531. Who is the inventor of Pressure Cooker?
Dennis Papin Robert Boyle
532. Which is the maximum spoken language in the world?
Mandarin
533. Which environment leads to the occurrence of acid rain?
Sulphur dioxide
534. Bryology is the study of ?
Mosses; liverworts; and hornworts
535. Which Mahajanapada was situated on the bank of river Godawari ?
Assaka
536. Which is the most important factor in soil formation?
Climate
537. The Punnapra Vayalar Upheaval was a strike against?
The American Model irremovable executive.
538. Which place is known as Rajendra Chola Pattanam?
Vizhinjam
539. Where was the first Jews Synagogue in Kerala built?
Mattancherry.
540. Of which bills Open market operations of a Central Bank are sale and purchase?
Trade bills