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Question:- The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is A. Argon B. Xenon C. Helium D. Krypton
Answer:- Option C
Question:- The gases used in different types of welding would include A. oxygen and hydrogen B. oxygen, hydrogen, acetylene and nitrogen C. oxygen, acetylene and argon D. oxygen and acetylene
Answer:- Option D
Question:- The property of a substance to absorb moisture from the air on exposure is called A. osmosis B. deliquescence C. efflorescence D. desiccation
Answer:- Option B
Question:- in which of the following activities silicon carbide is used? A. Making cement and glass B. Disinfecting water of ponds C. cutting very hard substances D. Making casts for statues
Answer:- Option C
Question:- The average salinity of sea water is A. 3% B. 3.5% C. 2.5% D. 2%
Answer:- Option B
Question:- When an iron nail gets rusted, iron oxide is formed A. without any change in the weight of the nail B. with decrease in the weight of the nail C. with increase in the weight of the nail D. without any change in colour or weight of the nail
Answer:- Option C
Question:- Galvanised iron sheets have a coating of A. lead B. chromium C. zinc D. tin
Answer:- Option C
Question:- Among the various allotropes of carbon, A. coke is the hardest, graphite is the softest B. diamond is the hardest, coke is the softest C. diamond is the hardest, graphite is the softest D. diamond is the hardest, lamp black is the softest
Answer:- Option C
Question:- The group of metals Fe, Co, Ni may best called as A. transition metals B. main group metals C. alkali metals D. rare metals
Answer:- Option A
Question:- Heavy water is A. deuterium oxide B. PH7 C. rain water D. tritium oxide
Answer:- Option A
Question:- The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of A. bromine B. fluorine C. chlorine D. sulphur
Answer:- Option D
Question:- The element common to all acids is A. hydrogen B. carbon C. sulphur D. oxygen
Answer:- Option A
Question:- Non stick cooking utensils are coated with A. Teflon B. PVC C. black paint D. polystyrene
Answer:- Option A
Question:- Non stick cooking utensils are coated with A. Teflon B. PVC C. black paint D. polystyrene
Answer:- Option A