I, SUMMATIVE ASSESSMENT I, / SCIENCE. X / Class X. Time Allowed : 3 hours Maximum Marks : 90

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1 I, 06-7 SUMMATIVE ASSESSMENT I, 06-7 / SCIENCE X / Class X 90 Time Allowed : hours Maximum Marks : 90 AILAHZ General Instructions :. The question paper comprises of two Sections, A and B. You are to attempt both the sections.. All questions are compulsory. All questions of Section-A and all questions of Section-B are to be attempted separately. 4. 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 6 in Sections-A are two marks questions. These are to be answered in about 0 words each. 6. Question numbers 7 to 8 in Section-A are three marks questions. These are to be answered in about 0 words each 7. Question numbers 9 to 4 in Section-A are five marks questions. These are to be answered in about 70 words each. 8. Question numbers to 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. 9. Question numbers 4 to 6 in Section-B are questions based on practical skills. Each question is of two marks. Page of

2 SECTION-A 4 Name any two organisms which breakdown the food material outside their bodies and then absorb it. Why does a compass needle show deflection when brought near a current carrying conductor? Write the special technique used for mounting solar cell panels and mention its advantage. 6 What is meant by water of crystallisation? How would you show that copper sulphate crystals contain water of crystallisation? Name one metal each which is extracted by : reduction with carbon electrolytic reduction reduction with aluminium reduction with heat alone Write two differences between the response of the plants and response of the animals to stimuli. 7 8 State the role of hydrochloric acid present in our stomach in digestion. Define acidity. How can its effect be neutralized? State one example each characterized by the following along with the chemical equation : Change in state. Evolution of gas. Change in temperature. Page of

3 9 Why some metal surfaces acquire a dull appearance when they are exposed to moist air? Write colour acquired by the surfaces of copper and silver in such situation and also write the chemical names of the substances due to which it happens. 0 What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and also mention the type of reaction. What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails in copper sulphate solution for about half an hour. (iv) Draw the structure of neuron and label the following parts on it : Nucleus Dendrite Cell body (iv) Axon Describe the structure and function of nephron with the help of a diagram. Write three points of difference between artery and vein J 400 Joules of heat is produced per second in a 6 resistor. Find the potential difference across the resistor With the help of a diagram of experimental set up describe an activity to show that the force acting on a current carrying conductor placed in a magnetic field increases with increase in field strength. 6 A current carrying conductor is placed perpendicular in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor. State two ways to increase the force an a current carrying conductor in a magnetic field. Page of

4 7 8 A school organized an excursion tour for its students to study and observe that how do people in different villages use various sources of energy for their daily needs. They found in one of the villages that people use wood and cowdung cakes as a fuel whereas in other village they saw a bio gas plant outside the village. Answer the following questions : If you compare the energy sources used by the people of both the villages, which practice would you prefer to be the best and why? State the associated values which you would get from this excursion trip. List any three limitations of using a solar cooker. 9 H O HO Explain the whole information conveyed by the following chemical equation : H O HO In what ratio by mass are the gases hydrogen and oxygen collected when water is subjected to electrolysis? 0 A B base : A : [H ] < [OH ] B : [H ] > [OH ] In a tabular form write the colours of the following indicators in presence of acid and Litmus solution, phenolphthalein solution, methyl orange solution. Classify the following given solutions A and B in acidic and basic, giving reason. Solution A : [H ] < [OH ] Solution B : [H ] > [OH ] Page 4 of

5 (iv) Define hormone. Write four characteristics of hormones in humans. Name the disorder caused by the following situations : Under secretion of growth hormone Over secretion of growth hormone Under secretion of insulin (iv) Deficiency of iodine A B A B Two wires A and B are of equal length and have equal resistances. If the resistivity of A is more than that of B, which wire is thicker and why? For the electric circuit given below calculate : current in each resistor, total current drawn from the battery, and equivalent resistance of the circuit. What is the usual colour code followed for connecting live, neutral and earth wires? Why is it important? What is the function of an earth wire in domestic circuits? State the role of fuse in domestic circuits and explain why fuse should be joined with the live wire and not with the neutral wire in domestic circuits. Page of

6 4 (iv) (v) Give reason for the following : The tungsten is used for filament of electric lamps. The conductors of electrical heating devices such as bread toasters and electric irons, are made of alloys rather than pure metals. An electrical circuit user for determining the value of a resistor should not be left ON for a long time. (iv) The resistance of a wire varies with its area of cross section. (v) Aluminium and copper wires are used for electricity transmission. / SECTION - B A, B, C ml A ml B 0 ml A, B C A B C B A C C A B ph A student took ml of lemon juice in each of test tubes A, B and C. She added ml of water in A and 0 ml of water in B. She tested for ph value in all the three tubes. She would find that ph value of liquid : in A, B and C is same in A is more than that in B and C in B is more than that in A and C in C is more than that in A and B 6 ph ph ph A student was asked to collect apparatus from laboratory store, for doing experiment of ph of given sample. Identify the article which he is not supposed to pick. ph paper dropper litmus paper petridish 7 HCl NaOH HCl Page 6 of

7 8 9 0 NaOH HCl NaOH HCl NaOH While describing the experiment of. Study of properties of HCl and NaOH by their reaction with zinc metal, the teacher told her students that zinc metal shows amphoteric nature. It means that : Zn reacts with HCl only Zn reacts with NaOH only Zn reacts with HCl and NaOH both Zn does not react either with HCl and NaOH FeSO 4, CuSO 4 ZnSO 4, CuSO 4 Al (SO 4 ), FeSO 4 ZnSO 4, Al (SO 4 ) Out of the following pair of compounds, the set in which both the compounds form coloured solutions would be : FeSO 4, CuSO 4 ZnSO 4, CuSO 4 Al (SO 4 ), FeSO 4 ZnSO 4, Al (SO 4 ) An aluminium foil is placed in Zinc sulphate solution. After sometime we observe that the solution : becomes colourless remains colourless becomes blue becomes green A B C Out of the following circuit combinations the one which is in series is : Page 7 of

8 A B C all of these A student while performing the experiment to measure the equivalent resistance of a combination of resistance as per circuit given below, notes that the potential difference across the ends of both resistance joined in parallel is equal to : voltage of battery used ratio of resistance ratio of current flow in each product of resistance Page 8 of

9 8 A part of de-starched leaf of a potted plant was covered with black paper strips on both sides and the plant was kept in sunlight for 8 hours. The leaf was then tested with iodine after boiling it in alcohol. Only the uncovered part of the leaf turned blue black. The inference is that: CO is necessary for photosynthesis Light is necessary for photosynthesis Chlorophyll is necessary for photosynthesis Water is necessary for photosynthesis CO KOH 4 O CO In the experiment to show that 'CO is released during respiration,' the small test tube of KOH solution is suspended inside the conical flask to absorb the : air of the flask moisture of the flask O of the flask CO of the flask released by the seeds While studying a type of reactions, Neena mixed the substances as shown below : Page 9 of

10 Has Neena observed the occurrence of reaction? If not why? What kind of reaction she wanted to study? 6 While performing ohm's law experiment Hanu found that the value of the resistance is varying. What could be the possible reasons of error? (Write any four reasons) (iv) In the diagram given below Ankita labelled the diagram as - Stomatal pore Guard cell Nucleus (iv) Chloroplast. Is she correct? If not, then do the correct lebelling? Page 0 of

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