221: Which one of the following countries has tricameral legislature with one House for ethnic group?
(a) South Africa
(b) Sri Lanka
(c) Fiji
(d) Malaysia
222: Mixed cropping is useful when:
(a) Crops with varying maturity periods are sown together
(b) Crops with same maturity period are sown together
(c) Different soils are used for the same crops
(d) Crops with different nutritional requirements are grown
223: The most reactive among the halogens is
(a) fluorine
(b) chlorine
(c) bromine
(d) iodine
224: A trader loses 20 per cent by selling an article for Rs. 480. If he is to gain 20 per cent, he should sell it for rupees ______
(a) 520
(b) 600
(c) 720
(d) 800
225: Recently "oilzapper" was in the news, What is it?
(a) It is the latest technology to control the accidentally caused flames from oil wells
(b) It is an eco-friendly technology for the remediation of oily sludge and oil spills
(c) It is the latest technology developed for under-sea oil exploration
(d) It is a genetically engineered high biofuel-yielding maize variety