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The isotope of uranium capable of sustaining chain reactions is
1 U-235
2 U-238
3 U-239
4 None of these
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The year in which magnetic observations were started in mumbai and thiruvananthapuram?
Catalytic properties of a substance may be best defined as a phenomenon of 1 Absorption 2 Chemisorption 3 Adsorption 4 None of these
Which among the following is a positively charged particle emitted by a radioactive element? 1 Alpha ray 2 Beta ray 3 Gamma ray 4 Cathode ray
Polythene is industrially prepared by the polymerization of 1 Methane 2 Styrene 3 Acetylene 4 Ethylene
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Write two characteristics of Science.
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The purest form of iron is 1 Steel 2 Cast iron 3 Pig iron 4 Wrought iron
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why nitrogen is about 70%(i.e.)highest percentage in environment
Biological Sciences 
