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

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Franklin Maurice Beasley
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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 6

2 I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-048 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

Convert the following statement into balanced

2 2 2 Name the physical quantity that determines the

3 SECTION-A State the effect of a magnetic field on the path of a moving charged particle. Name the part of the neuron where information is acquired. List two characteristics of a good source of energy. Convert the following statement into balanced chemical equations : Zinc reacts with suphuric acid to form zinc sulphate and hydrogen gas. Magnesium burns in oxygen to form magnesium oxide. Define the term amphoteric oxide. Give its two examples Name the physical quantity that determines the rate at which energy is deliverd by an electric current. State and define the unit of this physical quantity. 7. B A 2 Magnetic field lines around a bar magnet are as shown. Ram makes a statement that magnetic field at point A is stronger than at point B. State whether Ram is correct? Justify your answer. 8. Page of 6

ZnCO Zinc is a metal found in the middle

4 Na 2SO 4 BaCl 2 BaSO 4(s) 2NaCl Aqueous solutions of sodium sulphate and barium chloirdie react as follows : Na 2SO 4 BaCl 2 BaSO 4(s) 2NaCl Identify the type of reaction Define the type of reaction Suggest other name to this reaction. 9. A student adds water to quicklime taken in a beaker. He feels the beaker turning hot. Why does this happen? Write a chemical equation for the reaction. State the type of this reaction ml 5 ml. 0 ml of water and 5 ml of sulphuric acid are to be mixed in a a beaker. State the method that should be followed. Why should this method be followed? What is this process called? ZnCO Zinc is a metal found in the middle of the activity series of metals. In nature, it is found as a carbonate ore, ZnCO. Mention the steps carried out for its extraction from the ore. Support with equations V, 00 W 4 ` 4.00 A bulb is rated at 200 V, 00 W. Calculate its resistance. Five such bulbs burn for 4 hours daily. Calculate the units of electrical energy consumed per day. What would be the cost of using these bulbs per day at the rate of Rs 4.00 per unit?. 20 C Page 4 of 6

Electrical resistivities of some substances, in ohm.

electric heating device and why? 4. kw 5 A (220 V) 5. 6.

An electric motor of kw power rating is operated in a domestic electric circuit

What is likely to happen when electric current is passed through the motor?

5 Electrical resistivities of some substances, in ohm.meter, at 20 C are given as follows : Silver Copper Tungsten Mercury Iron Nichrome Out of the two silver and copper, which is a better conductor of electric current and why? Which substance is preferred to be used for electrical transmission lines? Give reason. Name the material that you would advice to be used in the heater elements of electric heating device and why? 4. kw 5 A (220 V) What is overloading of an electric circuit? An electric motor of kw power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What is likely to happen when electric current is passed through the motor? Justify your answer. List the role of each of the following in our digestive system. Muscles of stomach wall Hydrochloric acid Mucus Draw a diagram of reflex arc and label in it sensory neuron, motor neuron, relay neurons, receptors How does our respond when adrenal gland secretes its hormone? We are looking for alternative or non conventional sources of energy. State three reasons for it. 9. Page 5 of 6

State the function of the following in a solar cooker :

Na, Cl 7 5 Write the electron dot structures for the atoms

(atomic number of Na, Cl 7) What type of bond is formed

Show the formation of sodium chloride with the help of

Why do ionic compounds like sodium chloride in solid state

In which state the conduct of electricity through them is

OR Iron is a strong metal, yet it is never used in its

State the major difference in the compositions of steel

Why is stainless steel considered better than steel?

6 State the function of the following in a solar cooker : mirror glass plate blackened surface 20. Na, Cl 7 5 Write the electron dot structures for the atoms of sodium and chlorine. (atomic number of Na, Cl 7) What type of bond is formed between sodium and chlorine atoms? Show the formation of sodium chloride with the help of electron dot structures. Why do ionic compounds like sodium chloride in solid state not conduct electricity? In which state the conduct of electricity through them is possible and why? OR Iron is a strong metal, yet it is never used in its pure state. Give reason. State the major difference in the compositions of steel and stainless steel? Why is stainless steel considered better than steel? Solder in used for welding electrical wires together. Give reason and write its composition (i) Na 2SO 4 (ii) NH 4Cl (iii) KNO (iv) NaCl ph 7 A salt is produced by the reaction between an acid and a base. Identify the acid and the base from which the following salts have been formed : (i) Na 2SO 4 (ii) NH 4Cl Page 6 of 6

(iii) KNO (iv) NaCl Which of the above salts has a ph less than 7? Why?

Name the ions produced by each in water.

2 V 5 5, 8 2 2 (i) (ii) Draw a schematic diagram of an electric circuit (in the

on 8 resistor, a 2 resistor and a plug key, all connected in series.

resistors and a voltmeter is connected so as to measure the potential

Calculate the reading shown by the : (i) ammeter (ii) voltmeter in the above

7 (iii) KNO (iv) NaCl Which of the above salts has a ph less than 7? Why? OR Acids as well as bases ionize in water. Name the ions produced by each in water. If we have hydrochloric acid and acetic acid of equal concentration, which will be a stronger acid and why? How will the concentration of hydrogen ions affected if an acid is diluted? V 5 5, (i) (ii) Draw a schematic diagram of an electric circuit (in the on position ) consisting of a battery of five cells of 2V each, a 5 resistor, on 8 resistor, a 2 resistor and a plug key, all connected in series. An ammeter is put in the circuit the measure the electric current through the resistors and a voltmeter is connected so as to measure the potential difference across the 2 resistor. Calculate the reading shown by the : (i) ammeter (ii) voltmeter in the above electric circuit OR R R 2 R State Ohm s law. How is it represented graphically? Apply this law to obtain the relation for the combined resistance when three resistors R, R 2 and R are connected in series. List two disadvantages of connecting household appliances in series. Page 7 of 6

2. 5 Describe an activity to show that a current carrying conductor when placed in a magnetic field experiences a

Name two devices that use current carrying conductor and magnetic fields.

/ OR Define electromagnetic induction. State two ways by which current can be induced in a coil.

24. 5 State two advantages of transpiration to the plant body.

Why do plants have a slow transport system? / OR 25. What are stomata? What function do they perform?

8 2. 5 Describe an activity to show that a current carrying conductor when placed in a magnetic field experiences a force. State the rule to find the direction of this force. Name two devices that use current carrying conductor and magnetic fields. State the factors on which the force experienced by a current carrying conductor in a magnetic field depends. / OR Define electromagnetic induction. State two ways by which current can be induced in a coil. State the rule to find the direction of induced current. Describe one of these ways with the help of an activity State two advantages of transpiration to the plant body. List in tabular form two ways in which transpiration is different from translocation. Why do plants have a slow transport system? / OR 25. What are stomata? What function do they perform? With the help of diagram explain opening and closing of stomata. / SECTION - B On mixing aqueous solutions of barium chloride and sodium suplhate we observe that : a colourless gas is evolved. a transparent solution is formed. a white precipitate is formed immediately. a pungent smelling gas evolves with brisk effervescence. Page 8 of 6

26. A student heats a few crystals of ferrous sulphate in a dry boiling tube.

are formed. a cracking sound is heard and a colourless gas is formed.

smell of burning sulphur and change in colour of crystals. 27.

The colour produced on the paper is : yellow blue green red 28.

placed on it. The liquid could be : water diluted HCl NaOH solution lemon juice 29.

another containing a solution of sodium hydroxide.

9 26. A student heats a few crystals of ferrous sulphate in a dry boiling tube. He makes two observations which are : the colour of crystals changes and brown fumes are formed. a cracking sound is heard and a colourless gas is formed. a fruity smell is observed and colour of crystal changes. smell of burning sulphur and change in colour of crystals. 27. ph A drop of sodium carbonate solutions is placed on a ph paper. The colour produced on the paper is : yellow blue green red 28. ph HCl NaOH The colour of ph paper becomes green when a drop of a colourless liquid is placed on it. The liquid could be : water diluted HCl NaOH solution lemon juice 29. HCl A few drops of phenolphthalein are added to a test tube containing dil HCl and another containing a solution of sodium hydroxide. These solutions on adding a drop of phenolphthalein in the two test tubes will appear respectively. pink and colourless colourless in both colourless and pink pink in both 0. Some iron nails were dropped in the solutions of zinc sulphate, copper sulphate Page 9 of 6

of zinc sulphate solution changes colour of

aluminium sulphate solution changes no colour

prepared aqueous solutions of zinc sulphate

normal positions of the pointers of the two

difference across a resistor on the current

10 . and aluminium sulphate. After 5 minutes it is observed that : colour of zinc sulphate solution changes colour of copper sulphate solution changes colour of aluminium sulphate solution changes no colour change occurs in any solution Freshly prepared aqueous solutions of zinc sulphate and aluminium sulphate respectively appear : pale green and blue blue and pale green colourless and pale green colourless in both cases 2. A A 2 V V 2 A V A V 2 A 2 V A 2 V 2 The normal positions of the pointers of the two ammeters A and A 2 and two voltmeters V and V 2 are shown. To study the dependence of potential difference across a resistor on the current passing through it the student should select Ammeter A and Voltmeter V Ammeter A and Voltmeter V 2 Ammeter A 2 and Voltmeter V Ammeter A 2 and Voltmeter V 2. Page 0 of 6

11 To study the dependence of current on potential difference, a student set up the circuit shown below. The student observes : some reading in both ammeter and voltmeter no reading in either ammeter or voltmeter some reading in ammeter but no reading in voltmeter some reading in voltmeter but no reading in ammeter 4. () () (2) (2) () () () The positive and negative terminal markings are missing from a given battery. The correct terminal can be best identified by the arrangement shown in : Page of 6

12 fig. () figures () and (2) figures (2) and () figures () and () 5. P, Q, R, S P Q R S To find the equivalent resistance of two resistors connected in series four students P, Q, R, S connect the voltmeter as shown below : Page 2 of 6

13 The correct setup is that of student P Q R S 6. R R 2 R 2 V R V R, R 2 V In the following circuit diagram the circuits components shown connected in parallel are : R and R 2 only R 2 and V only R and V only R, R 2 and V Page of 6

7. A B C D The figures given below illustrate boiling of

The Figure that illustrates the method correctly is : A B C

keeping its in : light for 2 days light for 2 hours darkness

14 7. A B C D The figures given below illustrate boiling of experimental leaf to remove chlorophyll. 8. The Figure that illustrates the method correctly is : A B C D The leaves of a potted plant can be distressed by keeping its in : light for 2 days light for 2 hours darkness of 2 days darkness for 2 hours 9. A, B, C D X Y A B C D X Y A B C D Page 4 of 6

Four students A, B, C, D make the records given below, for the

cell B Guard cell Stoma C Epidermal cell Stoma D Stoma

the high power of a microscope will find nuclei in : only in

15 Four students A, B, C, D make the records given below, for the parts marked X and Y in this diagram Student X Y A Stoma Guard cell B Guard cell Stoma C Epidermal cell Stoma D Stoma Epidermal cell The correct record, out of these, is that of student A B C D 40. A student while observing a well stained leaf peel mount under the high power of a microscope will find nuclei in : only in epidermal cells only in guard cells guard cells and epidermal cells stoma, guard cells and epidermal cells 4. Page 5 of 6

An experimental set up to demonstrate respiration in

It is obsdrved that water from the beaker has not risen into

has coloured water carbon dioxide is not being absorbed no

CO 2 KOH A student sets up the apparatus for the experiment to

16 An experimental set up to demonstrate respiration in germinating seeds in shown. It is obsdrved that water from the beaker has not risen into the delivery tube because : the set up is air tight the beaker has coloured water carbon dioxide is not being absorbed no oxygen is available to seeds for respiration 42. CO 2 KOH A student sets up the apparatus for the experiment to show that CO2 is released during respiration. After 2 hours, he would observe. KOH turning milky Water level rising in the bent tube in the beaker Water level decreasing in the bent tube in the beaker Water turning turbid in the beaker - o O o - Page 6 of 6

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