Description : Method of separating metals which have low melting point I from an ore is?
Last Answer : Liquation
Description : Which of the following is false? a) electricity is high-grade energy b) high grade forms of energy are highly ordered and compact c) low grade energy is better used for applications like melting of metals rather than heating water for bath
Last Answer : c) low grade energy is better used for applications like melting of metals rather than heating water for bath
Description : While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________ × Tm (where, Tm Melting temperature). (A) 0.25 (B) 0.45 (C) 0.70 (D) 0.95
Last Answer : (C) 0.70
Description : One of the most common physical tests performed on fats is a determination of the ____ point. a. boiling c. melting b. cooling d. separating
Last Answer : c. melting
Description : Which of the following methods will separate water from muddy water? (1) Separating funnel (2) Distillation (3) Crystallization (4) Filtration
Last Answer : (4) Filtration Explanation: There are two ways to get water from a muddy mess: evaporation and filtration. Filtration is a process where the water is pumped through a porous material.
Description : Metals have ______. (1) High melting and boiling point (2) Low melting and boiling point (3) High melting and low boiling point (4) Low melting and high boiling point
Last Answer : (1) High melting and boiling point
Description : Ceramic nuclear metals compared to solid nuclear metals have (A) Higher melting points (B) Low strength at high temperature (C) More chances of radiation damage (D) Poorer corrosion resistance
Last Answer : (A) Higher melting points
Description : The metals with very low melting points which melts by the temperature of palm are A) Sodium and potassium B) Lead and magnesium C) Aluminium and zinc D) Gallium and caesium
Last Answer : D) Gallium and caesium
Description : Change in volume of metals from absolute zero temperature to their melting points is (A) Almost same for all metals (B) Different for different metals (C) Less for low melting point metals (D) Less for high melting point metals
Last Answer : (A) Almost same for all metals
Description : Give reason .the melting point and boiling point of alkali metals are low
Last Answer : The melting and boiling points of the alkali metals are low indicating weak metallic bonding due to the presence of only a single valence electron in them.
Description : Refractory metals are known for which of the following properties: w) lack of chemical reactivity x) low density y) high melting point z) high thermal conductivity
Last Answer : ANSWER: Y -- HIGH MELTING POINT
Description : Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z? A) Has high melting point B) Has low melting point C) Conducts electricity in molten state D) Occurs as solid
Last Answer : B) Has low melting point
Description : __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low. (A) Bucket (B) Throttling (C) Separating (D) A combination of separating & throttling
Last Answer : (D) A combination of separating & throttling
Description : The operator of electrical motors should keep a constant check on the loads they carry because _____________. A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens ... wasted if full loading is not utilized D. power factor correction methods are load dependent
Last Answer : Answer: B
Description : What is the melting point of pure sulfur ?
Last Answer : The melting point of pure sulfur is 119 স C.
Description : A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity
Last Answer : (A) More corrosion resistant
Description : Specific/molar Gibbs free energy for a pure substance does not change during (A) Sublimation (B) Vaporisation (C) Melting (D) Either (A), (B) or (C)
Last Answer : (D) Either (A), (B) or (C)
Description : Metals are good conductors of electricity because (a) The contain free electrons (b) The atoms are lightly packed (c) They have high melting point (d) All of the above
Last Answer : Ans:(b)
Description : Which of the following metals has least, melting point? (1) Gold (2) Silver (3) Mercury (4) Copper
Last Answer : (3) Mercury Explanation: The melting point of the given metals (in Celsius) are:- Gold: 1063; Silver: 961; Copper: 1083; Mercury: 38.86. Mercury is the only elemental metal known to melt at a generally cold temperature.
Description : Metals are good conductors of electricity because - (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above
Last Answer : (1) they contain free electrons Explanation: Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
Description : Metals are good conductors of electricity because – (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above
Description : Brazing filler metal used for joining steel plates (A) Melts below the melting points of base metals (B) Melts below 300°C (C) Is copper phosphorous alloy
Last Answer : (A) Melts below the melting points of base metals
Description : Brazing is the joining of metals (A) Without melting the base metal (B) With a non-ferrous filler (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : Option C
Description : Pick out the wrong statement. (A) A soft magnetic material should have high permeability and small area of hysteresis loop (B) Poisson's ratio of high melting point metals is more than unity (C) ... less than 185°C (D) Steel produced by B.O.F process is ideally suited for manufacturing flat product
Last Answer : Option B
Description : Give reason for the higher melting point and boiling point of alkali earth metals than alkali metals.
Last Answer : The melting and boiling points of these metals are higher than the corresponding alkali metals due to smaller sizes.
Description : Which of the following metals has least melting point ? (1) Gold (2) Silver (3) Mercury (4) Copper
Last Answer : Mercury
Description : Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure metal.
Last Answer : Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure ... Statement-1 is false but Statement -2 is true
Description : Consider the following statements: 1. when an electric bulb is switched on, the resistance of its tungsten filament increases. 2. the resistance of pure metals increases on heating. Which of the above statements is/are correct? (a) Both 1 and 2 (b) only 1 (c) only 2 (d) Neither 1 nor 2
Last Answer : Ans:(a)
Description : With rise in temperature the resistance of pure metals?
Last Answer : With rise in temperature the resistance of pure metals increases.
Description : If a substance forms crystals when it solidifies its melting and freezing points are the same?
Last Answer : Melting and freezing points are identical.
Description : The point at which the solid, liquid and gaseous forms of a substance co-exist is called its (a) boiling point (b) melting point (c) triple point (d) freezing point
Last Answer : Ans:(c)
Description : The point at which the solid, liquid and gaseous forms of a substance co-exist is called its (a) Boiling point (b) Melting point (c) Triple point (d) Freezing point
Description : What is an example of a alloy and how its properties may make it more useful than a pure metal?
Last Answer : Feel Free to Answer
Description : State as to why: (a) A solution of Na2CO3 is alkaline? (b)alkali metals are prepared by electrolysis of their fused chlorides ? (c)sodium is found to be more useful than potassium ?
Last Answer : Ans. (a) It undergoes hydrolysis to produce a strong base NaOH . (b) When the aq. Solution of any alkali metal is subjected to electrolysis ,H2 instead of the alkali metal is produced at the ... of sugars and amino acids into the cells. Thus, sodium is found to be more useful than potassium.
Description : Mention the methods of obtaining ultra pure metal.
Last Answer : a) Fractional crystallization or zone refining. b) Vacuum melting c) Distillation d) Chemical vapour deposition e) Liquation process
Description : Electrometallurgical methods of metal extraction is normally used for those metals (A) Whose oxide/ore is not reduced by carbon (B) Which fall in the category of alkali & alkaline earth metals (C) Which stands higher in the electrochemical series of the metal (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : In which of the following welding methods, the molten metal is poured for joining the metals ? (a) Gas welding (b) Thermit welding (c) TIG welding (d) Arc welding
Last Answer : In which of the following welding methods, the molten metal is poured for joining the metals ? (a) Gas welding (b) Thermit welding (c) TIG welding (d) Arc welding
Description : How did Mendel obtain pure or true breeding varieties of the contrasting forms of pea plants?
Last Answer : Mendel obtained pure or true breeding varieties of pea plants by allowing them to self pollinate for several generations.
Description : The metamorphic rock which forms from pure limestone is: w) slate x) gneiss y) schist z) marble
Last Answer : ANSWER: Z -- MARBLE
Description : Which of the following metal forms amalgam with other metals?
Description : Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air (1) Na (2) Rb (3) K (4) Li
Last Answer : Li
Description : Which one of the following best defines the word allotropes ? A Different structural forms of an element B A pair of substances that differ by H+ C Elements that possess properties intermediate between ... a specific number of neutrons E The different phases (solid, liquid or gas) of a substance
Last Answer : A Different structural forms of an element
Description : Separating credit card accounts in an amicable separation?
Last Answer : Pay off all of them and close them. Now each person can get their own. Not messy.
Description : Are the people who are separating children from families "merely following orders"?
Last Answer : It isn’t an “either/or” condition. They are “following orders” that they truly believe are legitimate and lawful.
Description : Which is the better long term national investment? $12 billion in aid for Houston and hurricane repairs? Or $12 billion to build a wall separating the US from Mexico?
Last Answer : Aren’t you going to need the Mexicans to do the actual rebuilding? No point building a wall yet.
Description : Does separating people into generations (Gen X, Baby Boomers) tell us anything about the country/world?
Last Answer : No, it is only another way to record the passage of time. Each generation has its heroes and its goats.
Description : How do I keep cheddar from separating or becoming grainy when cooked?
Last Answer : My (limited) experience with this has always been that grated or very finely diced cheddar melts great and is as creamy as one could want.
Description : What is the primary distinction separating CBT(Cognitive Behavioral Therapy) from Behavior Therapy?(please see details)
Last Answer : The cognitive term implies that the process enlists the intelligence of the patient in helping achieve change. Older behaviorist methods assumed a person was more like a machine, and only needed training via stimulus and response (S-R).
Description : How would you convince an angry 9 year old boy not to run away after finding out his parents are separating?
Last Answer : Nine year olds are old enough to comprehend pretty serious stuff. He wants to run away because he's afraid and unsure of how to cope with such a scary situation, but pacifying him is not the way ... his parents' decision, which may be the outcome he is hoping for, and acting out of desperation.
Description : If chocolate seems to be separating, how do you get it to come back together?
Last Answer : Counseling.