CBSE SAMPLE QUESTION PAPER Class Xth  -  Science

 

Time: 2½ Hours                                                                                                                                 Max. Marks: 60

 

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 to 16 in section A and question 27 in section B are long answer type questions and carry five marks 

            each.

 

                                                                              SECTION - A

1.         An object is placed at a distance 80 cm from a converging lens of focal length 22    cm. What is the nature of the

            image ?                                                                                                                                                                 [1]

2.         A lens has power of +3 D. What is the nature and focal length of the lens ?                                                            [1]

3.         What type of reaction occurs inside the sun to produce solar energy ?                                                                      [1]

4.         Why does silicon have valency 4?                                                                                                                          [1]

5.         10 mL of 1 M HCl is mixed with 10 mL of 1 M NaOH then what will be the pH of resulting solution?                      [ 1]

6.         Give two examples of Neutral oxides.                                                                                                                     [1]

7.         A circuit has a fuse of 10 A. What is the total number of bulbs of 50 W (110 V) that can be safely used in

             circuit ?                                                                                                                                                                 [2]

8.         Draw the ray diagram for image formation due to convex lens, when object is                                                         [2]

            (a) Between focus f and 2f

            (b) Between focus and optical centre

9.         Explain the following in terms of electron transfer                                                                                                   [2]

            (a) Oxidation

            (b) Reduction

10.       You have two solutions A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more

             hydrogen ion concentration? Which of one is acidic and which one is basic?                                                            [2]

11.       How can you distinguish between a plane mirror, a concave mirror and a convex mirror without touching it ?           [3]

12.       How is destructive distillation of wood carried out ? Explain and also give the products obtained name of?              [3]

13.       What is Thermite process? Explain aluminothermy process.                                                                                    [3]

14.       Draw the three-dimensional structure of methane and explain catenation property of carbon.                                   [3]

15.       (a)Two lamps A, rated 100 watt 220 V and B, 70 W at 220 V are connected in  parallel to a 220 V supply.

                What current is drawn from the supply line? What will   be the total power consumed by the two bulbs if supply

                 voltage drops to 209 V?

                                                                                    OR

                      A 60 W lamp requires 0.272 A of current at 220 V. While a 40 W lamp requires 0.182 A of current of  220 V.

                If both of them are connected in series with   a 220 V line how much amphere of current will flow through each

                lamp ? Also find power consumed by the series combination of the two bulbs.                                                    [5]

16.       Explain the Mechanism of the cleaning action of soaps and give two differences between soap and synthetic detergent

            and give two advantages of soaps over detergents?                                                                                                  [5]

                                                                                    OR

            What is activity series of metals?

            (a)Arrange the metals Zn, Mg, Al, Cu and Fe in the decreasing order of reactivity.

            (b) What would you observe when you put

                        (i) Some Zn pecies into blue copper sulphate solution

                        (ii) Some Cu pieces into green ferrous sulphate solution

            (c)Name a metal which combines with hydrogen gas. Name the compound formed.

                                               

                                                                                 SECTION - B

17.       Why are viruses not considered as living, when not present in living cells?                                                                [1]

18.       What is the initial amount of filterate produced daily by kidneys of a normal healthy person?                                    [1]

19.       Which character did Archeopteryx have in common with present day birds?                                                           [1]

20.       How can we detect smell of agarbatti?                                                                                                                     [2]

21.       A population of red beetles living in green bushes is being eaten by crows. During sexual reproduction, a green beetle

            is found in progeny. What will be fate of new trait? Will it be able to survive in habitat?                                           [ 2]

22.       Why is there a need for chemical communication?                                                                                                  [2]

23.       Make labelled sketch of a gram seed. Mention the function of parts of embryo.                                                        [2]

24.       Give one example where people’s participation was not allowed in management of forest.                                       [2]

25.       Why is damage to ozone layer a cause for concern? What steps are being taken to limit damage?                             [3]

26.       Who are stakeholders for various forest products?                                                                                                 [3]

27.       Explain the factors which cause speciation.                                                                                                              [5]

                                                            OR

            Given below is graph of total coliform count levels in Ganga (1993-1994).        

           

 

            (a) Mention the region where pollution is maximum and minimum.

            (b) Why was coliform bacteria taken for this study?

            (c) Give 2 reasons why Ganga is more polluted here.

 

Tips: 1. Time management of solving problem is very important. 2. Do write formulae while solving the numerical and ensure     the conversion of physical quantities into same system of units before substituting the values. 3. Do not forget writing units of the physical quantities obtained after solving problem. 4. Do not forget to revise the content of answer sheet. 5. Draw Diagrams properly.   ÙæðÅUÑ- ØãU °·¤ âñ{ÂÜ ÂðÂÚU ãñU ÁM¤ÚUè ÙãUè´ ç·¤ §âè ×ð´ âð ÂÚUèÿææ ×ð´ ÂýàÙ ¥æ°Ð

Rakesh Singh Ranawat Akash Institute Dehradun