OAS Prelims-2020 Daily Practice Set-12/01/2021: Discoveries and Inventions

1. Who invented optical fibre?a) Samuel Cohenb) Narinder Kapanyc) Percy L.Spencerd) T.H. Maimah 2. Who invented Radar?a) J. H. Van Tasselb) Wilhelm K. Roentgenc) P. T. Farnsworthd) A. H. Taylor and Leo C. Young 3. Who produced the first automobile ?a) Gottleib Daimlerb) Henry Fordc) Rudolf Dieseld) Karl Benz 4. Who was associated with the …

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OAS Prelims-2020 Daily Practice Set-11/01/2021:Chemistry

1. The gas used for artificial fruit ripening of green fruit is:a) Ethyleneb) Acetylenec) Ethaned) Methane 2. The three elements most needed in common fertilizers are :a) Sulphur, Phosphorous and Sodiumb) Nitrogen, Potassium and Phosphorousc) Phosphorous, Sodium and Nitrogend) Calcium, Phosphorous and Potassium 3. Which one of the following metals pollutes the air of a …

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