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

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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 5

2 I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-05 X / Class X 90 Time allowed : hours Maximum Marks : 90 (iii) (iv) (v) (vi) (vii) (viii) (ix) General Instructions : (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 5

Name two tissues which provide control and coordination in animals.

List four observations that help us to determine whether a

List two properties of gold and silver which make them most

Also define these properties. 2 7. Define electric current.

State the frequency of power supply generated in India. 8.

2O 2Al Al 2O 2Fe Name two categories in which you can place this

3 SECTION-A State the use of earth wire in domestic electric ciruit. Name two tissues which provide control and coordination in animals. List two indirect ways of using solar energy. List four observations that help us to determine whether a chemical reaction has taken place List two properties of gold and silver which make them most suitable for making ornaments according to our need. Also define these properties Define electric current. Name the device used to measure electric current in a circuit. How is it connected in the circuit? 2 Name the type of electric current generated by most of the power stations in our country. Why is it preferred over the other type of electric current? State the frequency of power supply generated in India. 8. Fe 2O 2Al Al 2O 2Fe Consider the following chemical Equation : Fe 2O 2Al Al 2O 2Fe Name two categories in which you can place this reaction. Define the term Oxidation of a substance and name the substance oxidised and the oxidising agent in the above reaction. 9. Define a decomposition reaction. Why is this reaction always endothermic? Write a chemical equation to represent a decomposition reaction. Page of 5

4 0. HCl Zn Na 2CO (iii) NaOH Write balanced chemical equations for the reaction of dil HCl with : Zn metal Na 2CO (iii) NaOH. 2. List three properties of sodium in which it differs from the general physical properties of most metals. 5 A J State Joule s law of heating and give it s mathematical form. An electric iron takes a current of 5A and develops J of heat energy in 0s. Calculate the resistance of the electric iron W, 250 V 250 V 50 (iii) ` 6.00 An electric geyser rated 500 W, 250 V is connected to a 250 V line mains. Calculate : the electric current drawn by it energy consumed by it in 50 hours (iii) cost of energy consumed if each unit costs ` A 00 W, 220 V State the function of a fuse in an electric circuit. A circuit has a fuse of 5A. Find the maximum number of 00 W, 220 V lamps that can be used in this circuit List three characteristics of lungs which make it an efficient respiratory surface. Brain and Spinal Cord are two vital organs of our body. How is our body designed to protect them? Page 4 of 5

7. A florist sprinkled a plant hormone to

State two advantages of using solar cells as

5 Metals like iron, silver and copper get

Write the chemical name of the substance

5 7. A florist sprinkled a plant hormone to prevent wilting of leaves. Name the hormone he must have used. Give two more example of plant hormones and also write their function What is biomass? Name the reaction that takes place in a biogas plant. Write main constituent of biogas. List two reasons for considering the biogas an ideal fuel for domestic use. What is a solar cell? State two advantages of using solar cells as a source of energy Metals like iron, silver and copper get corroded on exposure to air. Write the chemical name of the substance deposited on their surface respectively with it s colour, in each case. List four ways by which rusting can be prevented. OR Differentiate between calcination and roasting. Give one example of each. State the step that is followed after calcination or roasting of the ore. Write chemical equation for the reaction involved. 2. ph Tooth decay starts when the ph of the mouth is lower than 5.5. Explain how does the tooth paste prevent tooth decay. Name the acids present in : Nettle sting Curd Page 5 of 5

State the soil conditions under which a farmer treats the soil

A You have three solutions - A, B, and C having a ph of 6, 2 and

Arrange these solutions in increasing order of hydrogen ion

What happens to the hydrogen ion concentration in A as it is

If someone is suffering from a stomach problem called acidity,

Write chemical name and formula of baking soda. 22.

State two factors on which resistance of a conductor depends by

Calculate the resistance of 50m length of wire of cross -

OR (V) (I) V I State the law that gives the relationship between

6 State the soil conditions under which a farmer treats the soil of his field with quick line or slaked line OR A, B C ph 6, 2 9 A You have three solutions - A, B, and C having a ph of 6, 2 and 9 respectively. Arrange these solutions in increasing order of hydrogen ion concentration. Which of the three is most acidic? What happens to the hydrogen ion concentration in A as it is diluted? If someone is suffering from a stomach problem called acidity, why is a solution of baking soda offered as a remedy? Write chemical name and formula of baking soda m 50 m 0.0 mm 2 Define resistance of a conductor. State two factors on which resistance of a conductor depends by stating the dependence also. Calculate the resistance of 50m length of wire of cross - sectional area 0.0 mm 2 and of restivity m. OR (V) (I) V I State the law that gives the relationship between the potential difference (V) across the two ends of a conductor and the current (I) flowing through it. Describe an activity to verify this law. Draw circuit diagram for it s verification. What type of graph is obtained between V and I 2. 5 Draw the pattern of magnetic field lines through and around a current carrying loop. Mark the directions of electric current flowing through the loop Page 6 of 5

7 magnetic field lines. How would the strength of magnetic field due to a current carrying loop he affected if : the radius the loop is reduced to half of original value, and the strength of the current through the loop is doubled? OR A 24. B A Describe an activity to show how a moving magnet may be used to generate an electric current. State the rule to find the direction of electric current generated in the coil. A coil A of insulated copper wire is connected to a galvanometer. What would you observe when a current carrying coil B is brought near A? strength of current in coil B is changed? name the process of generating current in the coil in this manner. 5 Draw a diagram of a longitudinal section of a human heart. Name and label. the chamber from which oxygenated blood leaves the heart vein which carry oxygenated blood. Give reasons for : oxygenated and deoxygenated blood are separate in the heart of mammals ventricles are thick walled. OR Draw a diagram of human alimentary canal. Name and label the site of complete digestion of carbohydrates, proteins and fats. Page 7 of 5

crystals in a dry boiling tube will observe : water

the crystals smell of burning sulphur all of the above

white powder a yellow paste a blue solution 27.

placed on a ph paper, the colour of the paper became dark

acidic Neutral strongly basic weakly basic 28.

8 organ which secretes pepsin. Give reasons why Herbivores have longer small intestine as compared to carnivores. Mucus is secreted along with hydrochloric acid in the stomach / SECTION - B A student while heating some ferous sulphate crystals in a dry boiling tube will observe : water droplets near the mouth of boiling tube colour change of the crystals smell of burning sulphur all of the above Calcium oxide or quicklime is a : transparent liquid a white powder a yellow paste a blue solution 27. ph ph NaOH When a drop of sodium hydroxide solution is placed on a ph paper, the colour of the paper became dark blue. This observation suggests that NaOH solution is : acidic Neutral strongly basic weakly basic 28. HCl ph ph A student placed a drop of HCl on one ph paper and a drop of vinegar on another. The ph of each as determined by him respectively could be : 2 and 5 and 6 and 4 and HCl Page 8 of 5

On adding a pinch of solid sodium carbonate to some dil HCl in a test tube, it is observed that : a pungent smelling gas is produced a pleasant smelling gas is produced brown fumes are formed a gas

When you add some aluminium powder in a solution of copper sulphate then after some time you find that the solution turns pale green turns red appears colourless does not change its colour The

9 On adding a pinch of solid sodium carbonate to some dil HCl in a test tube, it is observed that : a pungent smelling gas is produced a pleasant smelling gas is produced brown fumes are formed a gas with brisk effervescence is produced When you add some aluminium powder in a solution of copper sulphate then after some time you find that the solution turns pale green turns red appears colourless does not change its colour The colours of freshly prepared aqueous solutions of copper sulphate and ferous sulphate respectively are : yellow and pale green green and blue blue and pale green purple and pale green The current flowing through a resistor connected in an electric circuit and the potential difference developed across its ends are shown below. The value of resistance of the resistor in ohm s is : Page 9 of 5

10 . I II I A II OA OA A I OA II IA For the circuits shown in figure I and II, the ammeter reading would be : A in circuit I and OA in circuit II OA in both circuits A in both circuits OA in circuit I and IA in circuit II 4. A, B C A B B C A C B Page 0 of 5

To study the dependence of current on the potential

following graph : A and B B and C A and C only B 5.

resistance of a series combination of two resistors R and

following statement will be true for this circuits?

difference V Correct reading for I but incorrect reading

11 To study the dependence of current on the potential difference, three students A, B and C plotted the following graph : A and B B and C A and C only B 5. R R 2 I V I V I V I V To determine the equivalent resistance of a series combination of two resistors R and R 2 a student arranges the following set up : Which of the following statement will be true for this circuits? Incorrect reading for current I as well as potential difference V Correct reading for I but incorrect reading for V Incorrect reading for I but correct reading for V Correct reading for both I and V Page of 5

12 6. A B C D To determine the equivalent resistance of three resistors, when connected in a parallel arrangement, four students connected the resistors as follows : The correct set up is that of student A B C D 7. To set up the experiment to show that light is necessary for photosynthesis, experimental leaves should be taken for use from : any flowering plant destarched potted plant newly emerged sapling healthy plant growing on the ground Page 2 of 5

8. A B C A B Which part of the destarched leaf will have

many stomata, a student should take the peel from the :

13 8. A B C A B Which part of the destarched leaf will have starch when exposed to sunlight. A only B only C only A and B both 9. To prepare a good temporary mount of leaf peel showing many stomata, a student should take the peel from the : Petiole Midrib Lower surface of the leaf Upper surface of the leaf 40. Identify the correct statement for the given diagram : Epidermal cells have been drawn properly Guard cells are missing Stomata is open Stomata is closed Page of 5

in the flask should be totally dry (C) A

14 4. CO 2 (A) (B) (C) (D) KOH A B B C A C A B C Which of the following precautions are to be taken for a successful run of the experiment to show that CO 2 is given out during respiration. (A) Cork should be air night (B) Seeds in the flask should be totally dry (C) A small tube with freshly prepared KOH solution should be placed in the flask (D) The end of the delivery tube should be above water level The correct answer is : A and B B and C A and C A, B and C 42. KOH KOH Page 4 of 5

15 In the given set up, water will rise in the tube because : Oxygen of air in the flask will be taken up by the KOH pellets. Carbon dioxide given out by the germinating seeds will be absorbed by KOH. Carbon dioxide given out will go through the glass tube and push water up into the tube. Moisture of the germinating seeds will reach the water in the beaker through the delivery tube. - o O o - Page 5 of 5

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

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