Universe Book Back Questions

9th Standard

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    3 x 1 = 3
  1. Who proposed the heliocentric model of the universe?

    (a)

    Tycho Brahe

    (b)

    Nicolaus Copernicus

    (c)

    Ptolemy

    (d)

    Archimedes

  2. 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

  3. The Big Bang occurred ________ years ago.

    (a)

    13.7 billion

    (b)

    15 million

    (c)

    15 billion

    (d)

    20 million

  4. 3 x 1 = 3
  5. The speed of Sun in km/s is _______.

    ()

    ~ 200 krn/s

  6. India’s first satellite is _______.

    ()

    Aryabhatta

  7. The number of planets in our Solar System is _______.

    ()

    8

  8. 3 x 1 = 3
  9. The distance between Saturn and Uranus is about 10 times as that between Earth and Mars.

    (a) True
    (b) False
  10. Halley’s comet appears after nearly 67 hours.

    (a) True
    (b) False
  11. Mars is called the red planet.

    (a) True
    (b) False
  12. 5 x 1 = 5
  13. Jupiter

  14. (1)

    243 days

  15. Mercury

  16. (2)

    10.7 hours

  17. Venus

  18. (3)

    87.97 days

  19. Saturn

  20. (4)

    9 hours 55 min

  21. Mars

  22. (5)

    24 hours 37 min

    2 x 2 = 4
  23. Why do some stars appear blue and some red?

  24. How is a satellite maintained in nearly circular orbit?

  25. 2 x 2 = 4
  26. What is solar system?

  27. Define orbital velocity.

  28. 1 x 3 = 3
  29. State Kepler’s laws.

  30. 1 x 5 = 5
  31. Discuss the benefits of ISS.

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