641: Diffusion of light in the atmosphere takes place due to
(a) Carbon dioxide
(b) Dust particles
(c) Helium
(d) Water vapours
642: The discovery of Oak flora in 1966 added a new chapter to the history of Indian Sericulture. Which one of the following states is the leading producer of Oak tasar silk ?
(a) Assam
(b) Bihar
(c) Manipur
(d) Orissa
643: Consider the following statements :
At the present level of technology available in India, solar energy can be conveniently used to
I. supply hot water to residential buildings.
II. supply water for minor irrigation projects.
III. provide street lighting.
IV. electrify a cluster of villages and small towns.
Of these statements
(a) I, II, III and IV are correct.
(b) II and IV are correct
(c) I and III are correct
(d) I, II and III are correct
644: During the Indian Freedom Struggle, who of the following raised an army called 'Free Indian Legion' ?
(a) V. D. Savarkar
(b) Rashbehari Bose
(c) Lala Hardayal
(d) Subhas Chandra Bose
645: Consider the following :
I. Market borrowing
II. Treasury bills
III. Special securities issued to RBI
Which of these is/are component(s) of internal debt ?
(a) I only
(b) I and II
(c) II only
(d) I, II and III