Page 1 of 14
SUMMATIVE ASSESSMENT II, II SCIENCE / Class X / X Time allowed : 3 hours Maximum Marks : 80 3 80 General Instructions : The question paper comprises of two Sections, A and B. You are to attempt both the sections. All questions are compulsory. (iii) There is no overall choice. However, internal choice has been provided in all the five questions of five marks category. Only one option in such questions is to be attempted. (iv) All questions of Section-A and all questions of Section-B are to be attempted separately. (v) Question numbers 1 to 4 in Section-A are one mark questions. These are to be answered in one word or in one sentence. (vi) Question numbers 5 to 13 in Section-A are two marks questions. These are to be answered in about 30 words each. (vii) Question numbers 14 to 22 in Section-A are three marks questions. These are to be answered in about 50 words each. (viii) Question numbers 23 to 25 in Section-A are five marks questions. These are to be answered in about 70 words each. (ix) Question numbers 26 to 41 in Section-B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you. (iii) (iv) (v) 1 4 (vi) 5 13 30 (vii) 14 22 50 (viii) 23 25 70 (ix) 26 41 Page 2 of 14
SECTION-A / 1. Draw the structure of benzene, (C 6 H 6 ). (C 6 H 6 ) 2. A person suffering from an eye-defect uses lenses of power - 1D Name the defect he is suffering from and the nature of lens used. 1D 3. In the following food chain, grass provides 4000J of energy to the grasshopper. How much energy will be available to snakes and frogs? GRASS --- GRASSHOPPER FROGS SNAKES न म ख द य श र खऱ म घ स स dट ड ड y addd क 4000J ऊर प र प त ह त ह म ढ़क और स प क क रम श: टकत ऊर नम ऱत ह? 4. What is meant by non-biodegradable waste? Identify biodegradable waste from the following : Empty packet of chips, Empty plastic bottle of mineral water, Empty paper box of sweets, Empty tin of a cold drink. अर वन म oकरण य अपनशष टa टकन हह कहत ह? न म म स र वन म iकरण य अपनशष टÏ पहच न य नचप सस क ख ऱ प क, खन र र ऱ(नम रऱ व र) क ख ऱ सऱ प ट क क ब तऱ, नम ठ ई क ख ऱ गत त क टडब ब, टकस ठ ड प य क ख ऱ ट. 5. If an element belongs to group 14 in the periodic table, what will be its valency? Answer with reason. How many shells are present in all the elements of first period? Give one reason for your answer. 14 6. If an element has atomic number 18, mention the group to which it belongs? Answer with reason. How many groups and periods are there in the modern periodic table? 18 7. What is vegetative propagation? List its any two advantages. 8. Give functions of the following organs of the human male reproductive system. Scrotum Testes Page 3 of 14
9. You are provided with two lenses of focal length 10 cm and 20 cm. Which of the two lenses would you suggest to obtain greater convergence of refracted light? Justify your choice. 10 cm 20 cm 10. An old person is unable to see clearly nearby object as well as distant objects What defect of vision is he suffering from? What kind of lens will be required to see clearly the nearby as well as distant objects? Give reasons? 11. What is dispersion of light? Name the component of white light that deviates the least, component of white light that deviates the most, while passing through a glass prism. 12. List any four human activities responsible for the pollution of river water. 13. List any four ways of conserving fossil fuels. 14. What is Vinegar? State its one use. Which gas is produced when dilute ethanoic acid is added to sodium bicarbonate? How will you test the presence of this gas? Page 4 of 14
15. Group 1 Group 16 X A Y B Z - M D Giving reasons, explain the following : Element M has largest atomic size as compared to the other elements, X, Y, Z shown in Group 1 of the section of periodic table shown above. Element A has valency of 2. (c) Elements A, B and D are non metals. Group 1 Group 16 X A Y B Z - M D M X, Y, Z A 2 (c) A, B, D 16. Draw a diagram showing the fertilization of pollen grain on the stigma and label on it the following Pollen tube Ovary. 17. Trace the F1 generation formed by crossing two plants with separate traits for shape and seed colour- round green (RRyy) and wrinkled yellow(rryy). Mention the characteristic exhibited by it. (RRyy) (rryy) F1 18. How is the sex of a new born determined genetically in humans? 19. Name two factors that could lead to the rise of new species. Why are the wings of birds and bats considered analogous organs? 20. How is the refractive index of a medium related to the speed of light? Light enters from air to diamond having refractive index 2.40. Calculate the speed of light in the diamond. The speed of light in air is 3 10 8 ms 1. Page 5 of 14
2.40 3 10 8 ms 1 21. List two reasons of using convex mirrors as rear view mirror in vehicles. An object is placed at a distance of 10 cm in front of a convex mirror of focal length 15 cm. Find Position and nature of the image formed. 15 cm 10 cm 22. A beam of white light falling on a glass prism gets split up into seven colours marked 1 to 7 as shown in the diagram The colour at position marked 3 and 5 are similar to the colour of the sky and the colour of gold metal respectively. Is the above statement made by the student correct or incorrect? Justify. Which of the above shown positions corresponds approximately to the colour of a brinjal (iii) Neel which is applied to clothes danger signal (iv) Orange 1 7 3 5 Page 6 of 14
(iii) (iv) 23. What is observed, when a small piece of sodium, about the size of a couple of grains of rice, is dropped into a test tube containing ethanol? How is the gas evolved tested? Detergents are more effective than soaps in hard water. Justify this statement. OR/ State in brief two main reasons behind the existence of a large number of carbon compounds in nature. What is a homologous series of carbon compounds? Mention its any two properties. (iii) Write the name of following compounds : (iii) 24. Write the function of ovary uterus in the human female reproductory system. How does embryo get nourishment inside mothers body? (c) What happens when the egg is not fertilized? (c) OR/ Draw a neat diagram of human female reproductive system and label on it the following four parts. Ovary Fallopian tube (iii) Uterus (iv) Cervix What are sexually transmitted diseases? Name a sexually transmitted disease caused due to bacterial infection viral infection. Page 7 of 14
(iii) (iv) 25. Draw ray diagrams in the following cases to show the position and nature of the image formed by a concave mirror when an object is placed. between pole and focus between focus and centre of curvature (iii) at the centre of curvature How will the nature and position of image formed change in case and if the concave mirror is replaced by a convex mirror? (iii), OR/ Name the type of lens used to obtain. a magnified and virtual image of an object. a diminished and virtual image of an object. Draw labelled ray diagrams to show the formation of the required image in each of the above two cases. Which of these lenses could also form a magnified and real image of the object? State the position of the object for which this could happen. SECTION - B / 26. Time taken for the colour of ferrous sulphate solution to turn colourless when Aluminium metal is added to it is approximately. Few seconds 2 hours (c) 24 hours (d) 30 minutes Page 8 of 14
2 (c) 24 (d) 30 27. A student added Aluminium, copper, Zinc and iron metals to copper sulphate solution in 4 different test tubes. In one of the test tubes he observed that no colour change of copper sulphate solution took place. Mark that test tube? Test tube 1 Aluminium + copper sulphate Test tube 2 Zinc + copper sulphate (iii) Test tube 3 Copper + copper sulphate (iv) Test tube 4 Iron + copper sulphate i ii (c) iii (d) iv 1 + 2 + (iii) 3 + (iv) 4 + a b (c) c (d) d 28. A brisk effervescence was observed by a student when he added acetic acid in the test tubes- I, II II, III (c) III, IV (d) IV, I Page 9 of 14
I, II II, III (c) III, IV (d) IV, I 29. For recording the odour of acetic acid (A) It should be taken in a test tube and heated (B) It should be rubbed in fingers and then smelled (C) The test tube containing Ethanoic acid should be taken as close as possible to the nostrils and then smelled. (D) The vapour of Ethanoic acid should be waved with one hand slowly towards the nostrils and then smelled. A B (c) C (d) D (A) (B) (C) (D) A B (c) C (d) D 30. Odour of acetic acid is like : scent vinegar (c) apple (d) orange (c) (d) 31. The focal length of the concave mirror in the experimental set up shown below is : 10.3 cm 11.0 cm (c) 11.4 cm (d) 12.2 cm Page 10 of 14
10.3 cm 11.0 cm (c) 11.4 cm (d) 12.2 cm 32. A student obtained a blurred image of a distant object on a screen using a concave mirror. In order to obtain a distinct image on the screen he should shift the mirror : towards the screen away from the screen (c) to a position very far away from the screen (d) either towards or away from the screen depending upon the position of the object. (c) (d) 33. To determine the focal length of a convex lens, four students A, B, C and D obtained the image of a distant building on a screen. They measured the distances as given below between : (A) screen and the building (B) lens and the building (C) lens and the screen (D) building and its image The correct value of focal length will be determined by : A B (c) C (d) D A, B, C D (A) (C) (B) (D) A B (c) C (d) D 34. While performing the experiment on tracing the path of a ray of light passing through a glass slab as shown in the given diagram, four students interpreted the results as given below. Which one of the four interpretations is correct? Page 11 of 14
r > e r e (c) i r (d) i > r r > e r e (c) i r (d) i > r 35. On the basis of their experiment to trace the path of a ray of light passing though glass slab, four students arrived at the following conclusions. Select the correct conclusion. Angle of incidence is greater than the angle of emergence Angle of emergence is less than the angle of refraction (c) Emergent ray is parallel to the incident ray. (d) Emergent ray is parallel to the refracted ray. (c) (d) 36. A student is given a permanent slide showing binary fission in Amoeba. The following are the steps in focusing the object under microscope. Place the slide on the stage; look through the eye-piece and adjust the mirror and diaphragm to get even illumination Look through the eyepiece and raise the objective using coarse adjustment until the object is focused. (iii) Make the focus sharp with the help of fine adjustment. (iv) Look through the eyepiece and move the slide until the object is visible. The appropriate sequence of steps is :,, (iii), (iv), (iii),, (iv) (c) (iv),,, (iii) (d), (iv),, (iii) Page 12 of 14
(iii) (iv),, (iii), (iv), (iii),, (iv) (c) (iv),,, (iii) (d), (iv),, (iii) 37. Binary fission begins in Amoeba with Constriction of the body Elongation of the body (c) Constriction of the nucleus (d) Elongation of the nucleus. (c) (d) 38. A chain of yeast cells is formed when : yeast cells do not separate after budding. yeast cells are infected by a virus. (c) yeast cells stick to each other due to mucus (d) yeast cells are infected by a bacteria. (c) (d) 39. Given below are diagrams drawn by four students for budding of yeast. The students who has drawn correct diagram- A B (c) C (d) D A B (c) C (d) D 40. One of the important precautions for the experiment of determining the percentage of water Page 13 of 14
absorbed by raisins is : wipe the soaked raisins gently using a dry measuring the final mass. This precaution is essential as it ensures that : hands do not get wet. the scale pan does not get wet. (c) only the water absorbed by the raisins is weighed. (d) the raisins lose water before weighing. filter paper before (c) (d) 41. 3.5g of raising were placed in 30 ml of distilled water for about 3 hours. The mass of the soaked raisins was found to be 4.2g. The percentage of water absorbed by raisins is 16.6% 20 % (c) 33.3% (d) 40% 3.5g 30 ml 3 4.2g 16.6% 20 % (c) 33.3% (d) 40% - o O o - Page 14 of 14