626: Hygrometer is used to measure:
(a) Density of a liquid
(b) Relative humidity of atmosphere
(c) Absorption power of plants
(d) Temperature of air
627: Epiphytes are plants which depend on other plants for
(a) food
(b) mechanical support
(c) shade
(d) water
628: Who among the following started the newspaper Shome Prakash ?
(a) Surendranath Banerjee
(b) Ishwar Chandra Vidyasagar
(c) Raja Rammohan Roy
(d) Dayanand Saraswati
629: Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?
(a) Hydrogen and oxygen
(b) Oxygen and acetylene
(c) Methane and air
(d) Carbon dioxide and methane
630: In which one of the following places the boiling point of water is the highest?
(a) Dead Sea
(b) Mt. Everest
(c) Nile delta
(d) Sunderban delta