IX STD Model Question

9th Standard

    Reg.No. :
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Science

Time : 02:30:00 Hrs
Total Marks : 60

    I. Choose the best answer 

    10 x 1 = 10
  1. Clouds float in atmosphere because of their low

    (a)

    density

    (b)

    pressure

    (c)

    velocity

    (d)

    mass

  2. The speeds of sound in four different media are given below. Which of the following is the most likely speed in m s-1 with which the two under water whales in a sea can talk to each other when separated by a large distance?

    (a)

    5170

    (b)

    1280

    (c)

    340

    (d)

    1530

  3. Ceres is a _______.

    (a)

    Meteor

    (b)

    Star

    (c)

    Planet

    (d)

    Astroid

  4. A phenomenon in which an element exists in different modification in same physical state is called

    (a)

    Isomerism

    (b)

    Allotropy

    (c)

    Catenation

    (d)

    Crystallinity

  5. Diamond is not a good conductor of electricity because

    (a)

    it is very hard

    (b)

    it has no free electron

    (c)

    its structure is uniform

    (d)

    it is insoluble in water

  6. Chlorinated hydrocarbons are used as

    (a)

    fertilizers

    (b)

    pesticides

    (c)

    food colourants

    (d)

    preservatives

  7. Which of the following is not an adaptation of hydrophytes?

    (a)

    poorly developed root system

    (b)

    reduced plant body

    (c)

    water storing parenchymatous tissues

    (d)

    finely divided submerged leaves

  8. Binomial name of Nilavembu is

    (a)

    Leucas aspera

    (b)

    Andrographis paniculata

    (c)

    Crotolaria juncea

    (d)

    Cassia fistula

  9. The major constituent of vinegar is

    (a)

    citric acid

    (b)

    acetic acid

    (c)

    oxalic acid

    (d)

    hydrochloric acid

  10. _________is an Operating System.

    (a)

    Android

    (b)

    Chrome

    (c)

    Internet

    (d)

    Pendrive

  11. II. Answer any 15 questions in the following :

    15 x 2 = 30
  12. Define orbital velocity.

  13. Define time period of a satellite.

  14. How many valence electrons are there in carbon?

  15. What is the need for chemical fertilizers in crop fields?

  16. Define Compost

  17. Differentiate Pollen and Nectar

  18. Differentiate Farmyard manure and Sheep manure

  19. Define the Bacteriophages

  20. Assertion: To float, body must displace liquid whose weight is equal to the actual weight.
    Reason: The body will experience no net downward force in that case.
    (a) If both assertion and reason are true and reason is the correct explanation of assertion.
    (b) If both assertion and reason are true but reason is not the correct explanation of assertion.
    (c ) If assertion is true but reason is false.
    (d) If assertion is false but reason is true.

  21. Assertion: Wide wooden sleepers are kept below railway lines to reduce pressure on the railway tracks and prevent them from sinking in the ground.
    Reason: Pressure is directly proportional to the area in which it is acting.
    (a) If both assertion and reason are true and reason is the correct explanation of assertion.
    (b) If both assertion and reason are true but reason is not the correct explanation of assertion.
    (c) If assertion is true but reason is false.
    (d) If assertion is false but reason is true.

  22. On what factors the pressure exerted by the liquid depends on?

  23. Why does a helium balloon float in air?

  24. Through which medium sound travels faster, iron or water? Give reason.

  25. Can sound travel through vacuum?

  26. Write about comets in brief.

  27. Carbon do not form ionic compounds. Why?

  28. What is IUCN? What is the vision of IUCN?

  29. Mention any two mushroom preservation methods.

  30. A baby is suffering from diarrhoea, while other babies in the same locality do not. Mention the possible causes that you think. What would be the possible solutions for this?

  31. III.Answer all the questions 

    4 x 5 = 20
    1. Why does a boat with a hole in the bottom would eventually sink?

    2. Verify experimentally the laws reflection of sound.

    1. Write a note on orbital velocity

    2. Why do carbon exist mostly in combined state?

    1. Draw the cell diagram of Daniel cell. Give its reactions.

    2. What is water recycling? Explain the conventional wastewater recycling treatment?

    1. Write short notes on;
      a) Importance of green houses
      b) Uzahavan mobile Application
      c) Major floriculture zones
      d) Azospirillum

    2. Name the causative agent of typhoid in human. How does the pathogen gain entry into the human body? Write the diagnostic symptoms and mention the organ that is affected in severe cases.

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