Tank-irrigation is commonly found is south-central parts of India.What could be the reason?

1.Insufficent shallow ground water

2.Rocky plateau with impervious surface depression

3.Undulating terrain helps in accumulating rain water in depression or man-made tank

Select the correct answer

Who among the following proposed that atom is indivisible?

Match List I with List II and select the correct answer using the codes below

    List I                                  List II

A)Llanos                              1.Australia

B)Priaries                            2.Venezuala

C)Pampas                            3.USA

D)Downs                              4.Argentina

Code

A               B              C                 D

Which among the following is the most appropriate and correct practise from the point of view of healthy environment?

Which one of the following metals are prominently used in mobile phone batteries?

An electron and a proton are circulating with the same speed in circular paths of equal radius.Which one among the following will happen,if mass of  a proton is 2000 times that of the electron?