CBSE-XII-2014 CBSE Board CHEMISTRY Paper & Solution Code : 56/3 Time : 3 Hrs. Max. Marks : 70 General Instructions : (i) All questions are compulsory. (ii) Questions number 1 to 8 are very short answer questions and carry 1 mark each. (iii) Questions 9 to 18 are short answer questions and carry 2 marks each. (iv) Question number 19 to 27 are also short-answer questions and carry 3 marks each. (v) Question number 28 to 30 are long-answer questions and carry 5 marks each. (vi) Use Log Tables, if necessary. Use of calculators is not allowed
Physics Paper & Solution Code : 55/3 Time : 3 Hrs. Max. Marks : 70 General Instruction : (i) All questions are compulsory. (ii) There are 30 questions in total. Questions 1 to 8 are very short answer type questions and carry one mark each. (iii) Questions 9 to 18 carry two marks each, questions 19 to 27 carry three marks each and questions 28 to 30 carry five marks each. (iv) One of the questions carrying three marks weightage is value based question (v) There is not overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three question of five marks each weightage. You have to attempt only one of the choices in such question Courtesy: Career Point
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Class-XIISubject- English (Core) Read the passage carefully and answer the questions that follow : 12 1. Too many parents these days can't say no. As a result, they find themselves raising children who respond greedily to the advertisements aimed right at them. Even getting what they want doesn't satisfy some kids; they only want more. Now, a growing number of psychologists, educators and parents think it's time to stop the madness and start teaching kids about what's really important : values like hard work, contentment, honesty and compassion. The struggle to set limits has never been tougher - and the stakes have never been higher. One recent study of adults who were overindulged as children, paints a discouraging picture of their future : when given too much too soon, they grow up to be adults who have difficulty coping with life's disappointments. They also have a distorted sense of entitlement that gets in the way of success in the workplace and in relationships. Courtesy: Career Point
Summative Assessment - II Class X Science 2014 Board paper solution 31_2 1. Atomic no. of x = 12; Atomic No. of y = 16 2. The transfer of traits from parents to offspring is called heredity. 3. Paper and glass can be easily recycled but thrown in the dust bin. 4. This is because both the father and the mother contribute practically equal amounts of genetic material to the child during sexual reproduction in forming ztgote. 5. Object placed between pole and focus see in diagram: 6. Decomposer break-down the complex organic substances into simple inorganic substances. The natural replenishment of the soil also takes place by Decompose. 7. Watershed management is the study of the characteristics of a watershed. It helps to manage water quality, water supply, and drainage and rainwater flow. It also ensures sustainable maintenance planning of a watershed. Benefits of a watershed management system: Water quality is strictly maintained. Distribution of water is equal and sustainable. 8. The producers convert solar energy into chemical energy in the form of organic compounds. The primary consumers (herbivores) derive their nutrition from the producers. According to the energy transfer law, only 10% of energy is transferred from one trophic level to the other. So, the energy that is captured by the producers does not revert back to the Sun and the energy transferred to the herbivores does not come back to the producers. It just keeps on moving to the next trophic level in a unidirectional way. That is why the flow of energy in the food chain is always unidirectional. A large number of pesticides and chemicals are used to protect our crops from pests and diseases. Some of these chemicals are washed down from the soil, while some enter the water bodies. From the soil, they are absorbed by plants along with water and minerals; and from the water bodies, they are taken up by aquatic plants and animals. This is how these chemicals enter the food chain. As these chemicals cannot decompose, they accumulate progressively at each trophic level. This increase in the concentration of harmful chemicals with each step of the food chain is called biomagnification. As human beings occupy the top level in any food chain, these chemicals get accumulated in our bodies. 10. (a) He should use a concave mirror, as it forms a real image on the same side of the mirror. (b) Object distance, u = -12 cm image distance, v = - 48 cm Magnification, m = -vu = -(-48)(-12) = -4 The minus sign in magnification shows that the image formed is real and inverted. (c) The image is formed at a distance of 36 cm from the object. (d) In this case, the image is formed beyond the centre of curvature. This image is real, inverted and enlarged. 11. (i) The phenomena of the splitting of the white light into its constituents colours is called dispersion of the light. Therefore, the phenomena observed is dispersion of light. The dispersion of light is caused, because different constituent colours of light offers different refractive index to the material of the prism. (ii) The formation of rainbow is caused by the dispersion of white sunlight into its constituents colours. (iii) Based on the dispersion of white light into its constituent colours we conclude that: (a) White light consists of seven colours. (b) The violet light suffers the maximum deviation and red light suffers the minimum deviation 12. Given: C2H4O2 + RCH2OH →H+X RCH2OH →H+KMnO4 C2H4O2 Chemical reactions involved: CH3COOH + C2H5OH → H+ CH3COOC2H5 C2H4O2 Alcohol X C2H5OH →H+KMnO4 CH3COOHAlcohol (i) The carboxylic acid involved in the reaction is acetic acid (CH3COOH). (ii) The alcohol involved in the reaction is ethanol (CH3CH2OH). (iii) X is the ester formed by the condensation of acetic acid, and ethanol is ethyl acetate (CH3COOC2H5) MCQS 25. (C) Convex lens of focal length 20 cm. 26. (B) Concave and F1 > F2 27. (D) 2, 3 and 4 28. (C) 20 cm on the other side of the lens and is of the same size, real and inverted. 29. (D) Y, Q and P 30. (B) Q 31. (C) ∠r only 32. (C) III 33. (A) Plumule, Cotyledon, Radicle 34. (D) Radish and carrot 35. (C) III and IV 36. (C) III, II, I, IV 37. (B) II, I, IV, III 38. (A) 2, 3 and 5 39. (D) I, II and IV 40. (B) the ethanoic acid dissolves readily in water. 41. (C) White pellets/flakes 42. (A) the reaction is exothermic and the reaction mixture is acidic. SECTION A All questions are similar in 30/1 set SECTION B All questions are similar in 30/2 set except Q.No. 1414. Find the value of p so that p x (x-3)+9 = 0 has equal roots. SECTION C All questions are similar in 30/2 set except Q. No. 20,22,23,2420. Construct a triangle with side 5 cm, 5.5 cm and 6.5 cm . Now construct another triangle, whose sides are 3/5 times the corresponding sides of given triangle. 22. The sum of first seven term of AP is 182. If 4th and 17th term are in ratio 1: 5 . Find AP 23.From the top of 60m high building , the angle of depression of the top and bottom of a tower are 450 and 600 respectively. Find the height of tower. 24.Find a point p on y axis which is equidistant from points A(4,8)and B(-6,6) SECTION D All questions are similar in 30/2 set except Q.No.31, 32 and 34 31. (x – 4) / (x – 5 )/ (x – 6) / (x – 7 ) = 10/3 32. Five cards – the ten, jack ,queen king and ace of diamonds are are well suffled with their faces downward . one card are drawn randomly (a)what is the probability that the drawn card is the queen (b)If the queen is drawn and put aside , and a second card id drawn . find the probability that the second card is (i) an ace (ii) a queen 34. In fig. , A triangle ABC is drawn to circumscribe a circle of radius 4 cm , such that the segment BD and DC are of length 8 cm and 6 cm respectively. Find the side AB and AC
Maths class 10 CBSE Board Paper 2014 solution Section A and B (code 30_2)
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