671. In which situation a chemical reaction does not?
Common salt is exposed to air
672. Who is the author of "Unhappy India"?
Lala Lajpat Rai
673. Which States of the U.S.A. are attached to Mexico?
California and Texas
674. During the time of Harshavardhana; where was a great Buddhist assembly held?
Prayag
675. In the Delhi Sultanate; the work of 'Mustauf-i-Mamalik' was related to which?
Auditing
676. Which is the official publication of Kerala Sports Council?
'Kayikavedi'
677. Which is the largest dam in the world?
Three Gorges Dam built across the Yangtse river in China
678. The main chemical content of egg shell is ?
calcium carbonate.
679. Global Polio Eradication Programme is a Joint effort led by WHO; UNICEF and ?
The Rotory Foundation.
680. Longest Railway Bridge?
Huey P. Long Bridge; 7009 m (Metairie; Louisiana; USA)