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मंगलवार, 26 दिसंबर 2017

GK chemistry, Science GK Questions Answers

Q1.Who developed Hydrogen Bomb?
Ans-Edward Teller

Q2.Who developed atom bomb?
Ans-J. Robert Oppenheimer

Q3.What is the most commonly used substance in fluorescent tubes?
Ans-Mercury vapor and argon

Q4.What is “milk magnesia” chemically?
Ans-Magnesium hydroxide

Q5.Diamonds are glittering and attractive because light incident on them undergoes
Ans-Multiple internal reflections

Q6 .Browning of paper in old books is caused by
Ans-oxidation of cellulose

Q7.The process of improving the quality of rubber by heating it with sulfur is called

Q8.The gas that causes suffocation and death when coal or coke is burnt in a closed room is
Ans-Carbon monoxide

Q9.Atoms having the same number of protons but different number of neutrons are called

Q10.An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a

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.The fat of a common mussel-secretes a sticky glue that can be used to make heart implants.The unique chemical compound present in the glue is
Ans-Dihydroxy phenylalanine

Q16.When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state.On coming back to the lower energy state, they emit light, which we can observe in
Ans-Emission spectra

Q17.Exposure to mixtures of chemicals is greater than expected on the basis of effects of exposure to each chemical individually.This is known as

Q18.The effector response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as

Q19.The open ‘Sigrees’ or coal stoves often require fanning to sustain burning because of
Ans-Tendency of carbon dioxide to form a layer along with dust smoke

Q20.What is the chemical name for ‘baking soda’?
Ans-Sodium bicarbonate

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