MODEL QUARTERLY EXAMINATION QUESTION PAPERSEPTEMBER 2019

10th Standard EM

    Reg.No. :
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Science

USE BLUE INK ONLY


Time : 02:30:00 Hrs
Total Marks : 75
    ANSWER ALL THE QUESTIONS. EACH QUESTION CARRIES ONE MARK.
    12 x 1 = 12
  1. The unit of ‘g’ is m s-2. It can be also expressed as

    (a)

    cm s-1

    (b)

    N kg-1

    (c)

    N m2 kg-1

    (d)

    cm2 s-2

  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. The value of universal gas constant

    (a)

    3.81 mol–1 K–1

    (b)

    8.03 mol–1 K–1

    (c)

    1.38 mol–1 K–1

    (d)

    8.31 mol–1 K–1

  4. Which of the following represents 1 amu?

    (a)

    Mass of a C – 12 atom

    (b)

    Mass of a hydrogen atom

    (c)

    1/12th of the mass of a C – 12 atom

    (d)

    Mass of O – 16 atom

  5. Which of the following have inert gases 2 electrons in the outermost shell

    (a)

    He

    (b)

    Ne

    (c)

    Ar

    (d)

    Kr

  6. Which of the following is hygroscopic in nature?

    (a)

    ferric chloride

    (b)

    copper sulphate penta hydrate

    (c)

    silica gel

    (d)

    none of the above

  7. Which is formed during anaerobic respiration

    (a)

    Carbohydrate

    (b)

    Ethyl alcohol

    (c)

    Acetyl CoA

    (d)

    Pyruvate

  8. Mammals are ______________ animals.

    (a)

    Cold blooded

    (b)

    Warm blooded

    (c)

    Poikilothermic

    (d)

    All the above

  9. Which one of the following regarding blood composition is correct

    (a)

    Plasma - Blood + Lymphocyte

    (b)

    Serum - Blood + Fibrinogen

    (c)

    Lymph - Plasma + RBC + WBC

    (d)

    Blood - Plasma + RBC+ WBC +Platelets

  10. Nerve cells do not possess

    (a)

    neurilemma

    (b)

    sarcolemma

    (c)

    axon

    (d)

    dendrites

  11. To increase the sugar production in sugarcanes they are sprayed with _______

    (a)

    Auxin

    (b)

    Cytokinin

    (c)

    Gibberellins

    (d)

    Ethylene

  12. Syngamy results in the formation of____________

    (a)

    Zoospores

    (b)

    Conidia

    (c)

    Conidia

    (d)

    Chlamydospores

  13. ANSWER ANY 7 QUESTIONS ONLY. QUESTION NO. 22 IS COMPULSORY
    10 x 2 = 20
  14. Define dispersion of light

  15. What is co-efficient of apparant expansion?

  16. Give any two examples for heterodiatomic molecules.

  17. State two conditions necessary for rusting of iron.

  18. Define the term: Solution

  19. Name the phenomenon by which carbohydrates are oxidized to release ethyl alcohol.

  20. What is the shape of RBC in human blood?

  21. Which hormone induces parthenocarpy in tomatoes?

  22. When is World Menstrual Hygiene Day observed?

  23. Weight of a person inside the lift while at rest is 50 N. What is the weight he feels when lift
    moves up with an acceleration of 9.8 ms-2.

  24. ANSWER ANY 7 QUESTIONS ONLY. QUESTION NO. 32 IS COMPULSORY

    10 x 4 = 40
  25. Two bodies have a mass ratio of 3:4 The force applied on the bigger mass produces an acceleration of 12 ms-2.What could be the acceleration of the other body, if the same force acts on it.

  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. Calculate the % of oxygen in Al2(SO4)3. (Atomic mass: Al-12, O-16, S -32)

  28. The electronic configuration of metal A is 2,8,18,1.
    The metal A when exposed to air and moisture forms B a green layered compound. A with con. H2SO4 forms C and D along with water. D is a gaseous compound. Find A,B,C and D.

  29. a) What happens when MgSO4.7H2O is heated? Write the appropriate equation
    b) Define solubility

  30. Leeches do not have secretion of digestive juices and enzymes -Why ?

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

  32. Medullated and non-medullated nerve fibre.

  33. What are chemical messengers?

  34. How will you determine the atomicity of gases using Avogadro's hypothesis?

  35. ANSWER ALL THE THREE QUESTONS. 
    3 x 7 = 21
  36. Deduce the equation of a force using Newton’s second law of motion.

  37. List any five properties of light.

  38. 1.Calcium carbonate is decomposed on heating in the following reaction
    CaCO3 → CaO + CO2
    i. How many moles of Calcium carbonate are involved in this reaction?
    ii. Calculate the gram molecular mass of calcium carbonate involved in this reaction
    iii. How many moles of CO2 are there in this equation?

  39. '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

  40. Illustrate the structure and functions of brain.

  41. In angiosperms the pollen germinates to produce pollen tube that carries two gametes. What is the purpose of carrying two gametes when single gamete can fertilize the egg?

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