2761: A and B can complete work together in 5 days. If a works at twice his speed and B at half of his speed this works can be finished in 4 days. How many days would it take for A alone to complete the job ?
(A) 18
(B) 10
(C) 12
(D) 15
2762: Physico-chemical characteristics of water in water sources undergo changes due to
(a) aquatic macrophytes
(b) aquatic fungi
(c) effluents
(d) evapotranspiration
2763: When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
(a) reflection and diffraction
(b) reflection and transmission
(c) diffraction and transmission
(d) refraction, diffraction and transmission
2764: Pradhan Mantri MUDRA Yojana is aimed at
(a) bringing the small entrepreneurs into formal financial system
(b) providing loans to poor farmers for cultivating particular crops
(c) providing pensions to old and destitute persons
(d) funding the voluntary organizations involved in the promotion of skill development and employment generation
2765: Which of the following minerals are found in a natural way in the State of Chhattisgarh ?
1. Bauxite
2. Dolomite
3. Iron ore
4. Tin
Select the correct answer using the code given below:
(a) 1 and 3 only
(b) I, 2,3 and 4
(c) 1, 2 and 3 only
(d) 2 and 4 only