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Model Question Paper Part - II

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. 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. Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens

    (a)

    f

    (b)

    2f

    (c)

    infinity

    (d)

    between f and 2f

  3. In which process heat is transferred directly from one molecule to other?

    (a)

    conduction

    (b)

    convection

    (c)

    Radiation

    (d)

    all the above

  4. Radio __________ is used in the treatment of skin diseases

    (a)

    iron

    (b)

    phosphorous

    (c)

    sodium

    (d)

    iodine

  5. 1 mole of any substance contains __________ molecules

    (a)

    6.023 × 1023

    (b)

    6.023 × 1023

    (c)

    3.0115 × 1023

    (d)

    12.046 × 1023

  6. Which among the following are the ores of aluminium?
    (i) Bauxite
    (ii) Cryolite
    (iii) Corundum.

    (a)

    Both (i) and (ii)

    (b)

    Only

    (c)

    Only (iii)

    (d)

    (i), (ii) and (iii)

  7. Which of the following is the universal solvent?

    (a)

    Acetone

    (b)

    Benzene

    (c)

    Water

    (d)

    Alcohol

  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. _____ is the longest cell of the human body.

    (a)

    Neuron

    (b)

    Neuroglia

    (c)

    Nerve fibres

    (d)

    Cyton

  11. The term Ethnobotany was coined by

    (a)

    Khorana

    (b)

    J.W. Harsbberger

    (c)

    Ronald Ross

    (d)

    Hugo de Vries

  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. Why a spanner with a long handle is preferred to tighten screws in heavy vehicles?

  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 minimum distance needed for an echo?

  17. Give any two examples for heterodiatomic molecules.

  18. What is mean by binary solution

  19. Raman went to a garden. He saw that the stem of the Banyan tree becomes thicker every year whereas such a change is not seen in a coconut tree. Can you give a explanation for this.

  20. Why is the teeth of rabbit called heterodont?

  21. What is Paleobotany?

  22. Mention the diseases caused by tobacco smoke.  

  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. 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 principle & structure of atom bomb.

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

  29. What is cohesion?

  30. Write a note on DNA replication.

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

  32. Differentiate between outbreeding and inbreeding.

  33. What is diabetes? Explain the types.

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

  35. Part IV

    Answer all the questions.

    6 x 7 = 42
  36. A heavy truck and bike are moving with the same kinetic energy. If the mass of the truck is four times that of the bike, then calculate the ratio of their momenta. (Ratio of momenta = 1:2

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

  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. 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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