211: In many developing countries, three major causes of death and disease are
(a) lack of safe drinking water, increasing use of pesticides and thinning of the ozone layer
(b) contaminated food, global warming and industrial chloro-fluoro-carbons
(c) polluted air, greenhouse effect and soil erosion
(d) dirty water, contaminated food and polluted air
212: In the context of the organic evolution, the loss of limbs of snakes is explained by the phenomenon of
(a) use and disuse of organs
(b) adaptation to living in burrows
(c) natural selection
(d) inheritance of acquired characters
213: Which of the following special powers have been conferred on the Rajya Sabha by the Constitution of India?
(a) To change the existing territory of a State and to change the name of a State
(b) To pass a resolution empowering the Parliament to make laws in the State List and to create one or more All India Services
(c) To amend the election procedure of the President and to determine the pension of the President after his/her retirement
(d) To determine the functions of the Election Commission and to determine the number of Election Commissioners
214: When water is heated from zero Degree Celsius to Ten Degree Celsius, its volume
(a) increases
(b) decreases
(c) does not change
(d) first decreases and then increases
215: A and B start from the same point and in the same direction at 7 a.m. to walk around a rectangular field 400 m x 300 m. A and B walk at the rate of 3 km/hr and 2.5 km/hr respectively. How many times shall they cross each other if they continue to walk till 12 : 30 p.m?
(a) Not even once
(b) Once
(c) Twice
(d) Thrice