Q11-German silver is an alloy of
Ans-zinc, copper, and nickel
Q12.What is the name of that system, which uses radioactivity to decide the period of materials of-pre-his-toric period?
Ans-Carbon dating
Q13.What happens when a chemical bond is formed?
Ans-Energy is always absorbed
Q14.Where does the oxygen that keeps us alive come from?
Ans-Water
Q15.What is the chemical name for ‘baking soda’?
Ans-Sodium bicarbonate
Q16.Who developed Hydrogen Bomb?
Ans-Edward Teller
Q17.Who developed atom bomb?
Ans-J. Robert Oppenheimer
Q18.What is the most commonly used substance in fluorescent tubes?
Ans-Mercury vapor and argon
Q19.What is “milk magnesia” chemically?
Ans-Magnesium hydroxide
Q20.Diamonds are glittering and attractive because light incident on them undergoes
Ans-Multiple internal reflections
I’m Nitesh Brithwal Nanu , An Indian Engineer who is passionate about technology , current affairs , general Knowledge & programming . Constantly learning and experiencing new things.
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