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 6

2 I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-055 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 6

3 . 2.. SECTION-A What does the thumb indicated in Fleming s right hand rule? Name the phytohormone that helps plants to detect stimulus of light. Give one example each for renewable and non renewable source of energy Define a redox reaction. When magnesium is burnt in air it combines with oxygen to form magnesium oxide. Write chemical equation for the reaction and identify the substance oxidised Fe (s) + CuSO 4(aq) Fe SO 4(aq) + Cu (s) Zn (s) + Fe SO 4(aq) ZnSO 4(aq) + Fe (s) Arrange Iron., Copper and Zinc in increasing order of reactivity on the basis of the following reactions. Give reasons for your choice. Fe (s) + CuSO 4(aq) Fe SO 4(aq) + Cu (s) Zn (s) + Fe SO 4(aq) ZnSO 4(aq) + Fe (s) V 750 m A 7. A torch bulb is rated 2.5 V and 750 m A. Calculate its power Draw a diagram to show magnetic field lines through and around a solenoid carrying current Write balanced chemical equations for the following chemical reactions Hydrogen + Chlorine Hydrogen Chloride Lead + Copper Chloride Lead Chloride + Copper Zinc Oxide + Carbon Zinc + Carbon Monoxide Page of 6

4 9. What is meant by a skeletal chemical equation? What does it represent? Using the equation for electrolytic decomposition of water differentiate between a skeletal chemical equation and a balanced chemical equation. 0. P P ph 5.5 Compound P forms the enamel of teeth. It is the hardest substance of the body. It doesn t dissolve in water but gets corroded when the ph is lowered below 5.5 Identify the compound P How does it undergo damage due to eating chocolate and sweets? What should we do to prevent tooth decay?. Tabulate the change in colour and name of the compound formed when silver articles, copper utensils and iron materials are exposed to air V 0.2 A State Ohm s law. Calculate the resistance of a conductor if the current flowing through it is 0.2 A when the applied potential difference is 0.8 V.. R = R +R 2+R, R, R 2 R Derive the relation R = R +R 2+R when three resistors R, R 2 and R are connected in series in an electric circuit. 4. Define magnetic field. A compass needle get deflected when brought near a bar magnet. Why? List three properties of magnetic field lines. 5. Page 4 of 6

5 During respiration, pyruvic acid is produced as end product of glycolysis. State the end products formed from it on further breakdown in each of the following cases :- yeast in absence of oxygen. lack of oxygen in muscles Presence of oxygen in mitochondria 6. Identify the gland and hormone performing the following functions and complete the table. Function Gland Hormone Regulate carbohydrate, protein and fat metabolism Cause dwarfism Regulate sugar level in blood What is the gap between two neurons called? How does information travel across the gap? Explain. Name the part of neuron system which connects central nervous Systems (CNS) to body parts. 9. List four characteristics of a good source of energy and two disadvantages of burning fossil fuels. 20. Draw a schematic diagram of a biogas plant. Name two elements in the slurry left behind which makes it a good manure. 5 With the help of chemical equations for the reactions describe in brief the method of obtaining copper from its sulphide ore. Draw a labelled diagram to show how copper thus obtained is refined electrolytically. OR Page 5 of 6

6 Hg Cu 2. Define metallurgy. Give the method of extraction of metals (eg Hg and Cu) present low in the activity series from their oxide and sulphide ores. Write the balanced chemical equation for the reactions involved in each step. 5 You have been provided with three test tubes. One of them contains distilled water and the other two contains an acidic solution and a base solution respectively. If you have only red litmus paper how will you identify the contents of each test tube? List two differences between an acid and a base on the basis of their chemical properties. OR ph 7 (i) (ii) ph ph ph ph CO A solution has a ph of 7 (seven). Explain how you would (i) increase its ph (ii) decreases its ph If a solution changes the colour of the litmus from red to blue, what can you say about its ph? What can you say about the ph of a solution that liberate CO 2 from sodium carbonate? Write the balanced chemical equation for the reaction C 5 What is an electric circuit? Calculate the number of electron that flow per second to constitute a current of one ampere. Charge on an electrons is C Draw an electric circuit for studying Ohm s law. Label the circuit component used to measure electric current and potential difference. OR Page 6 of 6

7 2A V 2. Define potential difference between two points in a conductor Name the instrument used to measure the potential difference in a circuit. How is it connected? A current of 2A passes through a circuit for minute. If potential difference between the terminals of the circuit is V, what is the work done in transferring the charges? 5 (i) (ii) What happens to the force experienced by a current carrying conductor placed in a uniform magnetic field, when placed (i) parallel to magnetic field? (ii) perpendicular to magnetic field? State Flemings left hand rule. Use it to find the direction of magnetic field in the following case. OR Draw a schematic diagram of a common domestic circuit showing live wire, neutral wire and the earth wire. List four characteristic features of circuits used in residential buildings. Page 7 of 6

8 24. 5 Draw a cross sectional view of human heart and label aorta and left ventrical. Specify which side of the heart will contain deoxygenated blood and which side will have oxygenated blood. Which chambers are receiving chambers and which chambers send blood from the heart? OR Draw a diagram of human excretory system and label renal artery and urethra. State the functions of renal artery kidney ureter urinary bladder. / SECTION B 25. Page 8 of 6

9 Students were asked to study the reaction between barium chloride and sodium sulphate. Four different reports of the experiment are given below. Choose the correct one. Procedure Observation Mixed powder of barium chloride and sodium sulphate Mixed solution of barium chloride to the solution sodium sulphate Added solution of barium chloride to sodium sulphate powder. Added powder of barium chloride to sodium sulphate solution The colour of the mixture changes to yellow thick white precipitate is formed. Solution become turbid No change observed. 26. CuSO 4 A big iron nail is kept in CuSO 4 solution for two hours, the colour of the solution will change to Pink Red Pale green Yellow 27. ph When we observe ph chart, the two colours seen at its extreme ends are :- red and blue red and green green and blue orange and green. 28. ph A student observed that the colour of ph paper changed to green when she dipped it in distilled water. She added a few drops of concentrated hydrochloric acid to water. The colour of the ph paper would turn to light red apple green dark blue lemon yellow ph Page 9 of 6

10 29. A zinc plate was dipped in a beaker containing dilute hydrochloric acid. After some time it was found that the : surface of zinc becomes brighter surface of zinc becomes black and dull. zinc plate turns into powder. reaction mixture turns green ml of freshly prepared iron sulphate was taken in each of four test tubes. Strips of copper, iron, zinc and aluminium were introduced, each metal in a different test tube. A black residue was obtained in two of them. The right pair of metal forming the precipitate is : copper and zinc aluminium and copper iron and aluminium zinc and aluminium Al 2 (SO 4), Fe SO 4 FeSO 4, CuSO 4 ZnSO 4, Fe SO 4 ZnSO 4, CuSO 4 Out of the following pairs of compounds, identify the one where both the compounds form coloured aqueous solution :- Al 2 (SO 4), Fe SO 4 FeSO 4, CuSO 4 ZnSO 4, Fe SO 4 ZnSO 4, CuSO 4 F E Page 0 of 6

11 The following circuit shows the experimental arrangement for studying the variation of current with potential difference : In this arrangement F is a device used to measures the magnitude of : potential difference across the resistor E resistance of the resistor current flowing through the resistor potential difference across the rheostat D. The rheostat is used in the circuit to : increase the magnitude of current decrease the magnitude of current increase or decrease the magnitude of current change the current in the resistor without changing the potential difference across its two ends 4. (A) (B) 42 ma.2 V 42 ma 4 V 4 ma.2 V 4 ma 4 V Page of 6

12 The rest positions of the needles in a milliammeter and voltmeter not in use are shown in Fig (A). when a student uses these in his experiment, the readings of the needle are in the position shown in Fig B, the corrected values of current and voltage in the experiment are - 42 ma and.2 V 42 ma and 4 V 4 ma and.2 V 4 ma and 4 V 5. R R 2 P Q K T T P P Q A student sets up her circuit, for finding the equivalent resistance of a series combination of two given resistors R and R 2 in the manner as shown in figure. She did not obtain the correct result in her experiment because of a mistake in her circuit. The mistake can be corrected by shifting the : voltmeter and connecting it across P and Q ammeter and connecting it between K and T voltmeter and connecting it across T and P with correct polarity ammeter and connecting it access P and Q. Page 2 of 6

13 6. R R 2 R R 2 V = V 2 = V I = I 2 = I V V 2 V I = I 2 = I V = V 2 = V I I 2 I V V 2 V I I 2 I For three circuits shown in the figure the same two resistors R and R 2 have been connected in parallel in all the circuits but the voltmeter and ammeter have been connected in three different positions. If R R 2 the relation between the three voltmeter and ammeter readings would be :- V = V 2 = V And I = I 2 = I V V 2 V And I = I 2 = I V = V 2 = V And I I 2 I V V 2 V And I I 2 I Page of 6

14 7. A teacher was explaining the procedure to the students for proving light is essential for photosynthesis. One of the step was stated to be destarching the plant. The word destarching means :- Removing chlorophyll from the plants cells. Removing starch from the plant cells. Re-synthesizing starch in plant cells. Allowing plant to stay in sunlight 8. In the experiment to prove light is essential for photosynthesis, one of the item is not used in the procedure. Identify it. Alcohol Black paper Starch solution Water bath 9. Students were observing the temporary mount of a stained epidermal peel under a microscope. They were later asked to draw the guard cells surrounding stoma. The correct diagram must illustrate guard cells having : many nuclei and many chloroplast. one nucleus and one chloroplast. few nuclei and one chloroplast. one nucleus and many chloroplast. Page 4 of 6

15 40. A B The parts shown as A and B in the given diagram respectively are : epidermal cell and stomatal pore guard cell and stomatal pore epidermal cell guard cell guard cell and epidermal cell. 4. KOH CO 2 O 2 CO 2 An experimental set up has been shown below. The purpose of the set up is to show that. KOH solution is essential for respiration CO 2 is released during photosynthesis by plants. germinating seeds need O 2 for respiration. CO 2 is produced by germinating seeds during respiration. Page 5 of 6

16 42. I, II III I II Ca(OH) 2 III I II KOH III I II KOH III I II KOH III An experimental set up was drawn and students were asked to label the parts indicated as I, II & III. The correct label will be :- I Boiled seeds, II Ca(OH) 2 and III - water I Germinating seeds, II KOH solution and III - water I Dry seeds, II KOH solution and III - water I Germinating seeds, II KOH solution and III saline solution. - o 0 o - Page 6 of 6