47. Which of the following is the correct order of the planets of the solar system in terms of their increasing distance
    from the sun?
    (a) Neptune – Venus – Earth – Mercury – Saturn – Uranus – Mars – Jupiter
    (b) Mercury – Saturn – Uranus – Neptune – Venus – Earth – Mars – Jupiter
    (c) Mercury – Venus – Earth – Mars – Jupiter – Saturn – Uranus – Neptune
    (d) Mercury – Saturn – Earth – Uranus – Neptune – Venus– Mars – Jupiter
Ans: (c)
48. Which of the following is NOT an inner planet?
    (a) Venus
    (b) Saturn
    (c) Earth
    (d) Mars
Ans: (b)
49. Which of the following is NOT an outer planet?
    (a) Jupiter
    (b) Uranus
    (c) Mars
    (d) Neptune
Ans: (c)
50. Which of the following is not TRUE about inner planets?
    (a) They are also called as Terrestrial planets.
    (b) They have greater density.
    (c) They orbit the Sun quickly.
    (d) They spin quickly.
Ans: (d)
51. Which of the following is not TRUE about outer planets?
    (a) They are also called as Gas giants or Jovian.
    (b) They have smaller density.
    (c) They have lots of moons.
    (d) These planets are quite solid and are made up of rock and metals.
Ans: (d)
52. What is the value of escape velocity on the moon"s surface?
      (a) 1.4 km/sec
      (b) 2.4 km/sec
      (c) 9.8 km/sec
      (d) 11.2 km/sec
Ans: (b)
53. Which of the following astronaut is landed or stepped down first on the surface of moon?
      (a) Denial Pearl
      (b) Neil Armstrong
      (c) Uri Gagarin
      (d) None of these
                                                          672