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2641: Which one of the following organisms can serve as a bio-fertilizer for rice crop?

(a) Blue green algae
(b) Rhizobium sp
(c) Mycorrhizal fungi
(d) Azotobacter sp
2642: The dimensions of a rectangle are 51 m and 49 m respectively while side of a square is 50 m. Which of the following statements is correct?

(a) Diagonals of the square and the rectangle are equal

(b) Diagonals of both the geometrical figures intersect at right angles

(c) The perimeters of both the geometrical figures are equal

(d) Both the geometrical figures are of the same area
2643: Pampas are the vast grassy plains of:

(a) South America

(b) North America

(c) Africa

(d) Eurasia
2644: Due to improper/indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste?

1. Beryllium
2. Cadmium
3. Chromium
4. Heptachlor
5. Mercury
6. Lead
7. Plutonium

Select the correct answer using codes given below.

(a) 1, 2, 3, 5 and 6 only
(b) 2, 4, 5 and 7 only
(c) 1, 3, 4, 6 and 7 only
(d) 1, 2, 3, 4, 5, 6 and 7
2645: Musical instrument used by Amir Khusro was:

(a) Sitar

(b) Sarod

(c) Tabla

(d) Flute
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