871: The original inhabitants of India are believed to be of the ethnic type known as
(a) Negrito
(b) Proto-Australoids
(c) Mongoloids
(d) Dravidians
872: Which one of the following statements is not correct?
(a) The presence of NaCl increases the rate of setting of Plaster of Paris
(b) Gypsum is added to the cement to slow down its rate of setting
(c) All alkaline earth metals form hydrated salts
(d) Barium and Strontium are found free in nature
873: Why the Indian farmers plough their fields during the time interval between two crops?
(a) In order to keep the soil loose for further cultivation
(b) To increase the porosity of the soil
(c) To escape drought
(d) To prevent clodding
874: Which one of the following is the correct statement on the basis of Census 2001?
(a) Bihar has the highest percentage of the Scheduled Caste of its population
(b) The decadal growth of population of India (1991-2001) has been below 20%
(c) Mizoram is the Indian State with the least population
(d) Pondicherry has the highest sex ration among the Union Territories
875: Consider the following figures :
Which one of the following conclusion can be drawn from these figures ?
(a) The areas of the three figures are all different
(b) The areas of all the three figures are equal
(c) The perimeters of the three figures are equal
(d) The perimeters of figures I and II are equal