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Public Exam Model Question Paper June 2020

10th Standard EM

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Science

Time : 02:45:00 Hrs
Total Marks : 75

    Part I

    Answer all the questions.

    Choose the most suitable answer from the given four alternatives and write the option code with the corresponding answer.

    12 x 1 = 12
  1. The momentum of a heavy object at rest will be

    (a)

    large

    (b)

    infinity

    (c)

    zero

    (d)

    small

  2. A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at

    (a)

    focus

    (b)

    infinity

    (c)

    at 2f

    (d)

    between f and 2f

  3. SI unit of heat is

    (a)

    calorie

    (b)

    joule

    (c)

    kilo calorie

    (d)

    kelvin

  4. In molecular biology, radioisotope are used in ________ surgical instruments.

    (a)

    engraving

    (b)

    sterilizing

    (c)

    sharpening

    (d)

    preserving

  5. Th e volume occupied by 4.4 g of CO2 at S.T.P

    (a)

    22.4 litre

    (b)

    2.24 litre

    (c)

    0.24 litre

    (d)

    0.1 litre

  6. The number of elements present in sixth period of modern periodic table is __________

    (a)

    8

    (b)

    18

    (c)

    16

    (d)

    32

  7. A solution is a __________ mixture.

    (a)

    homogeneous

    (b)

    heterogeneous

    (c)

    homogeneous and heterogeneous

    (d)

    non homogeneous

  8. __________ help in absorption of water and minerals.

    (a)

    Root hairs

    (b)

    Stomata

    (c)

    Epidermis

    (d)

    Trichomes

  9. Pharyngeal ganglion in leech is a part of

    (a)

    Excretory system

    (b)

    Nervous system

    (c)

    Reproductive system

    (d)

    Respiratory system

  10. Sneezing, yawning etc are examples of _______

    (a)

    voluntary actions

    (b)

    involuntary actions

    (c)

    reflex actions

    (d)

    planned actions

  11. The ‘use and disuse theory’ was proposed by __________.

    (a)

    Charles Darwin

    (b)

    Ernst Haeckel

    (c)

    Jean Baptiste Lamarck

    (d)

    Gregor Mendel

  12. Which is used to edit programs?

    (a)

    Inkscape

    (b)

    script editor

    (c)

    stage

    (d)

    sprite

  13. Part II

    Answer any 7 questions. Question no. 22 is compulsory.

    10 x 2 = 20
  14. Classify the types of force based on their application.

  15. Why copper were is used as connecting wires in the circuit?

  16. What is the minimum distance needed for an echo?

  17. What is Molar volume of a gas?

  18. Define Volume percentage

  19. Draw the ultrastructure of a chloroplast and label the parts.

  20. How is diastema formed in rabbit?

  21. 'Our teeth and an elephant's tusks are homologous organs'. Justify this statement. What do the analogous organs indicate?

  22. How does insulin deficiency occur?

  23. What is Sprite?

  24. Part III

    Answer any 7 questions. Question no. 32 is compulsory.

    7 x 4 = 28
  25. Explain the working of the eye.

  26. Find the final temperature of a copper rod. Whose area of cross section changes from 10 m2 to 11 m2 due to heating. The copper rod is initially kept at 90 K. (Coefficient of superficial expansion is 0.0021 /K)

  27. Explain the uses of radio isotopes in medicine field?

  28. Arrive at, systematically, the IUPAC name of the compound: CH3–CH2–CH2–OH.

  29. Why is the circulation in man referred to as double circulation?

  30. How are chromosomes classified based on the position of centromere?

  31. Why is Archaeopteryx considered to be a connecting link?

  32. Name three improved characteristics of wheat that helped India to achieve high productivity.

  33. Write a note on Obesity.

  34. Program for print the word “Hello” with sound

  35. Part IV

    Answer all the questions.

    6 x 7 = 42
  36. State the universal law of gravitation and derive its mathematical expression

  37. a) Identify the bond between H and F in HF molecule.
    b) What property forms the basis of identification?
    c) How does the property vary in periods and in groups?

  38. 'A' is a blue coloured crystaline salt. On heating it loses blue colour and to give 'B'. When water is added, 'B' gives back to 'A'. Identify A and B, write the equation

  39. A solid compound ‘A’ decomposes on heating into ‘B’ and a gas ‘C’. On passing the gas ‘C’ through water, it becomes acidic. Identify A, B and C.

  40. A plant hormone was first discovered in Japan when rice plants were suffering from Bakanae disease caused by Gibberella fujikoroi. Based on this information answer the following questions:
    a. Identify the hormone involved in this process.
    b. Which property of this hormone causes the disease?
    c. Give two functions of this hormone.

  41. With a neat labelled diagram explain the techniques involved in gene cloning.

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