686: Who was Leander Paes's partner when he won Doubles Final in the US Open Tennis Tournament 2006 ?
(A) Mike Bryan
(B) Bob Bryan
(C) Martin Damm
(D) Max Mirnyi
687: Who among the following is said to have witnessed the reigns of eight Delhi Sultans?
(a) Ziauddin Barani
(b) Shams-i-Siraj Afif
(c) Minhaj-us-Siraj
(d) Amir Khusrau
688: Arrange the following Buddhist councils in a chronological order:
(1) Vaishali
(2) Rajagraha
(3) Patliputra
(4) Sreenagar
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(a) 1, 4, 3, 2
(b) 3, 2, 1, 4
(c) 4, 1, 2, 3
(d) 2, 1, 3, 4
689: Acid precipitation is now regarded as a serious problem in some European and Asian countries. Its major cause or source is
(a) discharge of acidic effluents onto neutral or slightly alkaline land where the acidic components precipitate
(b) emissions of sulphur oxides and nitrogen oxides from thermal power plants and burning of fossil fuels; these oxides dissolve in atmospheric water vapour and fall back on earth as acid rain
(c) natural carbon dioxide released during respiration of living organisms dissolves in water, forming carbonic acid which is the chief contributor to acidity in rain water
(d) chloro-fluoro-carbons readily react with various chemicals near the earth's surface, producing acidic intermediates which cause acid precipitation
690: In which of the following relief sculpture inscriptions is Ranyo Ashoka (King Ashoka) mentioned along with the stone portrait of Ashoka?
(a) Kanganahalli
(b) Sanchi
(c) Shahbazagrhi
(d) Sohgaura