The isotope of uranium capable of sustaining chain reactions is
1 U-235
2 U-238
3 U-239
4 None of these
What are nebulae?
Rusting of iron involves 1 Oxidation 2 Reduction 3 Displacement 4 Decomposition
Bell metal is an alloy of 1 Brass an nickel 2 Zinc and copper 3 Tin and copper 4 None of these
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Emerald is ----in colour 1 Violet 2 Yellow 3 Deep green 4 Prussian blue
which country is known as thunderbolt in the world
Soap is a mixture of sodium or potassium salts of 1 Monocarboxylic acids 2 Glycerol’s 3 Dicarboxylic acids 4 Tricarboxylic acids
The vast resources of unutilized natural gas can be used in the production of 1 Graphite 2 Fertilizers 3 Synthetic petroleum 4 Carbide
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Why is food necessary for human body ?
Which of the following has the lease penetrating power? 1 Alpha particles 2 Beta particles 3 Gamma rays 4 All have the same penetrating power
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