51: Radioactive element which has been found to have large reserves in India is:
(a) Thorium
(b) Uranium
(c) Radium
(d) Plutonium
52: With reference to the mineral resources of India, consider the following pairs:
Mineral : 90% Natural sources in
1. Copper : Jharkhand
2. Nickel : Orissa
3. Tungsten : Kerala
Which of the pairs give above is/are correctly matched?
(a) 1 and 2 only
(b) 2 only
(c) 1 and 3 only
(d) 1, 2 and 3
Explanation:
Bihar and Jharkhand (44%) and Rajasthan (20%)
Nickel : Most of nickel reserves of India (92%) are found in Cuttack, Keonjhar and Mayurbhanj districts of Orissa.
Tungsten : Produced in Degana mine in Rajasthan.
53: Biodiversity forms the basis for human existence in the following ways:
1. Soil formation
2. Prevention of soil erosion
3. Recycling of waste
4. Pollination of crops
Select the correct answer using the codes given below:
(a) 1, 2 and 3 only
(b) 2, 3 and 4 only
(c) 1 and 4 only
(d) 1, 2, 3 and 4
54: An objective of the National Food Security Mission is to increase the production of certain crops through area expansion and productivity enhancement in a sustainable manner in the identified districts of the country. What are those crops ?
(a) Rice and Wheat only
(b) Rice, Wheat and pulses only
(c) Rice, wheat, pulses and oil seeds
(d) Rice, Wheat, pulses, oil seeds and vegetables
Explanation:
The National Development Council (NDC) in its 53rd meeting held on 29th May, 2007 adopted a resolution to launch a Food Security Mission comprising rice, wheat and pulses to increase the production of rice by 10 million tons, wheat by 8 million tons, and pulses by 2 millions tons by the end of Eleventh Plan (2012012) Accordingly, a centrally sponsored scheme, National Food Security Mission has been launched from 2007-08 to operationalize the above mentioned resolution.
55: Forest areas have been labelled as 1, 2, 3 and 4 in the rough outline map given:
Among these, those which were threatened in 1997 by a serious epidemic include
(a) teak forests of 3 and 4
(b) oaks forests of 1 and sal forests of 2
(c) sal forests of 3
(d) sandalwood forests of 4
Explanation:
The place marked '3' indicates sal trees of Madhya Pradesh. They were affected in 1997 by the insects.