Science- Paper-III
This paper contains 25 questions. All questions are compulsory. Each question carry 2 marks. Max. time to complete this paper is 30 minutes.
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1. An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is: *
2 points
2. A ray of light that strikes a plane mirror PQ at an angle of incidence of 30o, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: *
2 points
3. An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is: *
2 points
4. Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used? *
2 points
5. A concave mirror produces a magnification of +4. The object is placed: *
2 points
6. Every food chain in the ecosystem begins with………. which are the original source of food. *
2 points
7. We should reduce the use of the plastic bags, bottles etc. because: *
2 points
8. Which among the following statements is incorrect in view of the plants? *
2 points
9. In a food chain the second trophic level is occupied by: *
2 points
10. Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone? *
2 points
11.  An electric motor is a device which transforms *
2 points
12.  What is the ancient name for all human beings? *
2 points
13. The organs present in two organisms indicate that they are derived from the same ancestor are: *
2 points
14. Which of the following pair of organ is not homologous? *
2 points
15. While cooking, if the bottom of the vessel is getting blackened on the outside, it means that: *
2 points
16. Cation is formed when: *
2 points
17. The property of self-linkage among identical atoms to form long chain compounds is known as: *
2 points
18.  Which of the following statements about graphite and diamond is true? *
2 points
19.  How many number of carbon atoms are joined in a spherical molecule of buckminsterfullerene? *
2 points
20. Which of the followings is the major constituent of the liquefied petroleum gas? *
2 points
21. From which of the following substance pencil lead is formed? *
2 points
22. Rozly can row downstream 20km in 2 hours, and the upstream 4km in 2 hours. What will be the speed of rowing in still water? *
2 points
23. Among the following choose the correct option which contains only biodegradable items?   I. Wood, paper, PVC      II. Paper, seeds, detergent       III. Paper, animal excreta, woodiv. Wool, leaves, paper *
2 points
24. Having two eyes facilitates in:          A: Increasing the field of view                  B: Bringing three dimensional view                  C: Developing the concept of distance/size.                  Then the correct option is/are: *
2 points
25. Five years ago, A was thrice as old as B and ten years later, A shall be twice as old as B. What is the present age of A. *
2 points
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