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?

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

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nanu brithwal

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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