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Sample Paper – 2009


Class – X


Subject – SCIENCE (THEORY)
 


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


 


SECTION - A


 



  1. What is the Power of convex lens of the focal length 40 cm?
  2. What will be the sign in the value of magnification produced by a lens when:

    1. A real image is produced.
    2. A virtual image is produced

  3. Why is atomic number a more fundamental property than atomic mass in deciding the properties of an element?
  4. Name the part of the human eye where:

    1. Most of the refraction of light rays entering the eye occurs
    2. Where the real and virtual image is formed.

  5. Write the structural formulae of first two members of homologous series of aldehyde.
  6. Why should water be never added drop wise to concentrated sulphuric acid?

  7. Draw the following diagram in your answer book and show that formation of image of the object AB with the help of suitable rays.

 


                                                                                                      A


 


             


                                                                                   


                                                                        C              B         F                  P


                                       


 


 


 



  1. What is the activity series of metals? Rearrange the following metals in an increasing order of reactivity: Aluminum, Zinc, and Mercury.
  2. What is denatured alcohol?
  3. Two metallic wires A and B of the same material are connected in parallel. Wire A has length L and radius R, wire B has length 2L and radius 2R. Compute the ratio of the total resistance of parallel combination and the resistance of wire A.
  4. Draw the pattern of field lines due to a bar magnet. Mention any two properties of the magnetic field lines.
  5. An organic compound X is an essential constituent of wine and beer. X is responsible for the intoxication caused by these drinks. Oxidation of X yields an organic acid Y which is present in vinegar. Name the compound X and Y. What happens when X reacts with Y. Give a suitable chemical reaction?
  6. Using the part of the periodic table given below, answer the question that follow the table:























Li(3)


Be(4)


 


B(5)


C(6)


N(7)


O(8)


F(9)


Ne(10)


Na(11)


Mg(12)


 


Al(13)


Si(14)


P(15)


S(16)


Cl(17)


Ar(18)


 



  1. Which element is larger atom Li or O?
  2. Which element has higher valency Al or Cl?
  3. Which element is more metallic Na or Mg?
  4. Which element is more non-metallic C or Si?
  5. Select a metal with valency 2 belonging to third period.
  6. Select a non-metal with valency 3 belonging to second period.


  1. (i) What is myopia? How can you correct it? Draw a diagram to show defective and corrected eye.

(ii) Using Len’s formula, find the position of image, its nature and magnification formed by a convex lens of focal length 20 cm, when object is at 18 cm.



  1. Give reason for the following:

    1. Metals are regarded as electropositive elements.
    2. When a piece of copper metal is added to a solution of Zinc sulphate, no change takes place, but the blue colour of copper sulphate fades away when a piece of Zinc is placed in its solution.
    3. Articles made of aluminum do not corrode even though aluminum is an active metal.

  2. In a household, 5 tube lights each of 40 w are used for 5 hours and an electric press of 500W for 4 hours everyday. Calculate the cost of using tube lights and the electric press for 60 days, if the cost of 1 unit of electrical energy is Rs 2.5.

 


Section B


 



  1. Which organ secretes a hormone when the blood sugar rises? Name a digestive enzyme released by this organ.
  2. After a vigorous exercise, you may experience cramps in your leg muscles. Why does this
  3. Name the vitamin necessary for blood clotting.
  4. What is a food chain? How does study of food chain in an area or habitat help us?
  5. What are spinal nerves? How many spinal nerves are present in a human being? Are they sensory, mixed or motor?
  6. (i) What is fertilization? Distinguish between external fertilization and internal fertilization.

(ii) What is the site of fertilization in human beings?



  1. Explain the term analogous and homologous organs with examples.
  2. What do the following transport?

(i) Xylem (ii) phloem (iii) pulmonary vein (IV) Vena Cava



  1. Name the constituents of blood. Why white blood corpuscles are called ‘Soldiers of the body’.
  2. The genotype of green stemmed tomato plants is denoted as GG and that of purple stemmed tomato plants as gg. When these are crossed,

    1. What colour of step would you expect in their F1­ progeny?
    2. Give the percentage of purple-stemmed plants if F­1 plants are self pollinated.
    3. In what ratio would you find the genotypes GG and Gg in the F2 progeny?

  3. Explain that it is a matter of chance whether a couple will give birth to a boy or a girl.

OR


              Which hormone is released into blood when its sugar level rises? Name the organ which produces the hormone and its effect on blood sugar level. Also name one digestive enzyme that this organ secrets and the function of this enzyme.


 


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