26: Farm land tends to erode most rapidly when planted with
(a) sorghum
(b) potato
(c) wheat
(d) clover
27: What number comes next?
4, 196, 16, 144, 36, 100, 64,...
(a) 36
(b) 100
(c) 80
(d) 64
28: If a block of gold weighing 100 gm in air is immersed in water with a string tied to a spring balance, what could be the probable weight indicated by the spring balance?
(a) Less than 100 gm
(b) Equal to 100 gm
(c) More than 100 gm
(d) Double of 100 gm
29: Which one of the following is the correct sequence of the given Indian cities in the decreasing order of their normal annual rainfall?
(a) Kochi - kolkata - Delhi - Patna
(b) kolkata - Kochi - Delhi - Patna
(c) Kochi - kolkata - Patna - Delhi
(d) kolkata - Kochi - Patna - Delhi
30: Which one of the following groups of plants was domesticated in the New World and introduced into the 'Old World'?
(a) Tobacco, cocoa and rubber
(b) Tobacco, cotton and rubber
(c) Cotton, coffee and sugarcane
(d) Rubber, coffee and wheat