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

Size: px

Start display at page:

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

Meagan Hart
5 years ago
Views:

1 -I, SUMMATIVE ASSESSMENT I, / SCIENCE X / Class X 90 Time Allowed : hours Maximum Marks : 90 AYRZYWV General Instructions :. The question paper comprises of two Sections, A and B. You are to attempt both the sections. 2. 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 5. 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 50 words each 7. Question numbers 9 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each. 8. Question numbers 25 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 8

2 SECTION-A Why is iodised salt necessary for our body? 2 How is the resistivity of alloys compared with those of pure metals from which they have been formed? Name the type of micro-organisms that carry out the process of decomposition of biomass in biogas plants. 4 2 (i) (ii) What is observed when carbon dioxide gas is passed through limewater (i) (ii) for a short duration for long duration? Also write the chemical equations for the reactions involved. 5 2 Zn(s) CuSO4(aq) ZnSO4(aq) Cu(s) Page 2 of 8

3 Reverse of the following chemical reaction is not possible : Zn(s) CuSO4(aq) ZnSO4(aq) Cu(s) Justify this statement with reason. 6 2 Why is nitrogen considered an essential element? How do plants acquire nitrogen? 7 (i) Zn H 2 SO 4 ZnSO 4 H 2 (ii) CaO H 2 O Ca(OH) 2 (iii) CaCO CaO CO2 Identify the type of reactions in each of the following reactions : (i) Zn H 2 SO 4 ZnSO 4 H 2 (ii) CaO H 2 O Ca(OH) 2 (iii) Heat 2 CaCO CaO CO 8 CH COOH, H 2 SO 4, H 2 CO, HNO Define olfactory indicators. Name two substances which can be used as olfactory indicators. Choose strong acids from the following : Page of 8

4 CH COOH, H 2 SO 4, H 2 CO, HNO 9 What kind of impurities are generally found in ores? What name is given to such impurities and state the basis of removing the impurities from the ore. 0 CaS CaS ( Ca 20, S 6) Write the electron-dot structure for calcium and sulphur. Show the formation of CaS by the transfer of electrons. Name the ions present in this compound CaS. (Atomic number of Ca 20, S 6) State three common features of respiratory organs of animals. 2 Define reflex arc. Trace the sequence of events in a flow chart which occurs in our body when we sneeze. Page 4 of 8

5 Describe double circulation in human beings. Why is it necessary? V 220 V How much current will an electric iron draw from a 220 V source if the resistance of its element when hot is 55 ohms? Calculate the wattage of the electric iron when it operates on 220 volts. 5 Name, State and explain with the help of a diagram the rule to find the direction of magnetic field around a straight conductor carrying current. 6 (i) (ii) (iii) State the purpose for which the following rules are used : (i) (ii) (iii) Right hand thumb rule Fleming s left hand rule Fleming s right hand rule 7 Page 5 of 8

6 There was a poster making competition in a school on a topic SAVE ENERGY. The students were also asked to give write ups on this topic. A student of the school is unable to make the write up on this topic. Suggest him two steps to SAVE ENERGY? Mention the value which the school is trying to imbibe in his students by holding such a competition. 8 Name two fossil fuels. Write two advantages of fossil fuels. Give one reason to explain the need to conserve fossil fuels. 9 5 Name an ore of mercury and write its chemical formula. Write two steps along with the equations of reactions for obtaining metal from this ore. How carbon or coke acts as reducing agent to obtain metal from an oxide? Give a suitable chemical equation of this reaction to illustrate it ph ph 7.0 Page 6 of 8

7 ph l MHCl lmnaoh (e) [H ] Account for the following : ph. State the relation between hydrogen ion concentration of an aqueous solution and its An aqueous solution has a ph value of 7.0. Is this solution acidic, basic or neutral? Which has a higher ph value, l MHCl or lmnaoh solution? Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it? (e) How do [H ] ions exist in water? 2 5 What are plant hormones? Give four different types of plant hormones and state their functions briefly. 22 (i) (ii) (iii) Explain the following : (i) Alloys are used to make conductors of electrical heating appliances. (ii) Metals of low resistivity are used for electricity transmission (iii) Series arrangement is not used for domestic circuits Page 7 of 8

(i) (ii) (iii) (iv) 50 Hz Study the following current time graphs from two

between the current in the two cases. Name the type of current in the two cases.

(iv) What is meant by the statement that the frequency of current in India is 50

8 (i) (ii) (iii) (iv) 50 Hz Study the following current time graphs from two different sources : (i) (ii) (iii) Use above graphs to list two differences between the current in the two cases. Name the type of current in the two cases. Identify one source each for these currents. (iv) What is meant by the statement that the frequency of current in India is 50 Hz? 24 5 B, B 2 B A 4 A (i) (ii) B Should the resistance of an ammeter be high or low? Give suitable reason for your Page 8 of 8

9 answer. Three identical bulbs B, B 2, B are connected as shown in figure. When all the bulbs glow, a current of 4 A is recorded by ammeter A. (i) Calculate the power dissipated in the circuit when all bulbs glow. (ii) What happens to two bulbs when bulb B get fused? / SECTION - B 25 ph HCl Which of the following solutions having same concentration will have lowest ph? dil. HCl lemon juice water dil. sodium hydrogen carbonate solution 26 A B A A B NaOH KCl HCl NaOH NaOH HCl HCl H 2 CO Page 9 of 8

The solutions A and B are : NaOH and KCl HCl and NaOH NaOH and HCl HCl and H 2 CO 27 NaOH HCl Ashu dipped red litmus paper first in dil

10 A student added red litmus solution to A and observed that it changed into blue. When she added another solution B to A in excess, she observed that the solution turned red. The solutions A and B are : NaOH and KCl HCl and NaOH NaOH and HCl HCl and H 2 CO 27 NaOH HCl Ashu dipped red litmus paper first in dil NaOH solution and then in dil HCl. He observed that the colour of the litmus paper : Changed first to blue and then colourless Changed from red to colourless Changed first to blue and then red Remained red in both the solutions 28 Page 0 of 8

11 (i) (ii) (ii) (ii) (iii) (iii) (iv) Shilpee wanted to test the reactivity of iron, she put iron nails in four different solutions as shown below. She would observe that reaction takes place only in (i) and (ii) only (ii) (ii) and (iii) (iii) and (iv) 29 II, III III, IV IV, I II, I The set ups in which the reaction will occur is : II, III III, IV Page of 8

IV, I II, I 0 R R 2 To find the equivalent resistance of two

circuit is not correct. What is the mistake in the circuit?

correctly but not the voltmeter The two resistors, the

The two resistors have been connected correctly but not the

12 IV, I II, I 0 R R 2 To find the equivalent resistance of two resistors R and R 2 connected in series, Rahul prepared a circuit as shown below. Another student Mohit observed the circuit and said that the circuit is not correct. What is the mistake in the circuit? The two resistors and the ammeter have been connected correctly but not the voltmeter The two resistors, the voltmeter and the ammeter all have been connected correctly The two resistors have been connected correctly but not the voltmeter and the Ammeter The two resistors and the voltmeter have been connected correctly but not the ammeter R R 2 Page 2 of 8

13 II I III IV I II III IV In an experiment to calculate the equivalent resistance of two resistances R and R 2 connected in parallel, the correct circuit diagram from the following is : II I Page of 8

14 III IV I II III IV 2 6 A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was exposed to sunlight for six hours and then tested for starch. It was observed that : Both covered and uncovered parts turned blue black Both covered and uncovered parts turned yellowish brown Only the uncovered part turned blue black Only the covered part turned blue black म ल य गय Page 4 of 8

Ca(OH) 2 Ca(OH) 2 Shashank was asked to carry

observed that lime water in the beaker did not

Ca(OH) 2 solution The reason for the lime

prepared Germinating seeds were used Ca(OH) 2

15 Ca(OH) 2 Ca(OH) 2 Shashank was asked to carry out an experiment to show that carbon dioxide is given out during respiration. He constructed the following set-up and observed that lime water in the beaker did not turn milky. Ca(OH) 2 solution The reason for the lime water not turning milky was : It was freshly prepared Germinating seeds were used Ca(OH) 2 solution was placed in the conical flask The germinating seeds did not release carbon dioxide Page 5 of 8

16 4 2 A, B, C D Observe the following reactions : Page 6 of 8

Based on the observations he obtained a V-I graph which was a straight line passing through the origin.

17 Mention the type of reaction taking place in each of the above four cases A, B, C and D. 5 (V) (I) 2 V-I To study the dependence of current (I) on the potential difference (V), a student recorded his observation in tabular form. Based on the observations he obtained a V-I graph which was a straight line passing through the origin. What does this straight line indicate? 6 2 Johanson observed the temporary mount of a leaf peel under a compound microscope and found one part as an elliptical pore and the other kidney shaped. Name these parts. Page 7 of 8

18 Page 8 of 8 -o0o0o0o-

6 (i)name the hormones that are released in human males and females when they reach puberty.

6 (i)name the hormones that are released in human males and females when they reach puberty. PRACTICE PAPER FOR SUMMATIVE ASSESSMENT I, 0 Class X SCIENCE Time Allowed : hours Maximum Marks : 90 General Instructions :. The question paper comprises of two Sections, A and B. You are to attempt both