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118172


 


Sample Paper – 2009
Class – X
Subject – Science


Time: 2:30hrs+15mintues                                                                                                                              mm60


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General Instructions


1. The question paper comprises of two sections A and B. You are to attempt both


     the sections.


2. All questions are compulsory.


3. There is no overall choice However, internal choice has been provided in all the


     three questions of five marks category. Only one option in such questions is to be


     attempted.


4. All questions of section A and all questions of section B are to be attempted


    separately.


5. Questions 1 to 6 in section A and 17 to 19 in section B are short question. These


    carry one mark each.


6. Questions 7 to 10 in section A and 20 to 24 in section B are short answer type


    questions and carry two marks each.


7. Questions 11 to 14 in section A and 25 to 26 in section B are also short answer


     type questions and carry three marks each.


8. Questions 15 and 16 in section A and question 27 in section B are long answer


     type questions and carry five marks each.


 


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Section A


1. 42422


Fill the temperature required for the reaction. Whether formula for P-O-P, 42 is possible .if not write its accurate formula [ANSWER IS] :-373K , (CaSO4)2. H2O [calcium sulphate hemihydrates]              1




2. Is oxidation and reduction reaction go hand in hand. Give an example.                                                        1


3.  Complete the ray diagram. Also label its angle of incident                            1


 


 


4 Define one ampere. Calculate the number of electron constitute one coulomb of charge.              1


5 During Ohm’s law which of reading may be wrong?














V


2


4


6


I


0.4


0.6


1.2


6              Why nitrogen or argon like noble gases are filled in electric bulbs                                                        1


7.              Write the balance chemical equation


              (a) Aluminium + Copper chloride → Aluminium chloride + copper


              (b)Metal carbonate + Sulphuric acid → --------- +-----------


                Name the gas produced, is it combustible                                                                                    [1+1]


8.               The near point of a hypermetropic eye is 1m. What is the power of the lens required to correct               this defect? Assume that the near point of normal eye is 25cm.                                                        2


9              [a] How can 2Ω, 3Ω, and 6Ω are connected to give total resistance of (a) 4Ω (b) 1Ω


              [b]Two heaters each of 500watt operated 8 hours per day. What is cost of energy to operate it for               the month of Nov. @ Rs. 4 per unit?                                                                                                  1+1


10.                A copper wire has diameter 0.2mm and resistivity of 1.6 X 10-8   ohm meter. What will be the               length of this wire to make its resistance 56 ohm? How much does the resistance change if the               diameter is doubled?                                                                                                                              [1 +1]


11              What is an electric motor? Write the principle and roll of half ring               commutattor in DC motor? What               is the frequency of AC in India?                                                                                                  [1 /2+1+1+1/2]             


12.              Write electron dot structures of CaO, benzene, cyclohexane, H2S, S8 and CO2                            3


13              [a]. What is precipitation reaction, give example?


              [b] Define rancidity, how it occur?


              [c]Why chemical equations should be balance?                                                                                    1x3


 


 


14.[a]

















































3


4


5


6


7


8


9


10


Lithium


 


 


Carbon


 


Oxygen


L


Neon


X


 


 


E


 


G


Q


 


Y


 


 


 


 


 


R


 


Z


 


 


 


 


 


T


 


                                          Answer the following questions                                                                                    (a) Give the letters having valency one


(b) Which element have small atomic size between X and Q


(c) Which type of compounds will be formed between E and L? For chapter wise solved sample papers log on


 


 


(d)Write the formula of compound made by elements Y and G


              [b] Write the two merits of Mendeleev’s periodic table                                                                      2+1


15.              [i]               What is aqua regia, Amphoteric oxide, ore, and gangue?                                  


              [ii]              Write flow chart in the extraction of a metal?                                                       


              [iii]              Name one metal which will displace hydrogen from dilute acids, and one metal which will               do not.


              [iv].               Write importance of PH. in daily life.                                                                      [2+1+1+1]


Or


[i]              Write the structural formula, 2, 2-dimethyl propane, Butanone, Bromopentane,.2,3- methyl butane?                                                                                   


[ii]              Explain the mechanism of the cleaning action of soaps




[iii]              Identify the hydrocarbon that turns bromine water colorless


                            CH4, C2H6, C2H2, C3H4, C2H4


 


[iv]              A gas can be collected by the method shown in the fig .Why this gas is collected by this method Name the gas                                                                                                                                                                                                                                                                                                                                  [2+1+1+1]             


16              [i]   What is aperture and the power of lens? Focal length of concave lens is 25cm find its power?


              [ii]Refractive index of Diamond is 2.42.What is meant by this?


              [iii]Draw the image by concave lens   when object is at (a) infinity (b) between f and 2f  


                                                                                                                                                          [2+1+2]


                                                                                    Or


[i]              An object of size 4 cm is placed at a distance of 20cm from the pole of a concave mirror of radius of curvature 30cm. Calculate the distance  and size of the image so formed. What will be               the nature of image? 


[ii]               Why does the sky appear dark instead of blue to an astronaut?


[iii]              Draw label diagram of an eye, write the causes of myopia and show how it can be prevented with ray diagram


[iv]The far point of a myopic person is 100cm in front of the eye. What is the nature and power of the lens required to correct the problem               For chapter wise solved sample papers log on


                                                                                    [1+1+2+1]


Section B


17              Expand CFC, IUCD, OC, CNG                                                                                                                1


18.              Define hormone. What is the function of plant hormone cytokinin                                                         1


19.              Define blood pressure? What is the range of B P of a healthy man?                                          1


20              Draw label diagram of solar cooker. Can a polythene sheet be used instead of thick glass , why?                                                                                                                                                                                      2


21              .What contribution forest officer Sh,. A.K. Banerjee made in protection of environment?              2.


22.              How does Mandel’s experiment show that traits are inherited independently?                            2


23              What is meant by vegetative propagation? Describe its various ways.                                          2


24.              Write the names of source gland and functions of the following hormones


              (i) Adrenaline (ii) Thyroxin                                                                                                                2.


25.              What are the various evidences in favour of evolution?                                                                      3


26              [i] If we chew a wheat grains for a long time it tastes sweet why?


              [ii] Name the finger like projections present on the inner lining of intestine and state their function.


              [iii] What is meant by systole and diastole?                                                                                     1+1+1




27              ..[i] What is meant by pollination? Name its various types of pollination agents?


              (ii)Labeled the diagram given, and explain how exchange of gases occurs in leaf of a plant.


              (iii)Draw cross- section of human heart; label it arrow path of circulation by arrows only.                                                                     


                                                                                                                                                                        [1+2+2]


                                                                      Or


              [i]What are the different methods of contraception?


              [ii] What is regeneration; explain with the help of suitable example?


              [iii]Describe the process of fertilization in a flowering plants?                                          [1 ½ +1 ½ +2]


 


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