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Model Question Paper Part - V

10th Standard EM

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Science

Time : 02:30:00 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. The gravitational force of earth acting on a body of mass 1 kg is ___________

    (a)

    8.9 N

    (b)

    9.8 N

    (c)

    980 N

    (d)

    1 N

  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 temperature is

    (a)

    celsius

    (b)

    fahrenheit

    (c)

    kelvin

    (d)

    none

  4. Penetration power is the greatest in_______ rays

    (a)

    alpha

    (b)

    beta

    (c)

    gamma

    (d)

    helium

  5. Mass of 1 mole of Nitrogen atom is

    (a)

    28 amu

    (b)

    14 amu

    (c)

    28 g

    (d)

    14 g

  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. The number of components in a binary solution is _____________

    (a)

    2

    (b)

    3

    (c)

    4

    (d)

    5

  8. The inner mitochondrial membrane gives rise to finger like projections called ____________

    (a)

    oxysomes

    (b)

    matrix

    (c)

    cristae

    (d)

    stalk

  9. The body of leech has

    (a)

    23 segments

    (b)

    23 segments

    (c)

    38 segments

    (d)

    30 segments

  10. ______ acts as a insulator.

    (a)

    myelin sheath(b)

    (b)

    synaptic junction

    (c)

    nodes of ranvier

    (d)

    glial cells

  11. Biogenetic law states that ___________

    (a)

    Ontogeny and phylogeny go together

    (b)

    Ontogeny recapitulates phylogeny

    (c)

    Phylogeny recapitulates ontogeny

    (d)

    There is no relationship between phylogeny and ontogeny

  12. All files are stored in the _____________

    (a)

    Folder

    (b)

    box

    (c)

    Pai

    (d)

    scanner

  13. Part II

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

    10 x 2 = 20
  14. Differentiate mass and weight.

  15. V-I graphs for the two wires A and Bare shown in the figure. If we connect both the wires one by one to the same battery, which of the two will produce more heat per unit time? Give justification for your answer.

  16. What is a longitudinal wave?

  17. Define : Relative atomic mass.

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


  19. (a) What do you infer from this diagram? Identify it.
    (b) Classify the type.
    (c) Give an example

  20. Give the common name of the Hirudinaria granulosa

  21. Explain Chemical evolution of life.

  22. What are psychotropic drugs ?

  23. What is Sprite?

  24. Part III

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

    10 x 4 = 40
  25. Explain the Sign Conventions of 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. Explain the principle & structure of atom bomb.

  28. What is called homologous series? Give any three of its characteristics?

  29. Who discovered Rh factor? Why was it named so?

  30. Mala had a huge scar on her cheek after she met with fire accident during her college days. She is worried ifher baby would inherit the scar she had acquired. She clarified with her doctor, she need not worry about it, as her scar is an acquired trait.
    (i) What are acquired traits?
    (ii) How is it different from inherited traits?

  31. Define Ethnobotany and write its importance.

  32. Distinguish between
    a. somatic gene therapy and germ line gene therapy
    b. undifferentiated cells and differentiated cells.

  33. Write a note an smoking hazards and effects of Tobacco.

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

  35. Part IV

    Answer all the questions.

    6 x 7 = 42
  36. Two blocks of masses 8 kg and 2 kg respectively lie on a smooth horizontal surface in contact with one other. They are pushed by a horizontally applied force of 15 N. Calculate the force exerted on the 2 kg mass.

  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. Vinu dissolves 50 g of sugar in 250 ml of hot water, Sarath dissolves 50 g of same sugar in 250 ml of cold water. Who will get faster dissolution of sugar? and Why?

  39. Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.

  40. Where are estrogens produced? What is the role of estrogens in the human body?

  41. Biofortification may help in removing hidden hunger. How?

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