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_____most important deed was his imposition of a refined tax system.
A) Akbar's                          
B) Babur's
C) Shah Jahan's  
D)  Jehangir's


Cartography is the technique of …….
A) Making designs                             
B) Comparison of quantitative data
C) Map-making
D) Representation of statistical data


Isobars have the same:
A) Mass number
B) Atomic number
C) Neutrons                         
D) None of  these


What is the approximate share of Oxygen in the air? 
A) 21%                                
B) 30%
C) 15%                                 
D) 17%


Which two gases when dissolved in rainwater produce acid rain? 
A) Sulfur dioxide and Nitrogen
B) Nitrogen dioxide and Sulfur dioxide
C) Carbon dioxide and Argon
D) Nitrogen oxide and Oxygen


The transfer of pollen grains from the stamen to the stigma of the same flower or to the different flower of the same  plant is called:
A) Self - pollination          
B) Cross - pollination
C) Application    
D) Fertilization