Friday, 21 April 2017


1To prepare a standard solution of a substance, what is generally used?Measuring flask
2How does Transfer of heat energy from the sun to the moon take place?By radiation only
3Which is an active component of oil of clove?Eugenol
4In methane molecule how are the four hydrogen atoms arranged?As tetrahedral
5What are Rubies and Sapphires chemically known as?Aluminium oxide
6Which pair of metals constitutes the lightest metal and the heaviest metal, respectively?72Lithium and osmium
7Energy transferred to a person through gamma rays is measured in by which unit?Roentgens
8Which element has the lowest electron affinity?Argon
9What does the emission of ß-particle?Increases the atomic number by one
10A fruity smell is obtained by the reaction of ethanol with which compound?CH3COOH
11Which gas do not considered as polluting agent of air?CO2
12Which compound caused tragedy of Bhopal in 1984?Methyl isocynate
13Which compound is used as an antichlor?Na2S2O3
14Which chemical used as a 'fixer' in photography?Sodium thiosulphate
15Which metal has the highest density?Platinum
16In human body, into which does the pancreas secretes its enzymes?Duodenum
17Which compound is used in anti-malarial drug?Chloroquin
18What does Soda water contain?Carbon dioxide
19Which processe of weathering belongs to both mechanical and chemical weathering?Crystallization
20What is the main constituent of vinegar?Acetic acid
21Which compound is used for writing on glass?Hydrogen fluoride
22Which compound is commonly used as antifreeze in automobile radiators?Glycerol
23When water vapours are passed over aluminium carbide, what do we get?Methane
24What are soaps?Sodium or potassium salts of heavier fatty acids
25Which material is suitable for water purification?Zeolites
26Which chemical is used in foam fire extinguishers?Aluminium sulphate
27Which element is with the highest electrical conductivity?Silver
28During electrolysis, which the species are discharged at cathode?Cations
29Non-stick cooking utensils are coated with which metal?Teflon
30Which represents a process of chemical weathering?Hydration and Hydrolysis
31How can Permanent hardness of water be removed?0 65292By adding washing soda
32Which nuclear particles responsible for holding all nucleons together?Mesons
33What is generally present in tonics?Ethanol
34Which component of the atmosphere has increased during the last 200 years?Carbon dioxide
35What does mixture of CS2 and H2S on passing over heated copper give?Methane
36Of which metal were the tools and weapons of Harappan civilisation?Copper, tin and bronze
37Which is associated with the formation of brown air in traffic congested cities?Nitrogen oxide
38Balloons are filled with which gas?Helium
39Which are the The best and the poorest conductors of heat respectively? 72Silver (Ag), and lead (Pb)
40Which metal is not attacked by the environment?Gold
41Which colloidal solution is used in photography?Colloidal silver bromite
42A temperature difference of 25°C is equivalent to a temperature difference of howmany F?45° F
43A deuterium nucleus consists of which particles?One proton and one neutron
44How many moles are there in 140 g of Si (atomic mass of silicon is 28)?5
45Which is used in storage batteries?Lead
46An element X forms an oxide X03.6
47Which polymeric material is used for making bullet proof jacket?KEVLAR
48Which is the main ingredient in cement?Lime stone
49Which elementis produced when concentrated cinnabar is roasted in the excess of air?Hg
50Which nuclides having the same number of neutrons but different number of protons or mass number? 65292Isotones

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