21: The principal cause of soil damage in Punjab and Haryana is:
(a) Salinity and water-logging
(b) Deforestation
(c) Ravine erosion
(d) Overgrazing
22: 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
23: Among the four pairs given below which one consists of a correct combination of dignitaries who became Vice-Presidents after having held diplomatic posts like Ambassadors and High Commissioners?
(a) Dr. S. Radhakrishnan and G.S. Pathak
(b) Dr. S. Radhakrishnan and V.V. Giri
(c) Dr. Zakir Hussain and K.R. Narayanan
(d) B.D. Jatti and K.R. Narayanan
24: It takes one minute to fill 3/7 th of a vessel. What is the time taken in minutes to fill the whole of the vessel ?
(a) 4/3
(b) 3/4
(c) 7/3
(d) 3/2
25: The national highway from Delhi to Calcutta via Mathura and Varanasi is numbered
(a) 1
(b) 2
(c) 4
(d) 8