Important Instructions for the School Principal. (Not to be printed with the question paper) Note:

Transcription

1 Important Instructions for the School Principal (Not to be printed with the question paper) ) This question paper is strictly meant for use in school based SA-I, September-202 only. This question paper is not to be used for any other purpose except mentioned above under any circumstances. 2) The intellectual material contained in the question paper is the exclusive property of Central Board of Secondary Education and no one including the user school is allowed to publish, print or convey (by any means) to any person not authorised by the board in this regard. ) The School Principal is responsible for the safe custody of the question paper or any other material sent by the Central Board of Secondary Education in connection with school based SA-I, September-202, in any form including the print-outs, compact-disc or any other electronic form. 4) Any violation of the terms and conditions mentioned above may result in the action criminal or civil under the applicable laws/byelaws against the offenders/defaulters. Note: Please ensure that these instructions are not printed with the question paper being administered to the examinees. Page of 8

2 I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-066 X / Class X 90 Time allowed : hours Maximum Marks : 90 (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) General Instructions : (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) The question paper comprises of two Sections, A and B. You are to attempt both the sections. All questions are compulsory. 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. All questions of Section-A and all questions of Section-B are to be attempted separately. Question numbers to in Section-A are one mark questions. These are to be answered in one word or in one sentence. Question numbers 4 to 7 in Sections-A are two marks questions. These are to be answered in about 0 words each. Question numbers 8 to 9 in Section-A are three marks questions. These are to be answered in about 50 words each. Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each. Question numbers 25 to 42 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. Page 2 of 8

3 SECTION-A. D.C. A.C. State one advantage of A.C over D.C Where will you find gustatory and olfactory receptors in the human body. List two major hazards of nuclear power generation Write balanced chemical equation for the following chemical reactions, with state symbols of the reactants and the products. When dil.sulphuric acid is poured over magnesium ribbon, hydrogen gas bubbles out and magnesium sulphate enters into the solution. When potassium iodide solution is mixed with silver nitrate solution, insoluble silver iodide separates out from the solution and potassium nitrate remain in the solution. Give reason for the following :- Calcium floats on the surface of water. Iron cannot be used in pure state A 6 resistance wire is doubled by folding. Calculate its new resistance. 2 2 (i) (ii) A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor. He reports that :- (i) the direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending current in the wire are inter changed. Page of 8

4 (ii) for a given battery the degree of deflection of a N-pole decreases when the compass is kept at a point further away from the conductor. Which of the above observation of the student is incorrect and why? 8. 2 g 2 g of ferrous sulphate crystals are heated in a dry boiling tube. List any two observation. Name the type of chemical reaction taking place. 9. List three effects of oxidation in our daily life. Are these effects useful or harmful? Justify. 0. (i) H (ii) (iii). State reason for the following :- (i) Basic solution also have H (aq) ions, but they are not acidic. (ii) Sodium chloride is a neutral salt. (iii) A solution of sulphuric acid conducts electricity while that of alcohol does not. (i) (ii) (iii) Write the chemical equation that takes place when (i) Cinnabar is heated in air. (ii) Zinc carbonate is calcinated. (iii) Zinc sulphide is roasted V 40 W Keeping the potential difference constant the resistance of a circuit is doubled. By what factor does the current change in the circuit? Find the current drawn by an electric bulb of 40 W when it is connected to a source of 220 V. Page 4 of 8

5 . (i) (ii) (iii) For the circuit shown calculate : (i) (ii) (iii) the total effective resistance of the circuit the value of current through each resistor and the total current drawn from the battery Why does a current carrying conductor kept in a magnetic field experience force? List the factors on which the direction of this force depend. Name and state the rule used for the determination of direction of this force. (i) (ii) Explain the process of break down of glucose in human cells: (i) in the presence of oxygen (ii) in the absence of oxygen. Trace the events in correct sequence by which adrenaline prepares the body for running or fighting in scary situations. Name the endocrine bland that secretes this hormone and also state its location. 7. Page 5 of 8

6 How does auxin regulate phototropism in plants? Explain the events for growth of a tendril of a climber around an object. State three environmental consequences of the increasing demand for energy. Give reasons for the following :- A solar cooker box is painted black from inside A solar cooker box is covered with a glass plate A plane mirror reflector is used in a solar cooker. 5 State appropriate reason for the following : Metals are electropositive in nature. Surface of some metals like copper and silver acquire a dull appearance after sometime. Name the substance formed on the surface in each case. Ionic compounds in the solid state do not conduct electricity. However they conduct electricity in molten state or in the form of aqueous solution. OR 2. What is thermit reaction? How is it used to join railway tracks or cracked machine parts? An element reacts with air (oxygen) to form its oxide. When this oxide is dissolved in water, the solution obtained turns red litmus paper blue. Is it a metal or a non metal? Write the corresponding chemical reactions. 5 (i) Page 6 of 8

7 (ii) (iii) ph 7 Baking soda is used in small amount for making bread and cake. It helps to make these soft and spongy. An aqueous solution of baking soda turns red litmus blue. It is also used in soda acid fire extinguisher. Use this information to answer the following questions (i) How does baking soda help to make cakes and bread soft and spongy. (ii) How does it help in extinguishing fire? (iii) Is the ph value of baking soda solution lesser than or greater than 7? OR Tooth enamel is one of the hardest substance in our body. How does it undergo damage due to the eating of chocolates and sweets? What should we do to prevent it? State reason. 22. S.I 5 I State ohm s law. Define resistance and give its S.I unit Find the value of current I in the circuit given below : S.I OR A B l 2l r r/2 Define resistivity. State its S.I unit? Mention the effect of temperature on the resistivity of a material. There are two conductors A and B of the same material of length l and 2l and radii r and r/2 respectively. Find the ratio of their resistance Page 7 of 8

8 What are magnetic field lines? How is the direction of magnetic field at a point determined? Draw the patterns of field lines due to bar magnet. List three properties of magnetic field lines. OR What is electromagnetic induction? State different ways of inducing current in a coil. Suggest the most convenient situation for inducing current in a coil. State the situation in which the induced current in the coil is found to be the highest State three main events occurring during photosynthesis. equation for photosynthesis and the site for photosynthesis. OR Write the overall Draw a neat labelled diagram of internal structure of human heart and depict the flow of blood through it. What would be the consequences of deficiency of haemoglobin in our bodies? / SECTION B 25. (d) An iron nail was suspended in copper sulphate solution and kept for a while. The solution : remained blue and a coating was found on the nail. remained blue and no coating was found on the nail turned pale green and a coating was found on the nail (d) turned pale green and no coating was found on the nail. 26. (d) Page 8 of 8

9 On adding quick lime to water in a beaker a student would observe that the type of reaction is: combination and exothermic combination and endothermic decomposition and exothermic (d) decomposition and endothermic 27. ph (d) A student observed that the colour of ph paper changed to green when she dipped in water. She added a few drops of concentrated hydrochloric acid to the water. The colour of ph paper would turn to : light red apple green dark blue (d) lemon yellow. ph 28. I, II III ph I II III ph ph I, II, III II, III, I III, I, II (d) I, III, II A student was given three test tubes I, II, and III containing ethanoic acid, sodium bicarbonate solution and water respectively. On dipping a ph paper in them, he observed that the colour turned orange in I, blue in II and green in III. If arranged in increasing order of their ph, the sequence of three test tubes should be: I, II, III II, III, I III, I, II (d) I, III, II 29. I II II (d) IV The figures below show set ups for studying the reaction of Zinc with sodium hydroxide. Page 9 of 8

10 I II II (d) IV 0. A B (II) A B (d) Two beakers A and B contain iron (II) sulphate solution. In the beaker A is placed a small piece of copper and in the beaker B is placed a small piece of zinc. It is found that a grey deposit is formed on the Zinc but not on the copper. From these observation it can be concluded : zinc is most reactive metal followed by iron and then copper. zinc is most reactive metal followed by copper and then iron. iron is most reactive metal followed by zinc and then copper. (d) iron is most reactive metal followed by iron and then zinc.. (d) A student put four big iron nails, one each in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed. Only on the surface of one iron nail that was put in the solution of : Zinc sulphate. Aluminium sulphate Copper sulphate (d) Iron sulphate 2. Page 0 of 8

11 A B C (d) D The correct circuit diagram for studying the dependence of the current on the potential difference across a resistor : A B C (d) D Page of 8

12 (d) 24.0 The current flowing through conductor and the potential difference across the two ends are as per reading of the ammeter and the voltmeter shown below. The resistance of the conductor would be (d) (I) (V) X, Y, Z W (d) A student draws the following circuit diagram for the experiment on studying the dependence of current (I) on potential difference (V) across a resistor. The parts labelled X, Y, Z & W in this diagram are respectively :- Page 2 of 8

13 (d) a resistor, a voltmeter, an ammeter and a rheostat a rheostat, a voltmeter, a resistor, a voltmeter an ammeter, a resistor, a voltmeter and a rheostat a rheostat, a resistor, a ammeter and a voltmeter 5. I : I V II : I 2 V 2 I > I 2, V = V 2 I < I 2, V = V 2 I > I 2, V > V 2 (d) I < I 2, V < V 2 Circuit I : Ammeter reads current I and voltmeter reads V Circuit II : Ammeter reads current I 2 and voltmeter reads V 2 The relationship between the readings is :- I > I 2, V = V 2 I < I 2, V = V 2 I > I 2, V > V 2 (d) I < I 2, V < V 2 6. R R 2 Page of 8

14 V I I V I V (d) I V In an experiment, to find the equivalent resistance of a series of combination of two resistors R and R 2, a student uses the circuit as below ; 7. The circuit will give. correct reading for voltage V, but incorrect reading for current I. correct reading for current I, but incorrect reading for voltage V. correct reading for both current I and voltage V (d) in correct reading for,both current I and voltage V 5 Page 4 of 8

15 A B C (d) D A leaf from a destrached plant is covered with black paper strip as shown in the figures below. The starch test is done on the leaf after keeping potted plant in sun light for 5 hours. The result will be as shown in the Diagram. A B C (d) D 8. (iv), (iii), (ii), (i) (i), (ii), (iv), (iii) (ii), (iii), (iv), (i) (d) (i), (iii), (iv), (ii) A student performed the starch test on a leaf. Some steps involved are shown below, which are not in correct sequence: (iv), (iii), (ii), (i) (i), (ii), (iv), (iii) (ii), (iii), (iv), (i) (d) (i), (iii), (iv), (ii) Page 5 of 8

16 9. I, II, III IV I II III IV I II III IV I II III IV (d) II II III IV In the following sketch of the stomatal apparatus, the parts I, II, III and IV were labelled differently by four students. The correct labelling out of the following is :- I guard cell, II stoma, III starch granule, IV nucleus. I guard cell, II nucleus, III stoma, IV chloroplast. I guard cell, II starch, III nucleus, IV stoma. (d) I cytoplasm, II chloroplast, III stoma, IV nucleus. 40. A B C d A B C (d) D Page 6 of 8

17 While preparing a temporary mount of stomata four students used different stomas given below : Student Stain A Acetocarmine B Methylene blue C Safranin d Iodine The correct stain was used by the student :- A B C (d) D 4. CO 2 (d) In the experiment shown in the figure to water is found to rise in the bent tube. The reason is that: (d) CO 2 in the bent tube dissolves in water. partial vacuum is created in the flask atmospheric pressure outside is reduced water in the bent tube rises due to capillary action. 42. Page 7 of 8

18 A B C (d) D After performing the experiment to show that germinating seeds give out carbon dioxide during respiration, student drew the following diagrams. The correct labelled diagram is A B C (d) D - o O o - Page 8 of 8