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CBSE - X

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Term 2 - Summative Assessment

Science (Theory)

Question Paper Set - 1

Time: 3 to 3 ½ hours
Max. Marks: 80

Instructions:

  1. The question paper consists 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 each. You have to attempt only one option in each question.
  4. All questions in Section A and all questions in Section B are to be attempted separately.
  5. Question numbers 1 to 4 in Section A carry 1 mark each. These are to be answered in one word or one sentence each
  6. Question numbers 5 to 13 carry 2 marks each. These are to be answered in about 30 words each.
  7. Question numbers 14 to 22 carry 3 marks each. These are to be answered in about 50 words each.
  8. Question numbers 23 to 25 carry 5 marks each. These are to be answered in about 70 words each.
  9. Question numbers 26 to 41 in Section B are multiple-choice questions based on practical skills. Each question carries one mark. You are to choose the correct option from among those given.

Section A

  1. Why doesn’t carbon form ionic bonds? (1)
  2. What colour do you get if you mix red and green?
  3. In a food chain, there is a unidirectional flow of A from producers to consumers. What is A?
  4. A field sprayed regularly with DDT contains a food chain that is composed of snakes, grasshoppers, frogs and mongooses. Which organism will have the maximum amount of DDT accumulated in it through the food chain?
  5. Write the electronic configuration of F (Z=9) and K (Z=19).
  6. Also predict the valency exhibited by them. (2)

  7. a) State Mendeleev’s periodic law.
  8. b) An element, “X,” belongs to group 13 of the periodic table. Write the formula of its oxide. (2)

  9. Name the technique of vegetative propagation from the following clues:
  10. a) A single nucleus in a cell gives rise to many cells in a cyst.

    b) Plant tissue placed in an agar medium gives rise to a new plant.

    c) The stem of one plant is fused with the root of another.

    d) An organism grows into separate individuals from cut pieces.

  11. Describe the type of reproduction seen in hydra and bryophyllum.
  12. You are given kerosene (µ=1.44), turpentine (µ =1.47) and water (µ=1.33). In which of these does light travel the fastest? Arrange them in increasing order of the speed of light through them.
  13. Write very briefly about the cornea, iris, pupil and the retina.
  14. What colour is the sky when seen from space? Why?
  15. What was the “Hug the Trees Movement”?
  16. List any four water harvesting techniques practised in different parts of India.
  17. a) Draw the electron dot structure of the ethene molecule. Write the equation to represent what happens when ethene is treated with H2/Ni. (2)
  18. b) What is the major component of biogas and CNG? (1)

  19. The main groups of the periodic table are shown here. X, Y, Z, A and B are the symbolic representations of the elements present at these positions. On the basis of this table, answer the questions that follow:
  20. Group1

    Group 2

    Group 13

    Group 14

    Group 15

    Group 16

    Group 17

    Group 18

    H

    He

    X

    Z

    A

    Y

    B

    a) Which element is the most metallic?

    b) Which element is the most non-metallic?

    c) Which element has the smallest atom?

    d) Which element is a noble gas?

    e) What is the valency exhibited by element A?

    f) What is the valency exhibited by element X? ()

  21. What is pollination? Describe the types of pollination.
  22. How many chromosomes are present in:
  23. a. A brain cell

    b. A sperm formed in testis

    c. A fertilised egg

  24. The traits expressed in an F2 generation are in the proportion 9 : 3 :: 3 : 1. State whether it is a monohybrid or dihybrid cross, and give one example for that cross.
  25. Define homologous and analogous structures that help in tracing evolutionary relationships. Give two examples of each.
  26. An object is placed at a distance of 25 cm from a spherical mirror, and its image is formed behind the mirror at a distance of 5 cm. Find the focal length of the mirror. Is the mirror concave or convex in nature? Give one use of the mirror so identified.
  27. Find the power of the lens in each of the following cases:
  28. (i) Converging lens of focal length 20 cm

    (ii) Diverging lens of focal length 10 cm

    (iii) A lens that focuses on an object at infinity on a screen placed 25 cm from it

  29. a) When we enter a dimly lit room from bright light, we are not able to see the objects in the room for some time. Give reason. (2)
  30. b) Draw a neat ray diagram showing the formation of a rainbow by water droplets suspended in the air. (1)

  31. a) Write the formula and the IUPAC name of the next homologue of ethanol.
  32. b) Convert: (i) Ethanol into ethene (1)

    (ii) Ethanol into ethyl ethanoate (4)

    Or

    A hydrocarbon, ‘A,’ with the molecular formula C3H6 is treated with H2/Ni as a catalyst.

    a) Identify the functional group in ‘A’. Is compound A saturated or unsaturated? (1)

    b) Write the balanced chemical equation for the reaction. (1)

    c) Write the formula of the next homologue of ‘A’. (1)

    d) Draw the structural isomers of C5H12. (2)

  33. Draw a labelled diagram of a bisexual flower. Explain the role of the following parts:
  34. a. Carpel

    b. Calyx

    c. Corolla

    d. Stamen

    e. Ovule

    Or

    Describe the following processes that take place in human beings:

    a. Fertilisation

    b. Implantation

    c. Menstruation

    d. Vasectomy

    e. Tubectomy

  35. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm.
  36. a) Draw the ray diagram for the given condition. (2)

    b) Find the position, size and nature of the image formed. (3)

    Section - B

  37. The functional group present in aldehyde is:
  38. a) OH b) c) d)

  39. Vinegar is a 5-8 per cent solution of ____ in water.
  40. a) Lactic acid b) Acetic acid c) Tartaric acid d) Formic acid

  41. The burner in the laboratory is burning with a yellow flame. This can be attributed to:
  42. a) Complete combustion of the gas

    b) Incomplete combustion of the gas

    c) Presence of higher saturated hydrocarbons in the gas

    d) Formation of sooty deposit

  43. When a 5 per cent solution of alkaline potassium permanganate is added drop by drop to a hot solution of ethanol in a test tube:
  44. a) The pink colour of potassium permanganate disappears

    b) The pink colour of potassium permanganate persists

    c) The solution turns orange

    d) The solution turns green

  45. Acid X has a lower pH than acid Y. Unlike acid X, acid Y does not undergo complete ionisation. Which of these statements about X and Y is true?
  46. a) Both are mineral acids

    b) Both are carboxylic acids

    c) X is a carboxylic acid, while Y is a mineral acid

    d) Y is a carboxylic acid, while X is a mineral acid

  47. Identify the vegetative propagation from the given image.
  48. a) Stolon

    b) Sucker

    c) Grafting

    d) Epiphyllus buds

  49. What happens when a potato with eyes are placed in pot A, and a potato without eyes is placed in pot B?
  50. a) Pot A and B shows aerial shoots

    b) Pot B shows aerial shoots, but pot A does not

    c) Pot A and B do not show aerial shoots

    d) Pot A shows aerial shoots, but pot B does not

  51. Removing which of these from a flower affects fertilisation?
  52. a) Calyx

    b) Corolla

    c) Stamen

    d) Carpel

  53. The fusion of an egg and a sperm gives rise to a cell named A. Identify A, which further divides repeatedly to form an embryo.
  54. a) Zygote

    b) Foetus

    c) Blastocyst

    d) Morula

  55. A patient is suffering from a disease that damaged her immune system, thereby making her susceptible to infections. Identify the disease.
  56. a) Gonorrhoea

    b) Syphilis

    c) AIDS

    d) Tuberculosis

  57. A boy aged 16 has developed a moustache and a beard, but a boy aged 10 hasn’t. Which of these statements supports your answer?
  58. a) Oestrogen makes the reproductive organs mature and develops secondary sexual characters

    b) Progesteron makes the reproductive organs mature and develops secondary sexual characters

    c) Oestrogen and progesteron makes the reproductive organs mature and develops secondary sexual characters

    d) Testosterone makes the reproductive organs mature and develops secondary sexual characters

  59. A mirror and a thin lens both have f = -25 cm. The mirror and lens are:
  60. a) Both concave

    b) Concave and convex

    c) Convex and concave

    d) Both convex

  61. Which of the following lenses would you prefer to use while reading the small letters in a pocket dictionary?

    a) A convex lens of focal length 50 cm

    b) A concave lens of focal length 50 cm

    c) A convex lens of focal length 5 cm

    d) A concave lens of focal length 5 cm

  62. According to the Cartesian sign convention:

    a) Object distance is always negative

    b) Object distance is always positive

    c) Image distance is always negative

    d) Image distance is always positive

  63. The critical angle of medium 1 with respect to medium 2 is 45°. When a light ray passing through medium 1 to medium 2 incidents at an angle 45°:
  64. a) It passes without deviation

    b) It refracts at an angle of 45°

    c) It reflects at an angle of 45°

    d) It refracts at an angle of 90°

  65. Total internal reflection is possible when light enters:
  66. a) Glass from air

    b) Glass from water

    c) Air from glass

    d) Diamond from glass

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