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Model Question Paper Part - IV

10th Standard EM

    Reg.No. :
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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. Study of moving bodies under the action of forces ______

    (a)

    Statics

    (b)

    Kinematics

    (c)

    Dynamics

    (d)

    Mechanics

  2. Power of a lens is –4D, then its focal length is

    (a)

    4m

    (b)

    –40m

    (c)

    –0.25 m

    (d)

    –2.5 m

  3. All the substances will undergo the following changes like _____ when heated.

    (a)

    increase in temperature

    (b)

    expansion of substance

    (c)

    change of state

    (d)

    all the above

  4. The main source of stellar energy is
    (i) fission reactors
    (ii) fusion reaction
    (iii) chemical reaction
    (iv) thermonuclear reactions

    (a)

    (i) is correct

    (b)

    (i) & (ii) are correct

    (c)

    (i) & (iv) are correct

    (d)

    (ii) & (iv) are correct

  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 chemical symbol of Iron is _________________

    (a)

    I

    (b)

    Ir

    (c)

    FE

    (d)

    Fe

  7. A solution in which no more solute can be dissolved in a definite amount of solvent at a given temperature is called ___________

    (a)

    Saturated solution

    (b)

    Un saturated solution

    (c)

    Super saturated solution

    (d)

    Dilute solution

  8. Mitochondria contain _______________ of protein.

    (a)

    70 - 80%

    (b)

    80 - 90%

    (c)

    60 -70 %

    (d)

    50 - 60 %

  9. In leech locomotion is performed by

    (a)

    Anterior sucker

    (b)

    Posterior sucker

    (c)

    Setae

    (d)

    None of the above

  10. ______ is located between thalamus and hindbrain.

    (a)

    Forebrain

    (b)

    Midbrain

    (c)

    Cerebral lobes

    (d)

    Hypothalamus

  11. Paleontologists deal with

    (a)

    Embryological evidences

    (b)

    Fossil evidences

    (c)

    Vestigial organ evidences

    (d)

    All the above

  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. State the principle of moments.

  15. Write the difference between conductor and insulator.

  16. Name three animals, which can hear ultrasonic vibrations

  17. Write the different types of isotopes of oxygen and its percentage abundance

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

  19. Name the internal factors affecting photosynthesis.

  20. How does leech suck blood from the host?

  21. What is Astrobiology? Explain the criteria.

  22. How does insulin deficiency occur?

  23. What is Scratch?

  24. Part III

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

    10 x 4 = 40
  25. State the laws of refraction.

  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. What are the precautions to be taken by people working in radiation labs?

  28. How is ethanol manufactured from sugarcane?

  29. Describe the structure and working of the human heart.

  30. Write a note on mutation

  31. Define Ethnobotany and write its importance.

  32. Differentiate between outbreeding and inbreeding.

  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. Give the applications of gravitation.

  37. Name the acid that renders aluminium passive. Why?

  38. Will the cool drinks give more fizz at top of the hills or at the foot? Explain.

  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. Sanjay is sitting in the exam hall. Before the start of the exam , he sweats a lot, with increased rate of heart beat. Why does this condition occur?

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

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