Friday, 21 April 2017


1What is the name given to an almost circular coral reef inside which there is a lagoon?Atoll
2Chocolates can be bad for health because of a high content of which element?Nickel
3Galvanised iron sheets have a coating of which metal?Zinc
4Chlorophyll is a naturally occuring chelate compound, what is the central metal in this?Magnesium
5Chemical name of Washing soda is?Sodium carbonate
6What will you put into pure water in order to pass electric current through it?Common Salt
7Which fuel causes minimum environmental pollution?Hydrogen
8Which hydrocarbon is mainly present in gobar gas?Methane
9The cause of fractional atomic weights of elements?The presence of Isotopes
10Which gas has maximum calorific value?Oil gas
11Phosgene is obtained by the reaction of carbon monoxide and which gas?Chlorine
12Which petroleum refinery product has the lowest boiling point?Gasoline
13Which sets indicated the Aeolian process? 65292Corrosion, attrition, deflation
14Which compound does not contains an OH group?Aldehyde
15Maximum hydrogen bonding would be observed in which compound?Methanol
16What are the metallic constituents of hard water?Calcium, magnesium and iron
17What is the maximum number of hydrogen bonds in a H2O molecule?4
18The nitrogen percentage is the highest in which fertilizer?Urea
19Which are the high-temperature superconductors?Ceramic oxides
20Which Pollutant is produced from vehicles that cause mental diseases?Pb (lead)
21What makes a lemon sour?Citric acid
22In which type of coal percentage of carbon is the highest?Anthracite
23What is formed when white phosphorus is heated at 540 K in the absence of air? 72 0Red phosphorus
24Which acid is used to remove ink and rust stains and cloth?Oxalic acid
25Which metal is present in photo films?Silver
26Which is the highest grade of coal whose surface is shining and has the highest calorific value?Anthracite
27Which is an element which never exhibits positive oxidation state in any of its compounds?Fluorine
28Blue litmus paper is converted into red in solution of which thing?acid
29Which is another name of RDX?Cycionite
30What is the negative logarithmic value of hydrogen on called?pH
31A bee-sting leaves an acid which causes pain and irritation. which is that injected acid?Methanoic acid
32In an atomic nucleus, by which force are neutrons and protons held together?Exchange forces
33By which a mixture of naphthalene and benzoic acid can be separated?Chromatography
34By which Carbon and hydrogen are estimated in organic compounds?Liebig's method
35Which isotope of uranium capable of sustaining chain reactions?U-235
36Which is natural source of gamma-rays?Radon gas
37Which is the substance which can act both as an acid and a base?Amphoteric
38Where is the Smog is likely to occur?Near the industrial areas
39Which property of the elements is a whole number?Atomic number
40What are the atoms of the elements which have same number of neutrons called?Isotones
41What happens to the level of mercury in the barometer tube when it is taken down a coal mine?It rises
42Which metal is extracted by electrolytic reaction method?Al (Aluminium)
43Which is the basis of modern periodic table?Atomic number
44By which can the location and energy of an electron in an atom be specified?Quantum numbers
45Which is also called Stranger Gas?Xenon
46Mixture of which pair of gases is the cause of occurrence of most of the explosions in mines?Methane and air
47Rainwater collected after 30 to 40 minutes of raining is not suitable for drinking why?Because it is acidic
48What is the poison of honey bee?0 65292Acidic
49Which inorganic precipitate acts as semipermeable membrane?Copper ferrocyonide
50In which biological process sugar is oxidised to release energy?Respiration

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