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    Class10 Science

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    lalan jha

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    © All Rights Reserved
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    Class10 Science

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    Class10 Science

    Uploaded by

    lalan jha

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    © All Rights Reserved
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    L.

    DYNAMIC PUBLIC ACADEMY


    LAXMINIYA BAZAAR
    Third Terminal 2079
    Class: 10 Full Marks: 75
    Time: 2:15 hrs. Subject: Science Pass Marks: 30
    Attempt all questions
    GROUP 'A' [15x1=15]
    1. Give short answer to the following questions.
    a. On which factors does gravitation between any two bodies
    depend?
    b. What is upthrust?
    c. What is alternative sources of energy?
    d. What does it mean by the statement that specific heat
    capacity of a body is 150 J/Kg°C?
    e. What is meant by power of lens?
    f. What is periodic table?
    g. Define exothermic reaction.
    h. What is an acid?
    i. Name two chemicals required for the preparation of NH3 gas
    in laboratory.
    j. How many chromosomes are there in each of
    somatic cell and gamete of a drone bee?
    k. What is an endocrine gland?
    l. What is meant by sex determination?
    m. Name any two organisms which reproduce by
    fragmentation.
    n. Define variation in the organisms.
    o. What are fossils?
    GROUP 'B' [13x2=26]
    2. A student uses spectacles of power + 1.5D. What is the type of
    defect in his eyes? Calculate the focal length of the lens used?
    3. A ship can carry heavier load in salty water than that in fresh
    water, why?
    4. Write any two differences between ordinary mercury
    thermometer and maximum-minimum thermometer.
    5. Why is alternating current more useful than the direct current? body.
    Give any two reasons. GROUP 'D' [4x4=16]
    6. Why is CO2 gas used for extinguishing fire? 21. Observe the adjoining diagram to
    7. Gold is found in pure state in nature but not iron, why? answer the questions given.
    8. Write structural formula of glycerol and its one use. a. What type of transformer is it?
    9. Why is detergent called soap less soap? b. Calculate the output voltage of
    10. Write two differences between auricles and ventricles. the transformer.
    11. Write two functions of cerebellum. c. Where is this type of transformer used? Give an example.
    12. Write two similarities between queen bee and worker bee. 22. Write two chemical properties of bases. Write
    13. How is environmental pollution different from environmental the balanced chemical equation of the reaction between strong
    management? base and weak acid. Also write the type of salt formed by the
    14. Identify the following masses as asteroid, satellite, comet or reaction.
    galaxy. 23. Draw a chart to show the offspring’s produced in F1 and F2
    a. Enke (b) Titan (c) Andromeda (d) Juno generations after the cross between pea plants with pure red
    GROUP 'C' [6x3=18] flower and pure white flower. Write phenotypic and genotypic
    15. If the acceleration due to gravity on the surface of the earth is ratio of F2 generation.
    9.8 m/s2, calculate the acceleration due to gravity at the top of 24. How do these factors help in climate change? Explain in brief.
    Mt. Everest. Also, find the weight of a stone of mass 50 kg at (a) Deforestation (b) Releases of greenhouse gases
    the top of Mt. Everest. (Radius of the earth = 6400 km and height
    of Mt. Everest 8848 m) *****
    16. The weights of a piece of stone in three different media air, water
    and salt solution are given in the table. Answer the following
    questions by studying the given table. Medium Weight
    a. Identify air and salt solution A 14 N
    among A, B and C? B 12 N
    b. If the weight of 1 Kg mass in air C 16 N
    is 10N, then what will be the mass of the stone?
    c. Calculate the up thrust exerted by salt water solution.
    17. Write three features of Mendeleev's periodic table.
    18. a. What happens when potassium chlorate is heated?
    b. How does the concentration of the reactants affect the rate of
    chemical reaction?
    19. Write three advantages of sexual reproduction.
    20. Mention three symptoms of increased level of uric acid in human

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