Dre Tr aL e cm © Stage II Proficiency Ley, (Solutions at Paper tng SAMPLE QUESTION PAPER 9 Science Instructions 1 This question paper consists of 39 questions in 5 sections. 2. All questions are compulsory, However, an intemal choice is provided in some questions. A student is expected to attempt only one of these questions. Section A consists of 20 objective type questions carrying 1 mark each. Section B consists of 6 Very Short questions carrying 2 marks each. Answers to these questions should be in the range of 30 to 50 words 5 Section C consists of 7 Short Answer type questions carrying 3 marks each. Answer to these questions should be in the range of 50 to 80 words. € Section D consists of 3 Long Answer type questions carrying 5 marks each. Answer to these questions should be in the range of 80 to 120 words. Time : 3 hrs Max. Marks : 89 Section E consists of 3 source-based/case-based units of assessment of 4 marks each with sub-parts. mSection A Select and write the most appropriate option out of the four options given for each of the questions 1-20. 1. Consider the given flowchart. (a) (i) and iii) (b) (ii) and (ii) [ext | (©) Gi) and (iv) (@) (and (iv) | [mort] 2. Metals are refined by using different , | methods. Which of the following metals [i f ra are refined by electrolytic refining? oJ (a) Au (b) Ca | Which of the following two combinations (©) Na WK are correct? 3. - can be used as an acid-base ictal ee cee erated indicator by a visually impaired student 0 A No (a) Litmus, Ag No (b) Vanilla essence (i) Mg Yes (©) Turmeric Zn Yes (d) Petunia leaveseudent performed the following four erin nts, 04 (09) 5 “f at “J “f Fe Which of the following observation is correct? (2) The displacement reaction occurs in all experiments except IIT {®) The solid deposition is observed in I, Il and III experiments. (c) The solid deposition is observed in I and II experiment. (@) The displacement reaction is observed in IV experiment. 5. The reaction between potassium bromide and silver nitrate is an example of (a) combination reaction (b) decomposition reaction (c) double displacement reaction (4) displacement reaction 6. Which of the following represents correct balanced chemical equation? (2) AICI, + NHOH —+ AI(OH); + NH,Cl (b) AIC + 3NH,OH—> AI(OH); + 3NH4CI (6) 2AICl; + 3NH,OH —+ 2Al(OH) + 2NH4CI (4) 3AICl; + 4NH OH —+ AKOH); + NH,CI Alkaline KMn0,+ He CH, —COOH In the above given reaction, alkaline KMno, acts as 4) reducing agent (6) catalyst 7. CH; —CH, —On (b) oxidising agent (d) dehydrating agent § Consider the following figure that Tepresents food web. as] Atel. Fe Tranbis yy ‘Samu tee ie 10. 11. 12. Which of the following option depicts the primary consumer in the food web? (a) Rabbits and Mice — (b) Foxes and Grass (c) Rabbits and Fleas (d) Seeds and Foxes The graph shows, how the amount of carbon dioxide taken by a plant 88 . Be \ Fu am Noon Pm Midnight = Why is the uptake of CO} is more during day time ? (a) due to large number of structure in daytime (b) due to photosynthesis (©) due to transpiration (d) due to more water absorbption The result of a dihybrid cross between two individuals is recorded in table as Phenotypes of Numbers of seeds progeny obtained Round, A 315 Round, B 108 Yellow, C 0 Weinkled, D 2 Choose the correct option for A,B,C and D. A B G D (a) Green Yellow Round Yellow (b) Yellow Green — Wrinkled Green, (©) Yellow (d) Green Yellow Green Wrinkled Green Round Yellow Which part of the human brain controls body temperature? (a) Pituitary (b) Diencephalon (c) Hypothalar (d) None of the above Which of the following is not a functional component of an ecosystem? (a) Ecological pyramids (b) Decomposers (c) Sunlight (d) Energy flow43. Four students set up the circuit for the experiment of Ohm's law as shown, Which of the following option is correct? {il *) ww Ww ‘O- ‘lee 5 @ @ , | aa aie @ 14. Which of the following can make a parallel beam of light when light from a point source is incident on it? (a) Concave mirror as well as convex lens (b) Convex mirror as well as concave lens (c) Two plane mirrors placed at 90° to each other (d) Concave mirror as well as concave lens 15. Food web is the (a) food that a spider collec (b) network of interlinked trophic levels (c) network of interlinked food chains (d) display of food items on a website using its web mSection B 16. The law of dominance states that (a) a dominant trait always suppresses the recessive trait. (b) the recessive trait is always expressed. (c) the dominant trait is always suppressed, (d) the recessive trait dominates over trait, Direction (Q. Nos. 17-20) Consist of two statements. Assertion (A) and Reason (R). Anse, these questions selecting the appropriate option given below. dominar, (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R i explanation of A. (c) Ais true but R is false. (d) Ais false but R is true. 17. Assertion (A) Diamond d electricity. Reason (R) Diamond has high refractive index. 18. Assertion (A) Positive phototropism means movement towards light. Reason (R) When sunlight falls on one side of plant, the auxin diffuses towards the sunny side of shoot. Auxin concentration stimulate cells to grow longer and stem appears bending towards sunlight. 19. Assertion (A) DNA copying is necessan during reproduction. Reason (R) DNA copying leads to the transmission of characters from parents to offspring 20. Assertion (A) The stars twinkle while the planet do not. is not the correc loes not conduc Reason (R) The stars are much bigger in size than the planets. Question No. 21 to 26 are very short answer questions. 21. What is covalent bond? What type of bond exists in Clq and CaCl ? 22. Ina pea plamt, find the contrasting trait if the flower is white in colour and shape of pod is constricted. 23. Goitre is caused by which endocrine gland? Write one primary prevention. Or Explain the functions of a neuron.jor the given data showing the focal fa ghvol three concave mirrors A, Band lent he respective distances of different from these mirrors. 2. abiects Object distances Focal length a (inom) (in em) a 45 20 eB 30 15 c 20 30 In the given positions of objects from the mirrors, which of them will form diminished images of the object? 25. What are magnetic field lines? Justify the following statements. (a) Two magnetic field lines never intersect each other. mSection C Question No. 27 to 33 are short answer questions. 27, Explain the reactions of different metals with hot water, cold water and steam. Give one example with a proper balanced chemical equation, Name of the two metals which do not react with any form of water. Or How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can be same process not be applied for them? Name the process used for the extraction of these metals. The pH of a salt used to make tasty and crispy pakoras is 14 (a) Examine the salt used. (b) Write a chemical equation for its formation (0) List its two uses. and reflex different from each othe! Explain how voluntary actiot actions Shyam wants to have twice in size of a Teal image of an object placed at 25 cm Tom a convex lens. 26. 31. 32. 33. (b) Magnetic field lines are closed curves. Or You have two clectric lamps having rating 40 W, 220 V and 60 W, 220 V. Which of the two has a higher resistance? Give reason for your answer. If these two lamps are connected to a source of 220 V, which will glow brighter? (a) Give reason, why ozone layer in the stratosphere is considered useful. What destructive effect do chlorofluorocarbons bring about in atmosphere ? (b) Explain why, it is better to use paper bags than plastic bags. (a) Specify the distance of image from the lens. (b) Find the focal length of the lens. (c) Find the power of convex lens. ‘Two resistors with resistances 5 Q and 10 respectively, are to be connected to a battery of emf 6 V. How will you connect the resistances to obtain (a) maximum current? (b) Calculate the strength of the total current in the circuit in the two c Rishi went to a palmist to show his palm. The palmist used a special lens for this purpose (a) Where should the palmist place/hold the lens so as to have a real and magnified image of an object? (b) If the focal length of this lens is 10 em and the lens is held at a distance of Sem from the palm, use lens formula to find the position and size of the image. Give the basic features of the mechanism of inheritance.mSection D Question No. 34 to 36 are long answer questions. 34. Neha observed the following cases and (b) Describe the process of fertilisation in .| some questions arises in her mind listed flower. below. Help her to find them out. Why ; < sation doce ee start floating when added Or (a) Explain the events of double circulatior to water? Also, why most of the metals (b) Differentiate between fermentation in do not give hydrogen while reacting yeast and aerobic respiration on the basis with nitric acid. Write equation for the of the end products formed. reaction of iron with steam. Name the 36, The diagram shown below is an electri compound of iron obtained. : oF . . in which 7.2 Q resistor is connected in Or with parallel combination of 8 Q and 12 (a) What is the difference between resistors. A power is supplied to the c combustion and oxidation? Under with 6V battery. what condition an oxidation reaction can be called as combustion? Illustrate your answer with one example in each case. (b) Yashi took a thin zinc plate and kept in a glass container having CuSO, pb solution. On examining it was found that the blue colour of the solution is getting Inthe circuit diagram given above, find the lighter and lighter. After a few days yee fieceah 7 when the zinc plate was taken out of 2 See helene age the solution, 2 number of small () total current flowing in the circuit ené holes were noticed in it. State the (c) potential difference across Rj. reason and write chemical equation a of the reaction. (a) Heating elements of electrical & 35, (a) Marriage between cousins is a taboo devices is made up of an alloy rather th a pure metal. Give two reasons. in most of the countries of the world except in some Asian countries. Why (b) Four resistors of 4 each are joined e= to end to form a square. Calculate the should the marriage between close : : ethe cousins be prevented and which equivalent resistance of the combinate? ; > measures will you take to prevent between two adjacent corner? (c) Define resistance and 1 ohm. such practices?section E soserved that the cooking en are becoming black the flame of her burner he complained this and they repair it. e reason for this type of s problem effect our precaution should be taken to en ‘Sita’ used device “X" ‘n metal for preventing as in shock to learn that | device has failed. wing questions on the passage. ne birth control device used by ta metal is commonly used for g device X? ©) What do you think Sita got pregnant 2 does device ‘X’ prevent pregnane: 39. wo 37 to 39 are case-based/data-based questions with 2 to 3 short sub-parts. cnoice is provided in one of these sub-parts. The above diagram shows that two student P and Q performed an experiment on finding the image formation by a mirror. They performed the experiment for different positions of object and obtained different positions of image AB, CDand X represent object, image and the optical device respectively. (a) Based on the text and data given in above paragraph, identify the type of optical device X. (b) What will be the position of the image? If the object is placed between focus and centre of curvature. (c) If the object is placed at a distance of 10 cm in front of the mirror X, then what will be the distance of image formed? [Take, magnification = - 3] Or What will happen, if the upper half of the coneave mirror ‘X’ is covered?