186: Tropical rain forests appear in which of the following regions?
(a) South America, South Africa and Central Europe
(b) Central America, parts of Australia, Guinea Coast
(c) Congo basin, Central America, South East Asia
(d) North and South of the Congo basin
187: Contour bunding is used:
(a) To stop the winds in sandy deserts
(b) To irrigate desert areas
(c) To prevent erosion in hilly areas
(d) None of the above
188: What does the term Dolby B, or Dolby C printed on tape recorders and other sound system refer to?
(a) Frequency modulated system
(b) Amplitude modulated system
(c) Noise reduction circuit
(d) Both DC and AC power can be used.
189: Transchart is the
(a) chartering wing of the Ministry of Surface Transport
(b) container service established by Indian Railways
(c) training institute of maritime studies and research
(d) passenger insurance scheme of Indian Railways
190: The missing fraction in the series given below is :
4/9,9/90/........39/86
(a) 17/40
(b) 19/42
(c) 20/45
(d) 29/53