The Sun produces most of its energy by_____________
(A) Nuclear fusion
(B) nuclear fission
(C) Burning hydrogen
(D) None of these
Primary cosmic rays are composed largely of very fast__________
(A) Protons
(B) Neutrons
(C) Electrons
(D) Gamma rays
The time taken by Sun to revolve around the center of our galaxy is___________
(A) 150 million years
(B) 250 million years
(C) 300 millon years
(D) 350 millon years
The average length of the kidney of a man is about
(A) 7cm to 8cm
(B) 8cm to 10 cm
(C) 10cm to 13 cm
(D) 13cm to 16cm
Summer solstice means__________
(A) longest day
(B) longest night
(C) smallest day
(D) none of these
Winter Solstice means____________
(A) longest night
(B) longest day
(C) smallest night
(D) smallest day