Astronomy (Objective) (Pages :11)

  • 31 The system of astronomy based on Heliocentre (sun centred) universe was presented by?

    Ans : Copernicus
  • 32 The astronomer who presented the system of astronomy based on a geo centric (earth centred) universe?

    Ans : Ptolemy
  • 33 The first who attempted to measure stellar distances?

    Ans : James Gregory
  • 34 The length of an Earth day is determined by the time required for approximately one?

    Ans : Earth rotation
  • 35 The apparent rising and setting of the Sun, as viewed from Earth, is caused by?

    Ans : Earth’s rotation
  • 36 The apparent daily path of the Sun changes with the seasons because?

    Ans : Earth's axis is tilted
  • 37 An inter stellar cloud of dust, hydrogen, helium and other ionized gases are called?

    Ans : Pulsars
  • 38 First pulsar was discovered by?

    Ans : Jacelyn Bell
  • 39 The pieces of rocks, which move around the sun are called?

    Ans : Meteoroids
  • 40 The tilt of the Earth on its axis is a cause of the Earth’s?

    Ans : changing length of day and night
  • 41 Compared to the distances between the planets of our solar system, the distances between stars are usually?

    Ans : much greater
  • 42 Why does the moon appear to move across the sky during the night?

    Ans : Earth rotates on its axis.
  • 43 What time of year is the sun farthest from the earth?

    Ans : Summer in the Northern Hemisphere.
  • 44 As per Microwave Anisotropy Probe (MAP) what is the exact age of the universe?

    Ans : 13.7 billion year after the theoretical Big Bang
  • 45 Name the British astronomer who, told that the Universe was not limited to the solar system, but is much vaster than that?

    Ans : Sir William Herschel
  • 46 Stars whose brightness increases to 20 magnitude or more due to explosion in the star is called?

    Ans : Supernovae
  • 47 What is a star?

    Ans : A star is a gaseous self-luminous body in space
  • 48 What is a parsec?

    Ans : The word "parsec" is made up of the parts of the words "parallax" and "second". It means the distance from the Earth to a star whose parallax is one second of arc.
  • 49 What does magnitude mean?

    Ans : Magnitude is the measure of the brightness of a star or of any luminous body in the heaven
  • 50 When the hydrogen in a star is depleted, its outer regions swell and redden such stars are called?

    Ans : Red giants
  • 51 The brightest star is?

    Ans : Taurus
  • 52 What does the colour of the star signify?

    (A) The blue and the white stars are the hottest
    (B) while the red stars are cooler stars.

    Ans :()

  • 53 What are variable stars?

    (A) Variable stars are stars whose brightness is not constant
    (B) but whose light changes from time to time.

    Ans :()

  • 54 Which star is not seen to change its position in the sky?

    Ans : Pole star
  • 55 What are called as lighthouses in the sky?

    Ans : Neutron stars
  • 56 What is the colour of the young stars in the sky?

    Ans : Blue
  • 57 Where is the highest altitude of the star Polaris be observed?

    Ans : Arctic Circle
  • 58 Which star is cooler and many times brighter than Earth’s Sun?

    Ans : Betelgeuse
  • 59 Which is the brightest nebula visible in the night sky?

    Ans : The Orion Nebula
  • 60 Name the nebula, a cloud of dust and gases 5,000 light years away from Earth, where the coldest places in the Universe can be found?

    Ans : The Boomerang Nebula. The “cold spot” has a temperature of -2730C (457.60F)

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