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Public Exam Model Question Paper July 2020

10th Standard EM

    Reg.No. :
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Science

Time : 02:45:00 Hrs
Total Marks : 100

    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. When you paddle a canoe, the canoe goes forward. This is an example of _______

    (a)

    Newton's I law

    (b)

    Newton's II law

    (c)

    Newton's III law

    (d)

    Law of conservation

  2. The eye defect ‘presbyopia’ can be corrected by

    (a)

    convex lens

    (b)

    concave lens

    (c)

    convex mirror

    (d)

    Bi focal lenses

  3. The formula for conversion of temperature from Kelvin to Celsius is

    (a)

    C=K+73

    (b)

    C=K-273

    (c)

    C= K+460

    (d)

    C=K-460

  4. India's Nuclear Power Programme has ________ reactors in operation.

    (a)

    10

    (b)

    12

    (c)

    14

    (d)

    19

  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. Electronegativity values of Na and CI are 0.9 and 3.0 respectively predict the nature of bonding.

    (a)

    Ionic

    (b)

    Covalent

    (c)

    Coordinate

    (d)

    Metallic

  7. Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation _____________

    (a)

    12g

    (b)

    11g

    (c)

    16g

    (d)

    20g

  8. ____________ helps in transpiration.

    (a)

    Stomata

    (b)

    Epidermis

    (c)

    Trichomes

    (d)

    Root hairs

  9. The animals which give birth to young ones are

    (a)

    Oviparous

    (b)

    Viviparous

    (c)

    Ovoviviparous

    (d)

    All the above

  10. Each neuron can transmit ______ nerve impulses per second.

    (a)

    2000

    (b)

    3000

    (c)

    1000

    (d)

    5000

  11. Paleontologists deal with

    (a)

    Embryological evidences

    (b)

    Fossil evidences

    (c)

    Vestigial organ evidences

    (d)

    All the above

  12. Which is used to build scripts?

    (a)

    Script area

    (b)

    Block palette

    (c)

    stage

    (d)

    sprite

  13. Part II

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

    10 x 2 = 20
  14. Why a spanner with a long handle is preferred to tighten screws in heavy vehicles?

  15. Give the formula for the following
    (i) Ohm's law
    (ii) Joules law 
    (iii) Effective resistance for resistance in series
    (iv) Power
    (v) Specific resistance

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

  17. Give any two examples for heterodiatomic molecules.

  18. What is aqueous and non-aqueous solution? Give an example.

  19. What are bulliform cells?

  20. Write the dental formula of rabbit.

  21. Give some examples of vestigial organs in man.

  22. What are psychotropic drugs ?

  23. Write a short note on editor and its types?

  24. Part III

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

    10 x 4 = 40
  25. Write the sign convention for lenses.

  26. Calculate the coefficient of cubical expansion of a zinc bar. Whose volume is increased 0.25 m3 from 0.3 m3 due to the change in its temperature of 50 K.

  27. Distinguish between Nuclear fission and nuclear fusion.

  28. How is ethanol manufactured from sugarcane?

  29. The complete events of cardiac cycle last for 0.8 sec. What is the timing for each event?

  30. Write a note on mutation

  31. How can you determine the age of the fossils?

  32. Differentiate between outbreeding and inbreeding.

  33. Ramu studies in a school and his friends are discussing about drugs. They force him to use drugs and threaten to avoid him / harm him if he refuses. What should Ramu do?

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

  35. Part IV

    Answer all the questions.

    6 x 7 = 42
  36. State Newton’s laws of motion?

  37. Metal A belongs to period 3 and group 13. A in red hot condition reacts with steam to form B. A with strong alkali forms C. Find A,B and C with reactions

  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. A breeder wishes to incorporate desirable characters into the crop plants. Prepare a list of characters he will incorporate

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