2456: The national highway from Delhi to Calcutta via Mathura and Varanasi is numbered
(a) 1
(b) 2
(c) 4
(d) 8
2457: The chemical used as a 'fixer' in photography is
(a) sodium sulphate
(b) sodium thiosulphate
(c) ammonium persulphate
(d) borax
2458: "Red Shirts" movement aimed at
(a) To throw out Britishers from India
(b) To promote Communist organisational activities
(c) To promote trade union activities
(d) All of the above
2459: Seasonal migration of men and animals from lower to higher altitudes during the summer is known as
(a) Nomadism
(b) Migration
(c) Transhumance
(d) Pastoralism
2460: According to Meadows (1972), if the present trends in world population, industrialisation, pollution, food production and resource depletion continue unchanged, the Limits to Growth on our planet will be reached in the next
(a) 50 years
(b) 100 years
(c) 150 years
(d) 200 years