First Published: May 20, 2009 | Last Updated:August 4, 2020
Watch Video Here
Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential. Hydrogen has about 8% more buoyancy than helium . Both provide about 9.8 N of lift (the force to lift 1 kg) per cubic meter of gas at room temperature and sea level pressure. Helium is preferred because it is not combustible.
It is really interesting to learn through Multiple choice questions. Will be helpful in preliminary examination point of view also. Thanks!!
a great effort,it is quite beneficial for GKthkx
Thanks a lot for all your sincere effort that you make please keep in posting more.
thanks for publishing this kind of GK………..plz keep posting more n more on advanced science n technology……….thanx!!!!!
thank u very much for this valuable informations….
a doubt sir…
Question number 3.. based on your explanation, Hydrogen is the lightest gas-right ?
but the answer that gets displayed is different.. do clarify..
thank you and i want more objective question and answers in History of india and indian geography which will be very helpful to get success in railway exams. please do the needful for me.regards moin
present iam preparing for railway exams non-technical cadre so please send objective question and answers on indian history and indian geography to get success.
this is wonderful site i have ever experienced and i am learning very well and i am spending lot of time by studying through this site. thank you very much.regards moin
thanq very much for ur valuable information
sir plz elaborate the ans of q 3
Answer to Question 8 is wrong.
Spleen is the reservoir (creator) of RBC not the destroyer.
Mr Arpit, bone marrow is creator of RBC, but spleen is the selective destroyer. I think 8 is right.
I think Q.9 is incorrect. Rainfall in W.Bengal, Bihar and eastern UP in the non-Monsoon season is due to tropical cyclonic circulations. The Western Disturbances bring rainfall in J&K, Punjab, Delhi and western UP during January-February.
Reply to Arpit Srivastava regarding Q.8:
The spleen is known as the GRAVEYARD of RBC. IT is where the RBC are destroyed upon the completion of their 120 days life cycle. Hence, the answer to Q.8 is correct.
Reply to Arpit and Ps:
It is true that the spleen is reservoir of RBC but it is clear form the question that It selectively destroy the RBC when its life is over. It is told to be reservoir because in case of too bleeding it supplied the necessary blood.
Answer for question 3 should be increase because fundamentally it will increase 1.5 times.
thanks for this great effort….god bless u
THIS IS VERY GOOD PLACE IS KI BAJAH SE AAJ MAIN KISI BHI EXAM MAIN GK MAIN NAHIN DARTA HOON AND IS K KARAN HI MAIN 80% ANSWER DETA HOON SO HIS IS ULTIMATE
Its lovely, I think if we solve more than 100 questions per day then we don’t need to read extra for competitive examinations except UPSC.
I would like to thanks the whole team who managed and operating this site.
This Was Very Useful To Me And All Thank You Very Much.
tnks guys its very useful
very useful , thanx gktoday
Great efforts goid job admin g
thanks for this great
effort… very interesting.
Very interesting gk
thanks for ur valuable questions with answers…
it will always helps student for quiz copetition…
gave me lots of new info. :)
more valuable questions to know as a member of this word
good knowledge of GK for adults