answer : (A) Difference in gross & net calorific value of the coke oven gas
Description : Duralumin is an alloy of (A) Aluminium, copper and manganese (B) Aluminium, nickel and silicon (C) Aluminium and nickel (D) None of these
Last Answer : (A) Aluminium, copper and manganese
Description : Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese. (A) 1.5-2 (B) 3.5-4.5 (C) 7-9 (D) 12-14
Last Answer : (D) 12-14
Description : Diamond is an allotrope of (a) Tin (b) Silicon (c) Sulphur (d) Carbon
Last Answer : Ans:(d)
Description : In vulcanization, natural rubber is heated with- (1) Carbon (2) Sulphur (3) Silicon (4) Phosphorus
Last Answer : (2) Sulphur Explanation: Vulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur, which results in three-dimensional crosslinking of the chain rubber molecules (polyisoprene) bonded to each other by sulfur atoms.
Description : Brittleness of cold is due to an excess of (A) Sulphur (B) Carbon (C) Phosphorus (D) Silicon
Last Answer : Answer: Option C
Description : Red short iron cracks when bent due to the presence of (A) Sulphur (B) Carbon (C) Phosphorus (D) Silicon
Last Answer : Answer: Option A
Description : __________ is required more for leafy crops. (A) Nitrogen (B) Phosphorous (C) Potassium (D) Carbon
Last Answer : (A) Nitrogen
Description : Which of the following does not come under the category of ‘primary nutrient' for plant growth? (A) Potassium (B) Nitrogen (C) Phosphorous (D) Sulphur
Last Answer : (D) Sulphur
Description : Which of the following is not a measure component necessarily to be present in fertilisers? (A) Nitrogen (B) Potassium (C) Phosphorous (D) Sulphur
Description : ________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant. (A) Calcium (B) Fluorine (C) Phosphorous (D) Sulphur
Last Answer : (B) Fluorine
Description : What is done to raise the dough while making bread? (a) Alcohol is added (b) yeast is added (c) Carbon dioxide is passed (d) Air is passed
Last Answer : Ans:(b)
Description : Which material is suitable for shaft material? a. High speed steel b. Stainless steel or high carbon steel c. Grey cast iron d. Steel having approx. 0.4% carbon and 0.8% manganese
Last Answer : d. Steel having approx. 0.4% carbon and 0.8% manganese
Description : Which of the following is used in pencils? A.Graphite B.Silicon C.Charcoal D.Phosphorous -Science
Last Answer : answer is A. Graphite