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Model Question Paper Part - III

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. A & B are two objects with masses 100 kg & 75 kg respectively, then _______

    (a)

    both will have same inertia

    (b)

    B'will have more inertia

    (c)

    A will have more inertia

    (d)

    both will have less inertia

  2. Which of the following lens would you prefer to use while reading small letters found in a dictionary?

    (a)

    A convex lens of focal length 5 cm

    (b)

    A concave lens of focal length 5 cm

    (c)

    A convex lens of focal length 10 cm

    (d)

    A concave lens of focal length 10 cm

  3. Linear expansion is the change in _____ when object is heated or cooled.

    (a)

    length

    (b)

    area

    (c)

    volume

    (d)

    density

  4. ૪ rays are ________ in charge.

    (a)

    positive

    (b)

    negative

    (c)

    neutral

    (d)

    none

  5. The gram molecular mass of oxygen molecule is

    (a)

    16 g

    (b)

    18 g

    (c)

    32 g

    (d)

    17 g

  6. The process of extracting the ore from the earth's crust is ____________

    (a)

    Metallurgy

    (b)

    Mining

    (c)

    Smelting

    (d)

    Leaching

  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. Chloroplasts are ___________ shaped organelles.

    (a)

    disc

    (b)

    round

    (c)

    oval

    (d)

    circle

  9. In leech locomotion is performed by

    (a)

    Anterior sucker

    (b)

    Posterior sucker

    (c)

    Setae

    (d)

    None of the above

  10. The axons may be covered by a protective sheath called ______

    (a)

    Myelin

    (b)

    Nodes of ranvier

    (c)

    Schwann cells

    (d)

    Nissl's granules

  11. Paleontologists deal with

    (a)

    Embryological evidences

    (b)

    Fossil evidences

    (c)

    Vestigial organ evidences

    (d)

    All the above

  12. Where you will create category of blocks?

    (a)

    Block palette

    (b)

    Block menu

    (c)

    Script area

    (d)

    sprite

  13. Part II

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

    10 x 2 = 20
  14. State Newton’s second law.

  15. An electrician puts a fuse of rating 5 A in that part of domestic electrical circuit in which an electrical heater of rating 1.5 kW, 220V is operating. What is likely to happen in this case and why? What change, if any needs to be made?

  16. What is the audible range of frequency?

  17. What is Molar volume of a gas?

  18. Define Volume percentage

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

  20. Why is the teeth of rabbit called heterodont?

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

  22. What is adult onset diabetes?

  23. What is Sprite?

  24. Part III

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

    10 x 4 = 40
  25. Explain the construction of Simple Microscope and derive its magnification power.

  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. Give the balanced chemical equation of the following reactions:
    (i) Neutralization of NaOH with ethanoic acid.
    (ii) Evolution of carbon dioxide by the action of ethanoic acid with NaHCO3.
    (iii) Oxidation of ethanol by acidified potassium dichromate.
    (iv) Combustion of ethanol.

  29. What is the importance of valves in the heart?

  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. The degenerated wing of a kiwi is an acquired character. Why is it an acquired character?

  32. Name two maize hybrids rich in amino acid lysine.

  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. “Wearing helmet and fastening the seat belt is highly recommended for safe journey” Justify your answer using Newton’s laws of motion.

  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. Describe mutation breeding with an example.

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