9th Science - Sound and Universe Complete Material

9th Standard

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Science

Time : 02:00:00 Hrs
Total Marks : 100
    15 x 1 = 15
  1. Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?

    (a)

    stretched strings

    (b)

    stretched membranes

    (c)

    air columns

    (d)

    metal plates

  2. Sound travels in air:

    (a)

    if there is no moisture in the atmosphere.

    (b)

    if particles of medium travel from one place to another.

    (c)

    if both particles as well as disturbance move from one place to another.

    (d)

    if disturbance moves.

  3. A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through

    (a)

    wax

    (b)

    vacuum

    (c)

    water

    (d)

    empty vessel

  4. If the speed of a wave is 340 m s-1 and its frequency is 1700 Hz, then wavelength λ for this wave in cm will be

    (a)

    34

    (b)

    20

    (c)

    15

    (d)

    0.2

  5. Which of the following statement best describes frequency?

    (a)

    the number of complete vibrations per second.

    (b)

    the distance travelled by a wave per second.

    (c)

    the distance between one crest of wave and the next one.

    (d)

    the maximum disturbance caused by a wave.

  6. The maximum speed of vibrations which produces audible sound will be in

    (a)

    seawater

    (b)

    ground glass

    (c)

    dry air

    (d)

    Human blood

  7. The sound waves travel faster

    (a)

    in liquids

    (b)

    in gases

    (c)

    in solids

    (d)

    in vacuum

  8. When the pitch of note by a harmonium is lowered, then the wave length of the note

    (a)

    first decreases and then increases

    (b)

    decreases

    (c)

    remains the same

    (d)

    increases

  9. Which of the following can produce longitudinal waves as well as transverse waves under different conditions?

    (a)

    TV transmitter

    (b)

    tuning fork

    (c)

    water

    (d)

    slinky

  10. The velocities of sound waves in four media P, O, Q, R and S are 18,00 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which could be a liquid medium?

    (a)

    R

    (b)

    Q

    (c)

    P

    (d)

    S

  11. Who proposed the heliocentric model of the universe?

    (a)

    Tycho Brahe

    (b)

    Nicolaus Copernicus

    (c)

    Ptolemy

    (d)

    Archimedes

  12. Which of the following is not a part of outer solar system?

    (a)

    Mercury

    (b)

    Saturn

    (c)

    Uranus

    (d)

    Neptune

  13. Ceres is a _______.

    (a)

    Meteor

    (b)

    Star

    (c)

    Planet

    (d)

    Astroid

  14. The period of revolution of planet A around the Sun is 8 times that of planet B. How many times is the distance of planet A as great as that of planet B?

    (a)

    4

    (b)

    5

    (c)

    2

    (d)

    3

  15. The Big Bang occurred ________ years ago.

    (a)

    13.7 billion

    (b)

    15 million

    (c)

    15 billion

    (d)

    20 million

  16. 5 x 1 = 5
  17. Vibration of object produces_________.

    ()

    sound

  18. The velocity of sound in solid is ____________ than the velocity of sound in air.

    ()

    faster

  19. A sound wave has a frequency of 4 k hz and wavelength 2 m. Then the velocity of sound is ____________ .

    ()

    800 m/s or 8000 rns-1

  20. The rotational period of the Sun near its poles is ________.

    ()

    About 36 days

  21. The third law of Kepler is also known as the Law of ________.

    ()

    The law of. hormonles

  22. 5 x 2 = 10
  23. What is solar system?

  24. What is a cosmic year?

  25. Define orbital velocity.

  26. Define time period of a satellite.

  27. What is a satellite? What are the two types of satellites?

  28. 15 x 3 = 45
  29. Name the device which is used to produce sound in laboratory experiments.

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

  31. What should an object do to produce sound?

  32. Can sound travel through vacuum?

  33. Name the physical quantity whose SI unit is ‘hertz’. Define.

  34. What is meant by supersonic speed?

  35. How does the sound produced by a vibrating object in a medium reach your ears?

  36. The frequency of a source of sound is 600 Hz. How many times does it vibrate in a minute?

  37. A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. When is the splash heard at the top?
    (Given g = 10 m s–2 and speed of sound = 340 m s–1)

  38. Write a note on the inner planets

  39. Write about comets in brief.

  40. State Kepler’s laws.

  41. Write short notes on Gaganyaan

  42. What factors have made life on Earth possible?

  43. At an orbital height of 400 km, find the orbital period of the satellite.

  44. 5 x 5 = 25
  45. Verify experimentally the laws reflection of sound.

  46. List the applications of sound.

  47. Explain the working of human ear with diagram.

  48. Give an account of all the planets in the solar system.

  49. Write a note on orbital velocity

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