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Replace ‘ precedes before’ with ‘precedes.’
Who among the following developed the technology of under-ground nuclear explosion?
The speed of a fast moving electron, having total energy of 2 MeV, is nearly:
The wave nature of matter was proposed by:
Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by –
Match List-I with List-II and select the correct answer using the code given below the Lists: